CN105811227B - A kind of super flat super continuous spectrums laser acquisition methods of femtosecond - Google Patents
A kind of super flat super continuous spectrums laser acquisition methods of femtosecond Download PDFInfo
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- CN105811227B CN105811227B CN201610307174.1A CN201610307174A CN105811227B CN 105811227 B CN105811227 B CN 105811227B CN 201610307174 A CN201610307174 A CN 201610307174A CN 105811227 B CN105811227 B CN 105811227B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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- Optics & Photonics (AREA)
- Automation & Control Theory (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of super flat super continuous spectrums laser acquisition methods of femtosecond, this method is realized on the super continuous spectrums laser of super flat spectrum output.This method include wavelength selection, seed laser generate, seed laser power amplification, laser compression and amplify again, super continuous spectrums generate and monitoring, seed laser power automatic adjusument.The beneficial effects of the invention are as follows, by the way of a kind of pumping of reaction type amplitude modulation multiwavelength laser, in conjunction with wide spectrum spectrum monitoring, the intensity of multi wavelength pumping laser is adaptively adjusted, the super continuous spectrums laser output that high output spectrum flatness and stability are realized by superposition, meets the needs of precision wide spectrum quantitative analysis.
Description
Technical field
The present invention relates to a kind of pulse laser generation methods, more particularly to a kind of reaction type amplitude modulation multiwavelength laser that is based on to pump
The super flat super continuous spectrums laser acquisition methods of the femtosecond at Pu.
Background technique
Super continuous spectrums laser refer to when pumping laser pass through special optical waveguide when, a series of nonlinear effect causes incidence
The spectrum widening of laser beam, to export wide spectrum laser beam-title super continuous spectrums.Especially as ultrafast laser and photonic crystal
The development of optical fiber (Photonic crystal fibers, abbreviation PCF) technology, is produced using propagation of the ultrashort pulse in PCF
Raw super continuum light has become the noticeable project in the whole world.This technology only needs low-down pulse energy (about
Super continuum light can 1nJ) be generated, and obtained super continuum light is relevant and brightness is high --- this makes it ideal
White light source.
Super continuous spectrums laser has been rapidly developed since birth, especially in terms of spectral region, is covered substantially
Infrared spectral coverage has been covered from ultraviolet in.In addition, also achieving huge progress in terms of high-power and device miniaturization.
However, current super continuous laser source can not in some applications for needing to refine wide spectrum quantitative analysis
It is competent, because existing super continuous spectrums laser source is asked in the technical indicators such as output spectrum flatness and stability there are some
Topic can not adapt to the requirement of wide range accurate quantification analysis.Therefore, the super company of high output spectrum flatness and stability how is realized
Continuous spectrum laser is a urgent need to solve the problem.
Summary of the invention
The purpose of the present invention is to provide a kind of realities of the super continuous spectrums laser of high output spectrum flatness and stability
Existing method, its mode based on the pumping of reaction type amplitude modulation multiwavelength laser can meet the needs of precision wide spectrum quantitative analysis.
The technical scheme is that be achieved in, high output spectrum flatness and stability proposed by the present invention
Super continuous spectrums laser is made of controller, pumping source mould group, ring laser mould group and supercontinuum generation and monitoring mould group.
Pumping source mould group is used to generate the multi-Wavelength Pulses seed laser of loop laser device assembly.It includes power regulation
Device, the first impulse generator, the first shaping amplifier, first laser tube drive circuit, the second impulse generator, the second shaping are put
Big device, second laser tube drive circuit, third impulse generator, third shaping amplifier, third laser tube drive circuit, three close
One optical fiber, the first Polarization Controller and optoisolator；Wherein first laser tube drive circuit by the first field-effect tube driving circuit,
First field-effect tube and first laser diode and its discharge loop composition；Similarly, second laser tube drive circuit is by second
Field-effect tube driving circuit, the second field-effect tube and second laser diode and its discharge loop composition；The driving of third laser tube
Circuit is made of third field-effect tube driving circuit, third field-effect tube and third laser diode and its discharge loop；Power
Adjuster is used to amplify the first shaping amplifier, the second shaping amplifier, third shaping amplifier the adjusting of multiple.
Ring laser mould group include the first semiconductor laser, the second semiconductor laser, third semiconductor laser,
Four-in-one photo-coupler, annular chamber, the first negative GVD optical fiber, the first wavelength division multiplexer, ytterbium doped optical fiber amplifier, the second wavelength-division are multiple
With device, the second negative GVD optical fiber, the second Polarization Controller, third Polarization Controller, Faraday isolator and the 4th Polarization Control
Device, the multi-Wavelength Pulses seed laser for sending to pumping source mould group carry out power amplification and pulse mode-locked compression.
