CN109149336A - Passive Q-adjusted mode-locked laser based on SBS and fabry perot interferometer - Google Patents
Passive Q-adjusted mode-locked laser based on SBS and fabry perot interferometer Download PDFInfo
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- CN109149336A CN109149336A CN201811240281.2A CN201811240281A CN109149336A CN 109149336 A CN109149336 A CN 109149336A CN 201811240281 A CN201811240281 A CN 201811240281A CN 109149336 A CN109149336 A CN 109149336A
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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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
- H01S3/06791—Fibre ring lasers
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- H—ELECTRICITY
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- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1062—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using a controlled passive interferometer, e.g. a Fabry-Perot etalon
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
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Abstract
The invention discloses a kind of passive Q-adjusted mode-locked laser based on SBS and fabry perot interferometer, it include: pumping source, gain fibre, optical fibre wavelength division multiplexer, passive optical fiber, fiber bragg grating and fabry perot interferometer, fabry perot interferometer has the fiber end face of a little spacing to constitute by two, it can be ordinary optic fibre wire jumper end face and ordinary optic fibre wire jumper end face precisely align by end optical fiber flange plate and leave spacing, be also possible to conventional fiber end face and conventional fiber end face and precisely aligned by other optical alignment apparatus and leave spacing composition.Pumping source and gain fibre are determined according to actual wavelength demands.The center reflection wavelength of fiber bragg grating and the gain wavelength of gain fibre are corresponding.Two reuse wavelengths of optical fibre wavelength division multiplexer are the gain wavelength of pumping wavelength and gain fibre respectively.The present invention can inhibit the unstability of the exomonental amplitude of Brillouin's passive Q-regulaitng laser, repetition rate and spectrum.
Description
Technical field
The invention belongs to Fiber laser technology field, more particularly, to one kind based on multistage stimulated Brillouin scattering and
The passive Q-adjusted mode-locked laser of fabry perot interferometer.
Background technique
As one of a kind of nonlinear effect important in optical fiber, stimulated Brillouin scattering possesses lesser excitation threshold,
It is nonlinear to be scattered backwards to light, possess be widely applied always, Fibre Optical Sensor and pulsewidth pressure such as based on Brillouin's backscattering
Contracting, the slower rays control realized based on the variation of group index caused by stimulated Brillouin scattering, in multimode fibre using being excited in cloth
Deep pool scatters the phase conjugation realized and beam quality optimization and the passive Q-adjusted effect and tune that utilize stimulated Brillouin scattering to realize
Make unstable effect.As one of the pulse generation means that can be able to achieve all-fiber, stimulated Brillouin scattering (Stimulated
Brillouin Scattering, SBS) passive Q-adjusted effect and relaxation oscillation effect be always ultra-fast optical research hot topic
Topic.Early in 1997, researcher just realizes in rare earth ion doped optical fiber laser for the first time to be dissipated based on Brillouin
The self-starting Q-switch penetrated, the both ends feedback used in experiment are optical fiber ring resonator and reflecting mirror, anti-as typical narrow linewidth
Device is presented, is used till today always using the experimental program of optical fiber ring resonator.Then, researcher is had found again based on SBS's
The phenomenon that modulating unstable effect transmitting mode locking pulse.Since the passive Q-adjusted and mode-locked laser based on SBS is arbitrarily having gain
Wavelength nearby can build, SBS effect threshold value can be reduced with the increase of fiber lengths, and not need additional light device
Part builds simplicity, therefore the important research content of always laser field.