Supercontinuum generation and monitoring mould group include PCF coupler, PCF, one-in-and-two-out optical fiber, output interface and wide range
Section spectrometer carries out real-time monitoring for generating super continuous spectrums pulse laser, while to its spectral characteristic, and monitoring result is anti-
It feeds controller.
Controller contains the hardware circuit and software systems for executing control with data analysis, swashs for controlling the first semiconductor
Light device, the second semiconductor laser, third semiconductor laser, the first impulse generator, the second impulse generator, third pulse
Generator, power governor and wide spectrum spectrometer, and the output spectrum signal for receiving wide spectrum spectrometer carries out spectroscopic data
Analysis.
The super flat spectrum of super continuous spectrums laser exports and high stable characteristic is realized according to the following steps:
(1) according to the zero-dispersion wavelength λ of PCF0, find out its corresponding frequency f0；Setpoint frequency difference Δ f, setpoint frequency f1=
f0+ Δ f finds out its corresponding wavelength X1；Similarly, setpoint frequency f2=f0Δ f finds out its corresponding wavelength X2；
(2) select the operation wavelength of first laser diode and the first semiconductor laser for λ0；Select second laser two
Pole pipe and the operation wavelength of the second semiconductor laser are λ1；Select the work of third laser diode and third semiconductor laser
Making wavelength is λ2；
(3) controller sending control instruction gives the first impulse generator, the second impulse generator and third impulse generator,
The pulse frequency of three is set as identical value and is allowed to start work；
(4) controller issues control instruction starting the first semiconductor laser, the second semiconductor laser, third semiconductor
Laser, wide spectrum spectrometer；
(5) controller issues control instruction to power governor, and power governor is by the first shaping amplifier, the second shaping
One identical initial value A of amplification factor setting of amplifier, third shaping amplifier1=A2=A3；
The high frequency electric pulse that (6) first impulse generators issue carries out shaping pulse through the first shaping amplifier first, adjusts
High level duty ratio is saved, the high frequency electric pulse of nanosecond is formed, then presses A1After multiple carries out power amplification, it is sent into first laser
The control pin of the field-effect tube driving chip in the first field-effect tube driving circuit in tube drive circuit, field-effect tube driving
The nanosecond pulse signal that the output pin of chip generates high frequency be used to control the first field-effect tube of high-speed high-power conducting and
Cut-off makes first laser diode generate the nanosecond of high frequency for controlling the charge and discharge in first laser diode discharge circuit
Pulse seed laser；
Similarly, it is whole that the high frequency electric pulse that the second impulse generator issues carries out pulse through the second shaping amplifier first
Shape adjusts high level duty ratio, forms the high frequency electric pulse of nanosecond, then presses A2After multiple carries out power amplification, it is sent into the
The control pin of the field-effect tube driving chip in the second field-effect tube driving circuit in dual-laser tube drive circuit, field-effect
The output pin of pipe driving chip generates high frequency nanosecond pulse signal for controlling leading for the second field-effect tube of high-speed high-power
Logical and cut-off makes second laser diode generate high frequency nanosecond for controlling the charge and discharge in second laser diode discharge circuit
Grade pulse seed laser；
Similarly, it is whole that the high frequency electric pulse that third impulse generator issues carries out pulse through third shaping amplifier first
Shape adjusts high level duty ratio, forms the high frequency electric pulse of nanosecond, then presses A3After multiple carries out power amplification, it is sent into the
The control pin of the field-effect tube driving chip in third field-effect tube driving circuit in three laser tube drive circuits, field-effect
The output pin of pipe driving chip generates the nanosecond pulse signal of high frequency for controlling high-speed high-power third field-effect tube
On and off makes third laser diode generate high frequency for controlling the charge and discharge of third laser diode discharge loop
Nanosecond pulse seed laser；
(7) three beams wavelength is respectively λ0、λ1、λ2Pulse seed laser through in three-in-one fiber coupling entering light fibre, then through the
One Polarization Controller and optoisolator are transferred into ring laser mould group.The effect of first Polarization Controller and optoisolator is
Eliminate the issuable echo interference of ring laser mould group；
(8) the first semiconductor laser in ring laser mould group, the wavelength of transmitting are λ0Continuous pump laser beam warp
It crosses after two equal part of four-in-one photo-coupler and annular chamber is entered with both direction, pass through the first wavelength division multiplexer and the second wavelength-division respectively
After multiplexer, ytterbium doped optical fiber amplifier is pumped from both direction.The wavelength of pumping source mould group output is λ0Nanosecond pulse
Seed laser carries out power amplification by ytterbium doped optical fiber amplifier, while the nanosecond pulse laser first passes through the first negative GVD light
Fibre, pulse are compressed, since ytterbium doped optical fiber amplifier has positive GVD, so the nanosecond pulse have passed through stretching, using
After second negative GVD optical fiber, pulse has obtained second compression again, and chirp (chirp) compensation is carried out in annular chamber.Third Polarization Control
Device, Faraday isolator and the 4th Polarization Controller form a resonator, using nonlinear polarization rotation, formed etc.
Saturable absorber is imitated, the nonlinear birefringence effect in optical fiber is recycled, based on the self-locking mode in nonlinear birefringence optical fiber
Mechanism generates ultrashort femtosecond laser pulse, and makes the laser in annular chamber along one-way transmission, defeated by the second Polarization Controller
High-power wavelength is λ out0Femtosecond pulsed laser to supercontinuum generation and monitoring mould group；
Meanwhile the second semiconductor laser in ring laser mould group, the wavelength of transmitting are λ1Continuous pump laser beam
Annular chamber is entered with both direction after two equal part of four-in-one photo-coupler, passes through the first wavelength division multiplexer and the second wave respectively
After division multiplexer, ytterbium doped optical fiber amplifier is pumped from both direction.The wavelength of pumping source mould group output is λ1Nanosecond arteries and veins
It rushes seed laser and carries out power amplification by ytterbium doped optical fiber amplifier, while the nanosecond pulse laser first passes through the first negative GVD
Optical fiber, pulse are compressed, and since ytterbium doped optical fiber amplifier has positive GVD, so the nanosecond pulse have passed through stretching, then are passed through
After crossing the second negative GVD optical fiber, pulse has obtained second compression again, and chirp (chirp) compensation is carried out in annular chamber.Based on non-linear
Self-locking mode mechanism in birefringence fiber generates ultrashort femtosecond laser pulse, and makes laser in annular chamber along one-way transmission,
Exporting high-power wavelength by the second Polarization Controller is λ0Femtosecond pulsed laser to supercontinuum generation and monitoring mould group；
Similarly, the third semiconductor laser in same time, ring laser mould group, the wavelength of transmitting are λ2Even
Continuous pump laser beam enters annular chamber after two equal part of four-in-one photo-coupler with both direction, multiple by the first wavelength-division respectively
After device and the second wavelength division multiplexer, ytterbium doped optical fiber amplifier is pumped from both direction.Pumping source mould group output wavelength be
λ2Nanosecond pulse seed laser carry out power amplification by ytterbium doped optical fiber amplifier, while the nanosecond pulse laser first passes through
The first negative GVD optical fiber is crossed, pulse is compressed, since ytterbium doped optical fiber amplifier has positive GVD, so the nanosecond pulse is passed through
It stretches, after the second negative GVD optical fiber, pulse has obtained second compression again, and chirp (chirp) is carried out in annular chamber and is mended
It repays.Using the nonlinear birefringence effect in optical fiber, ultrashort fly is generated based on the self-locking mode mechanism in nonlinear birefringence optical fiber
Second grade laser pulse, and make the laser in annular chamber along one-way transmission, exporting high-power wavelength by the second Polarization Controller is
λ2Femtosecond pulsed laser to supercontinuum generation and monitoring mould group；
(9) wavelength of ring laser mould group output is respectively λ0、λ1、λ2Femtosecond pulsed laser enter continuous spectrum production
In raw and monitoring mould group, after entering PCF by PCF coupler, due to the nonlinear effect that each rank is all types of in PCF, formed
Respectively with λ0、λ1、λ2Centered on spectrum widening, the width and intensity and λ of broadening0、λ1、λ2Femtosecond pulsed laser power
Directly proportional, the spectrum of three broadenings is overlapped mutually, and forms femtosecond super continuous spectrums pulse laser；
(10) femtosecond super continuous spectrums pulse laser passes through output interface by being divided into two-way after one-in-and-two-out optical fiber all the way
Output；Another way enters wide spectrum spectrometer and is monitored, and super continuous spectrums monitoring result is sent to controller；
(11) controller analyzes super continuous spectrums monitoring result, evaluates its spectrum flatness, while generating new needle
To the first shaping amplifier, the second shaping amplifier, third shaping amplifier amplification factor A1、A2、A3；
(12) (5) to (11) constantly are repeated, until super continuous spectrums monitoring result meets flatness requirement.It so far, will be newest
A1、A2、A3It is fixed, finally realize the super continuous spectrums laser of high output spectrum flatness and stability.
The invention has the advantages that by the way of a kind of pumping of reaction type amplitude modulation multiwavelength laser, in conjunction with wide light
Spectrum monitoring is composed, the intensity of multi wavelength pumping laser is adaptively adjusted, by the high output spectrum flatness of superposition realization and surely
Qualitative super continuous spectrums laser output, meets the needs of precision wide spectrum quantitative analysis.