However, there is output pulse is unstable all the time for the passive Q-regulaitng laser of SBS due to the kinetics mechanism of SBS
Fixed feature.Unstability based on the passive Q-adjusted output pulse of SBS is from existing random thermal noise in laser and at random
Rayleigh scattering.Thermal noise plays a part of starting Brillouin scattering during Brillouin scattering.And it is brought by Rayleigh scattering
Feedback effect then constitute the resonant cavity of Brillouin laser.The usual line width of optical fiber ring resonator employed in previous experiment
It is relatively narrow, it is easy to excite stimulated Brillouin scattering, and to multistage Stokes light without feedback effect, random thermal noise and random Rayleigh
Be scattered in during unstable tune Q served it is the most key.In fact, the passive Q-adjusted effect of Brillouin's Q-switched laser
It is as caused by the collective effect of nonlinear Brillouin's backscattering and linear Rayleigh scattering, due to causing spontaneous Brillouin
The thermal noise and back rayleigh scattering of scattering all have randomness, cause Q impulse amplitude and repetition rate 20%~
It is fluctuated in the range of 40%.Therefore SBS passive Q-adjusted unstability and uncontrollability are caused, although the characteristic can generate
The pulse of great peak power-average power ratio once in a while, but also have very big defect.
Firstly, the uncontrollable superpower pulse of the amplitude accidentally generated can cause optical fiber damage and the damage of optical device；Its
Secondary, Q impulse would generally be along with spurious pulse and with multi-peaks structure；Finally, adjusting the amplitude and repetition rate of Q output pulse
It is very unstable.Therefore, the passive Q-adjusted application based on SBS is extremely restricted.Weaken thermal noise and the shadow of other noises
It rings, there is researcher to suggest testing under low temperature environment or other isolated blobs, for example, can be by adding intracavitary
Enter acousto-optic modulator and the repetition rate that actively modulation carrys out stable pulse is carried out to pulse, can also be controlled by modulated pumping pulse
The repetition rate of Q impulse is stablized in gain processed with this, but which but helps amplitude stability less, also, above
In two ways, the stability of spectrum is not referred to.All these means are although effective, but by system complex
Change, weakens the advantage of the convenient all-fiber of Brillouin's passive Q-regulaitng laser economy, and do not tackle the problem at its root.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of all-fiber based on multistage by
Thus the passive Q-adjusted mode-locked laser for swashing Brillouin scattering and fabry perot interferometer solves existing based on excited Brillouin
Scattering passive Q-regulaitng laser export it is unstable, damage optical device and be difficult to practical technical problem.
To achieve the above object, the present invention provides a kind of passive Q-adjusted mode locking based on SBS and fabry perot interferometer
Laser, comprising: pumping laser unit, fabry perot interferometer, passive optical fiber and fiber bragg grating；
The pumping laser unit is connected with the fabry perot interferometer and the fiber bragg grating respectively；
The pumping laser unit and realizes stimulated radiation to the pump energy for realizing the importing of pump energy
Amplification is converted to laser energy；
Reflection of the fiber bragg grating for realizing laser, and then the shape together with the fabry perot interferometer
At straight cavate resonant cavity；
The passive optical fiber is placed in any position in the straight cavate resonant cavity for accumulating brillouin effect；
The fabry perot interferometer is used for the wavelength loss modulating action using its Nano grade having to being excited
The multistage stokes light that Brillouin scattering generates is modulated to obtain stable Q impulse or mode locking pulse, so respectively
The Q impulse or mode locking pulse are exported from the fabry perot interferometer end afterwards.
Preferably, the fabry perot interferometer is made of the first fiber end face and the second fiber end face, and described
One fiber end face is aligned with second fiber end face and there are default spacing therebetween.
Preferably, first fiber end face is ordinary optic fibre end face, and second fiber end face is ordinary optic fibre end face
Or by surface reflection enhancing treated fiber end face.
Preferably, the pumping laser unit includes: pumping source, optical fibre wavelength division multiplexer and gain fibre；
The pumping source is connected with the short wavelength end of the optical fibre wavelength division multiplexer, and two of the optical fibre wavelength division multiplexer
Long wavelength end is connected with first fiber end face and the gain fibre respectively, the gain fibre and the optical fiber Bragg
Grating is connected；
The pumping source is for realizing the importing of pump energy, and the optical fibre wavelength division multiplexer is for coupling pump energy
Enter the straight cavate resonant cavity, and laser energy is converted to by the gain fibre, the gain fibre is for realizing particle
Number reversion.
Preferably, the default spacing between first fiber end face and second fiber end face is at 5 μm to 1000 μm
Between.
Preferably, the 3dB reflection bandwidth of the fiber bragg grating is between 0.5nm and 10nm.
Preferably, the rare earth ion that the gain fibre is adulterated be one of ytterbium ion, erbium ion and thulium ion or
Person is a variety of.
Preferably, undoped with gain media in the passive optical fiber.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) the conventional passive Q-regulaitng laser based on SBS is that q-operation is realized by nonlinear Brillouin scattering, usually
The method that optical resonance enhances in ring is caused to cause stimulated Brillouin scattering using optical fiber ring resonator, but all the time due to lacking
Few particular feedback to multistage stokes light, therefore the spontaneous brillouin scattering that is generated by random thermal noise and accidental distributed
Rayleigh scattering plays an important role in the start-up course of Q impulse.Therefore the pulse launched is random, unstable
, be difficult to it is practical.One fiber end face 7 and a fiber end face 6 are connected to each other by the present invention, and are left a void, and are thus generated
One intracavitary fabry perot interferometer, this interferometer can carry out the regulation of nanometer scale, Neng Gou to the loss of wavelength
The primary condition for meeting SBS tune Q also has feedback effect to the stokes light of specific grade later, so that the not stoke of same order
This plays a different role during adjusting Q, and especially the feedback to specific rank stokes light is so that the rank stoke light
Play the role of stable pulse.Therefore the influence of thermal noise and random Rayleigh scattering for output pulse is weakened, realizes arteries and veins
Rush the output of the sufficiently stable Q-switched pulse and mode locking pulse based on SBS of amplitude, repetition rate and spectrum.
(2) compared with conventional passive Q-adjusted mode-locked laser, having can operate at multiple wavelengths, damage threshold
The advantages of height, all-fiber is easy to integrate, low in cost, and output power is high, and device is few, and optical path is simply integrated.It is conventional at present
Q-switch laser producing method mainly have the passive Q-adjusted mode such as saturated absorbing body, nonlinear loop mirror, nonlinear polarization rotation,
There are the actively Q-switcheds modes such as electric-optically Q-switched, acousto-optic Q modulation, tilting mirror tune Q, actively Q-switched mode can operate at multiple wavelengths, but at
This is higher, and system complex, it is difficult to integrate.Saturated absorbing body tune Q is then because the specific wavelength absorption of saturated absorbing body causes to satisfy
It can only work under particular range of wavelengths with absorber, and the damage threshold of general saturated absorbing body is far below optical fiber itself
Damage threshold, it is suppressed that optical fiber can transmission power potentiality, seed light generators duty can only be used as under low-power.As for non-
The modes such as linear annular mirror, nonlinear polarization rotation then need specific device to support, higher cost.And it is of the invention based on
The passive Q-adjusted mode-locked laser of SBS, operation mechanism are nonlinear stimulated Brillouin scattering effects, therefore theoretically can be in office
Meaning is not limited by wavelength with generating under the medium and wavelength of brillouin gain.Secondly, based on passive Q-adjusted lock of the invention
The construction of mode laser, it is low in cost, it is only necessary to dock two fiber end faces, such as optical patchcord end face.It is easy to operate, easily
In realization, the cost of pulse generation further reduced.Secondly, can realize all -fiber easily based on structure of the invention
Change encapsulation, is easy to integrate with other systems, such as multi-stage amplifier system, sensor-based system etc..Furthermore due to construction letter of the invention
Single, the optical device used is less, therefore substantially increases the stability and damage threshold of whole system, and system can be high
Power under operate.Finally, laser structure of the invention may be implemented to adjust the output of Q and mode locking pulse, the pulsewidth model of output
It encloses from microsecond to nanosecond order, there is extensive practical use.