Detailed description of the invention
Fig. 1 is the principle of the present invention figure, in figure: 1 --- controller；2 --- pumping source mould group；3 --- power governor；
4 --- the first impulse generator；5 --- the first shaping amplifier；6 --- first laser diode；7 --- the first field-effect
Pipe；8 --- the first field-effect tube driving circuit；9 --- the second impulse generator；10 --- the second shaping amplifier；11——
Second laser diode；12 --- the second field-effect tube；13 --- the second field-effect tube driving circuit；14 --- third pulse hair
Raw device；15 --- third shaping amplifier；16 --- third field-effect tube driving circuit；17 --- third field-effect tube；
18 --- third laser diode；19 --- three-in-one optical fiber；20 --- the first Polarization Controller；21 --- optoisolator；
22 --- ring laser mould group；23 --- the first negative GVD optical fiber；24 --- the first wavelength division multiplexer；25 --- the 4th polarization
Controller；26 --- Faraday isolator；27 --- third Polarization Controller；28 --- ytterbium doped optical fiber amplifier；29——
Second wavelength division multiplexer；30 --- the second negative GVD optical fiber；31 --- the second Polarization Controller；32 --- supercontinuum generation and
Monitor mould group；33 --- PCF coupler；34——PCF；35 --- one-in-and-two-out optical fiber；36 --- output interface；37 --- it is wide
Spectral coverage spectrometer；38 --- four-in-one photo-coupler；39 --- the first semiconductor laser；40 --- the second semiconductor laser
Device；41 --- third semiconductor laser；42 --- first laser tube drive circuit；43 --- second laser tube drive circuit；
44 --- third laser tube drive circuit；45 --- annular chamber.
Note: GVD, that is, group velocity dispersion, group velocity dispersion；PCF, that is, photonic crystal
Fiber, photonic crystal fiber.
Specific embodiment
The specific embodiment of the invention is as shown in Figure 1.
The structure of the super continuous spectrums laser of high output spectrum flatness and stability proposed by the present invention is as shown in Figure 1,
The super continuous spectrums laser is by controller 1, pumping source mould group 2, ring laser mould group 22 and supercontinuum generation and monitoring mould
32 composition of group.
Pumping source mould group 2 is used to generate the multi-Wavelength Pulses seed laser of loop laser device assembly 22.It includes power tune
Save device 3, the first impulse generator 4, the first shaping amplifier 5, first laser tube drive circuit 42, the second impulse generator 9, the
Two shaping amplifiers 10, second laser tube drive circuit 43, third impulse generator 14, third shaping amplifier 15, third swash
Light pipe driving circuit 44, three-in-one optical fiber 19, the first Polarization Controller 20 and optoisolator 21；Wherein first laser pipe driving electricity
Road 42 is made of the first field-effect tube driving circuit 8, the first field-effect tube 7 and first laser diode 6 and its discharge loop；Class
As, second laser tube drive circuit 43 is by the second field-effect tube driving circuit 13, the second field-effect tube 12 and second laser two
Pole pipe 11 and its discharge loop composition；Third laser tube drive circuit 44 is imitated by third field-effect tube driving circuit 16, third field
It should pipe 17 and third laser diode 18 and its discharge loop composition；Power governor 3 is used for the first shaping amplifier 5, the
Two shaping amplifiers 10, third shaping amplifier 15 amplify the adjusting of multiple.
Ring laser mould group 22 includes the first semiconductor laser 39, the second semiconductor laser 40, third semiconductor
Laser 41, four-in-one photo-coupler 38, annular chamber 45, the first negative GVD optical fiber 23, the first wavelength division multiplexer 24, Yb dosed optical fiber
Amplifier 28, the second wavelength division multiplexer 29, the second negative GVD optical fiber 30, the second Polarization Controller 31, third Polarization Controller 27,
Faraday isolator 26 and the 4th Polarization Controller 25, the multi-Wavelength Pulses seed for being sent to pumping source mould group 2
Laser carries out power amplification and pulse mode-locked compression.
Supercontinuum generation and monitoring mould group 32 include PCF coupler 33, PCF34, one-in-and-two-out optical fiber 35, output interface
36 and wide spectrum spectrometer 37, real-time monitoring is carried out for generating super continuous spectrums pulse laser, while to its spectral characteristic, and
Monitoring result is fed back into controller 1.
Controller 1 is containing the hardware circuit and software systems for executing control with data analysis, for controlling the first semiconductor
Laser 39, the second semiconductor laser 40, third semiconductor laser 41, the first impulse generator 4, the second impulse generator
9, third impulse generator 14, power governor 3 and wide spectrum spectrometer 37, and receive the output spectrum of wide spectrum spectrometer 37
Signal carries out spectral data analysis.