(3) fiber end face 6 of the invention uses ordinary optic fibre end face, once this is because fiber end face 6 is with higher
Reflectivity, then fiber end face 6 will form straight cavate resonant cavity with fiber bragg grating 5, result in the persistent oscillation of optical fiber,
Then inverted population can not be assembled, and stimulated Brillouin scattering can not form pulse output excitation.Secondly, fiber end face 7
Can be ordinary optic fibre end face can also be the fiber end face handled by reflection enhancement, if being handled by reflection enhancement, light
Reflectivity should be between 5% to 40%, because too low reflectivity will lead to Fabry amber after fine 7 reflection enhancement of end face processing
The reflection of sieve chamber is too low, keeps the feedback of stokes light very weak and is submerged in thermal noise and random Rayleigh scattering, can not be formed
Oscillation, causes the random output of Q impulse.If reflectivity is excessively high, the reflectivity of Fabry Perot chamber can be caused excessively high, made
Inverted population can only be built up in the minimum spacing range of two fiber end faces by obtaining signal light, and in most cases easily be risen
Vibration, can not form the accumulation of inverted population, so that laser is difficult the state that work is operated in pulse.
(4) present invention realizes the stably and controllable output passive Q-adjusted based on SBS, promotes based on SBS passively Q switched laser
The research and extensive use of device provide a feasible scheme for the passive Q-adjusted mode locking of all-fiber, are cheap pulse
Laser manufacture provides a feasible thinking.
Detailed description of the invention
Fig. 1 is provided in an embodiment of the present invention a kind of based on multistage stimulated Brillouin scattering and fabry perot interferometer
The structural schematic diagram of passive Q-adjusted mode-locked laser；
Fig. 2 is a kind of a kind of structure for generating fabry perot interferometer provided in an embodiment of the present invention, using wire jumper pair
Quasi- structural schematic diagram；
Fig. 3 is provided in an embodiment of the present invention a kind of based on multistage stimulated Brillouin scattering and fabry perot interferometer
The Q impulse sequence that passive Q-adjusted mode-locked laser is emitted under the pump light of 600mW；
Fig. 4 is provided in an embodiment of the present invention a kind of based on multistage stimulated Brillouin scattering and fabry perot interferometer
The radio-frequency chart for the Q impulse sequence that passive Q-adjusted mode-locked laser is emitted under the pump light of 600mW；
Fig. 5 is provided in an embodiment of the present invention a kind of based on multistage stimulated Brillouin scattering and fabry perot interferometer
The mode locking pulse sequence that passive Q-adjusted mode-locked laser is emitted；
Fig. 6 is provided in an embodiment of the present invention a kind of based on multistage stimulated Brillouin scattering and fabry perot interferometer
The radio-frequency chart for the mode locking pulse sequence that passive Q-adjusted mode-locked laser is emitted；
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1- pumping source, 2-
Wavelength division multiplexer, 3- gain fibre, the passive optical fiber of 4-, 5- fiber bragg grating, the first fiber end face of 6-, the second optical fiber end of 7-
Face, the first fusion point of 8-, the second fusion point of 9-, 10- third fusion point, the 4th fusion point of 11-, the 5th fusion point of 12-, 13- light
Fine ring flange, the first optical patchcord of 14- end face, the second optical patchcord of 15- end face, the first optical patchcord of 16-, the second optical fiber of 17-
Wire jumper.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Term " first ", " second ", " third " in description and claims of this specification, " the 4th " and " the 5th "
Etc. be for distinguishing different objects, not for description particular order.
The invention proposes a kind of passive Q-adjusted mode-locked laser based on SBS and fabry perot interferometer, it is existing to break through
There is the passive Q-adjusted and mode locking based on SBS to be unable to the limitation of practical application due to its huge randomness and unstability.Its base
This thinking is: although taking optical fiber ring resonator that can generate extremely narrow line width in existing scheme but being exaggerated the work of noise
With so as to cause the unstability of Brillouin laser tune Q.In the present invention, by a fiber end face 7 and an optical fiber end
Face 6 is connected to each other, and is left a void, and thus generates an intracavitary fabry perot interferometer, this interferometer can be to wavelength
Loss carries out the regulation of nanometer scale, can also have to the stokes light of specific grade after the primary condition for meeting SBS tune Q
There is feedback effect, therefore weaken the influence of thermal noise and random Rayleigh scattering for output pulse, realizes pulse amplitude, repeats
The output of frequency and the sufficiently stable Q-switched pulse and mode locking pulse based on SBS of spectrum.