The super flat spectrum of super continuous spectrums laser exports and high stable characteristic is realized according to the following steps:
(1) according to the zero-dispersion wavelength λ of PCF340, find out its corresponding frequency f0；Setpoint frequency difference Δ f, setpoint frequency f1
=f0+ Δ f finds out its corresponding wavelength X1；Similarly, setpoint frequency f2=f0Δ f finds out its corresponding wavelength X2；(at this
λ in embodiment0=780nm, f0=3.85 × 1014Hz；Δ f=2 × 1014Hz；f1=5.85 × 1014Hz, λ1=513nm；f2=
1.85×1014Hz, λ2=1247nm)
(2) selecting the operation wavelength of first laser diode 6 and the first semiconductor laser 39 is λ0；Select second laser
The operation wavelength of diode 11 and the second semiconductor laser 40 is λ1；Third laser diode 18 and third semiconductor is selected to swash
The operation wavelength of light device 41 is λ2；
(3) controller 1 issues control instruction to the first impulse generator 4, the second impulse generator 9 and third pulse generation
The pulse frequency of three is set as identical value and is allowed to start work by device 14；(pulse frequency is in the present embodiment
100MHz)
(4) controller 1 issues control instruction starting the first semiconductor laser 39, the second semiconductor laser 40, third
Semiconductor laser 41, wide spectrum spectrometer 37；
(5) controller 1 issues control instruction to power governor 3, and power governor 3 is by the first shaping amplifier 5, second
One identical initial value A of amplification factor setting of shaping amplifier 10, third shaping amplifier 151=A2=A3；
The frequency that (6) first impulse generators 4 issue is that the electric pulse of 100MHz carries out first through the first shaping amplifier 5
Shaping pulse adjusts high level duty ratio, and the frequency for forming nanosecond is the electric pulse of 100MHz, then presses A1Multiple carries out function
After rate amplification, the field-effect tube being sent into the first field-effect tube driving circuit 8 in first laser tube drive circuit 42 drives core
The control pin of piece, the output pin of field-effect tube driving chip generate the nanosecond pulse signal that frequency is 100MHz and are used to control
The on and off of the first field-effect tube of high-speed high-power 7 processed, for controlling the charge and discharge of 6 discharge loop of first laser diode
Electricity makes first laser diode 6 generate the nanosecond pulse seed laser of repetition 100MHz；
Similarly, the electric pulse that the frequency that the second impulse generator 9 issues is 100MHz is first through the second shaping amplifier 10
Shaping pulse is first carried out, high level duty ratio is adjusted, the frequency for forming nanosecond is the electric pulse of 100MHz, then presses A2Multiple
The field-effect tube in the second field-effect tube driving circuit 13 after carrying out power amplification, in feeding second laser tube drive circuit 43
The control pin of driving chip, the output pin of field-effect tube driving chip generate the nanosecond pulse signal that frequency is 100MHz
For controlling the on and off of the second field-effect tube of high-speed high-power 12, for controlling 11 discharge loop of second laser diode
Charge and discharge, make second laser diode 11 generate repetition 100MHz nanosecond pulse seed laser；
Similarly, the electric pulse that the frequency that third impulse generator 14 issues is 100MHz is first through third shaping amplifier 15
Shaping pulse is first carried out, high level duty ratio is adjusted, the frequency for forming nanosecond is the electric pulse of 100MHz, then presses A3Multiple
The field-effect tube in third field-effect tube driving circuit 16 after carrying out power amplification, in feeding third laser tube drive circuit 44
The control pin of driving chip, the output pin of field-effect tube driving chip generate the nanosecond pulse signal that frequency is 100MHz
For controlling the on and off of high-speed high-power third field-effect tube 17, for controlling 18 discharge loop of third laser diode
Charge and discharge, make third laser diode 18 generate repetition 100MHz nanosecond pulse seed laser；
(7) three beams wavelength is respectively λ0、λ1、λ2Pulse seed laser through in three-in-one 19 coupled into optical fibres of optical fiber, then pass through
First Polarization Controller 20 and optoisolator 21 are transferred into ring laser mould group 22.First Polarization Controller 20 and optical isolation
The effect of device 21 is to eliminate the issuable echo interference of ring laser mould group 22；
(8) the first semiconductor laser 39 in ring laser mould group 22, the wavelength of transmitting are λ0Continuous pumping laser
Beam enters annular chamber 45 after 41 liang of equal parts of four-in-one photo-coupler with both direction, passes through the first wavelength division multiplexer 24 respectively
After the second wavelength division multiplexer 29, ytterbium doped optical fiber amplifier 28 is pumped from both direction.Pumping source mould group 2 export wavelength be
λ0Nanosecond pulse seed laser carry out power amplification by ytterbium doped optical fiber amplifier 28, while nanosecond pulse laser is first
By the first negative GVD optical fiber 10, pulse is compressed, since ytterbium doped optical fiber amplifier 28 has positive GVD, so nanosecond arteries and veins
Punching have passed through stretching, and after the second negative GVD optical fiber 23, pulse has obtained second compression again, and chirp is carried out in annular chamber 45
(chirp) it compensates.Third Polarization Controller 27, Faraday isolator 26 and the 4th Polarization Controller 25 form a resonance
Device forms equivalent saturable absorber using nonlinear polarization rotation, recycles the nonlinear birefringence effect in optical fiber
It answers, ultrashort femtosecond laser pulse is generated based on the self-locking mode mechanism in nonlinear birefringence optical fiber, and make in annular chamber 45
For laser along one-way transmission, exporting high-power wavelength by the second Polarization Controller 31 is λ0Femtosecond pulsed laser to super continuous
Spectrum generates and monitoring mould group 32；
Meanwhile the second semiconductor laser 40 in ring laser mould group 22, the wavelength of transmitting are λ1Continuous pumping swashs
Light beam enters annular chamber 45 after 41 liang of equal parts of four-in-one photo-coupler with both direction, passes through the first wavelength division multiplexer respectively
24 and second after wavelength division multiplexer 29, pumps ytterbium doped optical fiber amplifier 28 from both direction.The wavelength that pumping source mould group 2 exports
For λ1Nanosecond pulse seed laser carry out power amplification, while the nanosecond pulse laser by ytterbium doped optical fiber amplifier 28
The first negative GVD optical fiber 10 is first passed through, pulse is compressed, since ytterbium doped optical fiber amplifier 28 has positive GVD, so the nanosecond
Pulse have passed through stretching, and after the second negative GVD optical fiber 23, pulse has obtained second compression again, and Zhou is carried out in annular chamber 45
Sing (chirp) compensation.Ultrashort femtosecond laser pulse is generated based on the self-locking mode mechanism in nonlinear birefringence optical fiber, and makes ring
For laser in shape chamber 45 along one-way transmission, exporting high-power wavelength by the second Polarization Controller 31 is λ0Femtosecond pulse swash
Light is to supercontinuum generation and monitors mould group 32；
Similarly, the third semiconductor laser 41 in same time, ring laser mould group 22, the wavelength of transmitting are
λ2Continuous pump laser beam enters annular chamber 45 after 41 liang of equal parts of four-in-one photo-coupler with both direction, respectively by the
After one wavelength division multiplexer 24 and the second wavelength division multiplexer 29, ytterbium doped optical fiber amplifier 28 is pumped from both direction.Pumping source mould
The wavelength of 2 output of group is λ2Nanosecond pulse seed laser by ytterbium doped optical fiber amplifier 28 carry out power amplification, simultaneously should
Nanosecond pulse laser first passes through the first negative GVD optical fiber 10, and pulse is compressed, since ytterbium doped optical fiber amplifier 28 has just
GVD, so the nanosecond pulse have passed through stretching, after the second negative GVD optical fiber 23, pulse has obtained second compression again, in ring
Chirp (chirp) compensation is carried out in shape chamber 45.Using the nonlinear birefringence effect in optical fiber, it is based on nonlinear birefringence optical fiber
In self-locking mode mechanism generate ultrashort femtosecond laser pulse, and make the laser in annular chamber 45 along one-way transmission, pass through second
It is λ that Polarization Controller 31, which exports high-power wavelength,2Femtosecond pulsed laser to supercontinuum generation and monitoring mould group 32；
(9) wavelength that ring laser mould group 22 exports is respectively λ0、λ1、λ2Femtosecond pulsed laser enter continuous spectrum
Generate and monitoring mould group 32 in, after entering PCF 34 by PCF coupler 33, due to all types of non-thread of each rank in PCF34
Property effect, formed respectively with λ0、λ1、λ2Centered on spectrum widening, the width and intensity and λ of broadening0、λ1、λ2Femtosecond
Pulsed laser power is directly proportional, and the spectrum of three broadenings is overlapped mutually, and forms femtosecond super continuous spectrums pulse laser, the present embodiment
Middle super continuous spectrums range is 400nm-2500nm；
(10) femtosecond super continuous spectrums pulse laser is connect by output all the way by being divided into two-way after one-in-and-two-out optical fiber 35
Mouth 36 exports；Another way enters wide spectrum spectrometer 37 and is monitored, and super continuous spectrums monitoring result is sent to controller 1；
(11) controller 1 analyzes super continuous spectrums monitoring result, evaluates its spectrum flatness, while generating new needle
To the first shaping amplifier 5, the second shaping amplifier 10, third shaping amplifier 15 amplification factor A1、A2、A3；
(12) (5) to (11) constantly are repeated, until super continuous spectrums monitoring result meets flatness requirement.It so far, will be newest
A1、A2、A3It is fixed, finally realize the super continuous spectrums laser of high output spectrum flatness and stability.
Claims (1)
1. a kind of super flat super continuous spectrums laser acquisition methods of femtosecond, this method is the super continuous spectrums in the output of super flat spectrum
Realized on laser, the super continuous spectrums laser include controller (1), pumping source mould group (2), power governor (3),
First impulse generator (4), the first shaping amplifier (5), first laser diode (6), the first field-effect tube (7), first
Effect tube drive circuit (8), the second impulse generator (9), the second shaping amplifier (10), second laser diode (11)；The
Two field-effect tube (12), the second field-effect tube driving circuit (13), third impulse generator (14), third shaping amplifier
(15), third field-effect tube driving circuit (16), third field-effect tube (17), third laser diode (18), three-in-one optical fiber
(19), the first Polarization Controller (20), optoisolator (21), ring laser mould group (22), the first negative GVD optical fiber (23),
One wavelength division multiplexer (24), Faraday isolator (26), third Polarization Controller (27), is mixed the 4th Polarization Controller (25)
Ytterbium optical fiber amplifier (28), the second wavelength division multiplexer (29), the second negative GVD optical fiber (30), the second Polarization Controller (31), super company
Continuous spectrum generates and monitoring mould group (32), PCF coupler (33), PCF (34), one-in-and-two-out optical fiber (35), output interface (36), width
Spectral coverage spectrometer (37), four-in-one photo-coupler (38), the first semiconductor laser (39), the second semiconductor laser (40),
Third semiconductor laser (41), first laser tube drive circuit (42), second laser tube drive circuit (43), third laser tube
Driving circuit (44), annular chamber (45)；It is characterized in that the super flat super continuous spectrums laser acquisition methods of femtosecond are as follows:
1) according to the zero-dispersion wavelength λ of PCF0, find out its corresponding frequency f0；Setpoint frequency difference Δ f, setpoint frequency f1=f0+Δ
F finds out its corresponding wavelength X1；Similarly, setpoint frequency f2=f0Δ f finds out its corresponding wavelength X2；
2) select the operation wavelength of first laser diode and the first semiconductor laser for λ0；Select second laser diode and
The operation wavelength of second semiconductor laser is λ1；Select the operation wavelength of third laser diode and third semiconductor laser
For λ2；
3) controller issues control instruction to the first impulse generator, the second impulse generator and third impulse generator, by three
The pulse frequency of person is set as identical value and is allowed to start work；
4) controller issues control instruction starting the first semiconductor laser, the second semiconductor laser, third semiconductor laser
Device, wide spectrum spectrometer；
5) controller issues control instruction to power governor, and power governor amplifies the first shaping amplifier, the second shaping
One identical initial value A of amplification factor setting of device, third shaping amplifier1=A2=A3；
6) high frequency electric pulse that the first impulse generator issues carries out shaping pulse through the first shaping amplifier first, adjusts high electricity
Flat duty ratio forms the high frequency electric pulse of nanosecond, then presses A1After multiple carries out power amplification, it is sent into the driving of first laser pipe
The control pin of the field-effect tube driving chip in the first field-effect tube driving circuit in circuit, field-effect tube driving chip
The nanosecond pulse signal that output pin generates high frequency is used to control the on and off of the first field-effect tube of high-speed high-power, uses
Charge and discharge in control first laser diode discharge circuit make first laser diode generate the nanosecond pulse seed of high frequency
Laser；
Similarly, the high frequency electric pulse that the second impulse generator issues carries out shaping pulse through the second shaping amplifier first, adjusts
High level duty ratio is saved, the high frequency electric pulse of nanosecond is formed, then presses A2After multiple carries out power amplification, it is sent into second laser
The control pin of the field-effect tube driving chip in the second field-effect tube driving circuit in tube drive circuit, field-effect tube driving
The output pin of chip generates high frequency nanosecond pulse signal and is used to control the conducting of the second field-effect tube of high-speed high-power and cuts
Only, for controlling the charge and discharge in second laser diode discharge circuit, second laser diode is made to generate high frequency nanosecond pulse
Seed laser；
Similarly, the high frequency electric pulse that third impulse generator issues carries out shaping pulse through third shaping amplifier first, adjusts
High level duty ratio is saved, the high frequency electric pulse of nanosecond is formed, then presses A3After multiple carries out power amplification, it is sent into third laser
The control pin of the field-effect tube driving chip in third field-effect tube driving circuit in tube drive circuit, field-effect tube driving
The nanosecond pulse signal that the output pin of chip generates high frequency be used to control high-speed high-power third field-effect tube conducting and
Cut-off makes third laser diode generate the nanosecond of high frequency for controlling the charge and discharge of third laser diode discharge loop
Pulse seed laser；
7) three beams wavelength is respectively λ0、λ1、λ2Pulse seed laser through in three-in-one fiber coupling entering light fibre, then partially through first
Vibration controller and optoisolator are transferred into ring laser mould group；The effect of first Polarization Controller and optoisolator is to eliminate
The issuable echo interference of ring laser mould group；
8) the first semiconductor laser in ring laser mould group, the wavelength of transmitting are λ0Continuous pump laser beam is closed by four
Annular chamber is entered with both direction after one photo-coupler, two equal part, passes through the first wavelength division multiplexer and the second wavelength division multiplexer respectively
Later, ytterbium doped optical fiber amplifier is pumped from both direction；The wavelength of pumping source mould group output is λ0Nanosecond pulse seed swash
Light carries out power amplification by ytterbium doped optical fiber amplifier, while the nanosecond pulse laser first passes through the first negative GVD optical fiber, pulse
It is compressed, since ytterbium doped optical fiber amplifier has positive GVD, so the nanosecond pulse have passed through stretching, it is negative using second
After GVD optical fiber, pulse has obtained second compression again, and chirp (chirp) compensation is carried out in annular chamber；Third Polarization Controller, method
Optoisolator and the 4th Polarization Controller is drawn to form a resonator, using nonlinear polarization rotation, formation is equivalent can
Saturated absorbing body recycles the nonlinear birefringence effect in optical fiber, based on the self-locking mode mechanism in nonlinear birefringence optical fiber
Ultrashort femtosecond laser pulse is generated, and makes the laser in annular chamber along one-way transmission, is exported by the second Polarization Controller big
The a length of λ of power waves0Femtosecond pulsed laser to supercontinuum generation and monitoring mould group；
Meanwhile the second semiconductor laser in ring laser mould group, the wavelength of transmitting are λ1Continuous pump laser beam passes through four
Annular chamber is entered with both direction after unification two equal part of photo-coupler, passes through the first wavelength division multiplexer and the second wavelength-division multiplex respectively
After device, ytterbium doped optical fiber amplifier is pumped from both direction；The wavelength of pumping source mould group output is λ1Nanosecond pulse seed
Laser carries out power amplification by ytterbium doped optical fiber amplifier, while the nanosecond pulse laser first passes through the first negative GVD optical fiber, arteries and veins
Punching is compressed, since ytterbium doped optical fiber amplifier has positive GVD, so the nanosecond pulse have passed through stretching, using second
After negative GVD optical fiber, pulse has obtained second compression again, and chirp compensation is carried out in annular chamber；Based in nonlinear birefringence optical fiber
Self-locking mode mechanism generate ultrashort femtosecond laser pulse, and make the laser in annular chamber along one-way transmission, pass through the second polarization
It is λ that controller, which exports high-power wavelength,1Femtosecond pulsed laser to supercontinuum generation and monitoring mould group；
Similarly, the third semiconductor laser in same time, ring laser mould group, the wavelength of transmitting are λ2Continuous pump
Pu laser beam enters annular chamber after two equal part of four-in-one photo-coupler with both direction, passes through the first wavelength division multiplexer respectively
After the second wavelength division multiplexer, ytterbium doped optical fiber amplifier is pumped from both direction；The wavelength of pumping source mould group output is λ2's
Nanosecond pulse seed laser carries out power amplification by ytterbium doped optical fiber amplifier, while the nanosecond pulse laser first passes through the
One negative GVD optical fiber, pulse are compressed, since ytterbium doped optical fiber amplifier has positive GVD, so the nanosecond pulse have passed through drawing
It stretches, after the second negative GVD optical fiber, pulse has obtained second compression again, and chirp compensation is carried out in annular chamber；Using in optical fiber
Nonlinear birefringence effect, ultrashort femtosecond laser pulse is generated based on the self-locking mode mechanism in nonlinear birefringence optical fiber,
And make the laser in annular chamber along one-way transmission, exporting high-power wavelength by the second Polarization Controller is λ2Femtosecond pulse
Laser is to supercontinuum generation and monitors mould group；
9) wavelength of ring laser mould group output is respectively λ0、λ1、λ2Femtosecond pulsed laser enter continuous spectrum generate and prison
Survey in mould group, after entering PCF by PCF coupler, due to the nonlinear effect that each rank is all types of in PCF, formed respectively with
λ0、λ1、λ2Centered on spectrum widening, the width and intensity and λ of broadening0、λ1、λ2Femtosecond pulsed laser power at just
Than the spectrum of three broadenings is overlapped mutually, and forms femtosecond super continuous spectrums pulse laser；
10) femtosecond super continuous spectrums pulse laser is exported by output interface all the way by being divided into two-way after one-in-and-two-out optical fiber；
Another way enters wide spectrum spectrometer and is monitored, and super continuous spectrums monitoring result is sent to controller；
11) controller analyzes super continuous spectrums monitoring result, evaluates its spectrum flatness, while generating and new being directed to first
Shaping amplifier, the second shaping amplifier, third shaping amplifier amplification factor A1、A2、A3；
12) step 5) is constantly repeated to 11), until super continuous spectrums monitoring result meets flatness requirement, so far, by newest A1、
A2、A3It is fixed, finally realize the super continuous spectrums laser of high output spectrum flatness and stability.
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| CN117477329B (en) * | 2023-12-20 | 2024-03-19 | 吉林省科英医疗激光有限责任公司 | High-power semiconductor pumping fiber laser parallel driving power supply and control method thereof |
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