Fig. 1 is a kind of all-fiber provided in an embodiment of the present invention based on multistage stimulated Brillouin scattering and Fabry amber
The structural schematic diagram of the passive Q-adjusted mode-locked laser of Luo Gan's interferometer, wherein pumping laser unit includes pumping source 1, optical fiber wavelength division
Multiplexer 2 and gain fibre 3；The laser further include passive optical fiber 4, fiber bragg grating 5, by the first fiber end face 6 with
And second fiber end face 7 constitute fabry perot interferometer, and connection each section caused by the first fusion point 8, second
Fusion point 9, third fusion point 10, the 4th fusion point 11, the 5th fusion point 12.
Wherein, pumping source 1 is connected with the short wavelength end of optical fibre wavelength division multiplexer 2 by the first fusion point 8, and optical fiber wavelength division is multiple
Pass through third fusion point 10 and the with the first end of gain fibre 3 and the first fiber end face 6 respectively with two long wavelength ends of device 2
Two fusion points 9 are connected, and the first fiber end face 6 and the second fiber end face 7 can pass through end optical fiber flange plate or other optics pair
Mutatis mutandis tool is aligned and there are gaps to form fabry perot interferometer, and the second fiber end face 7 is used as main output end, gain fibre
3 second end is connected with the first end of passive optical fiber 4 by the 4th fusion point 11, the second end and optical fiber Bradley of passive optical fiber 4
The first end of lattice grating 5 is connected by the 5th fusion point 12.The laser, which can work, is adjusting Q state, can also work and lock
Mould state can stablize the pulse of transmitting nanosecond to musec order.
In embodiments of the present invention, passive optical fiber 4 is the conventional fiber undoped with gain media, can be located at gain and be situated between
, can also be between the first fiber end face 6 and optical fibre wavelength division multiplexer 2 between matter 3 and fiber bragg grating 5, it can be with
Between optical fibre wavelength division multiplexer 2 and gain fibre 3, which only plays the role of accumulating brillouin effect, is placed in
Any position.
In embodiments of the present invention, the rare earth ion that gain fibre 3 is adulterated is in ytterbium ion, erbium ion and thulium ion
It is one or more kinds of.Wherein, the wavelength that pumping source emits when rare earth ion is ytterbium ion is 915nm or 976nm, and rare earth ion is
The wavelength that pumping source emits when erbium ion is 980nm or 1480nm, and the wavelength that pumping source emits when rare earth ion is thulium ion is
793nm or 980nm.
In embodiments of the present invention, the 3dB reflection bandwidth of fiber bragg grating 5 is between 0.5nm and 10nm.
In embodiments of the present invention, the spacing between the first fiber end face 6 and the second fiber end face 7 is at 5 μm to 1000 μm
Between.First fiber end face 6 is ordinary optic fibre end face, and the second fiber end face 7 can be ordinary optic fibre end face or by surface
The fiber end face of reflection enhancement processing.In the second fiber end face 7 after surface reflection enhancing processing, the 3dB of reflection enhancement
Bandwidth is not less than 0.5nm, and reflectivity is between 5% to 40%.
Ordinary optic fibre end face in embodiments of the present invention refers to routine without any processing only by cutter cutting optical fibre
Obtained end face.
In embodiments of the present invention, pumping source 1 can be the semiconductor laser of conventional fiber coupling, can also be with
It is solid state laser.Laser is exported by fiber coupling, the core diameter and gain fibre 3, passive optical fiber 4, light of output optical fibre
The core diameter one of fine Bragg grating 5, optical fibre wavelength division multiplexer 2 and fiber end face, which is shown, realizes the smallest splice loss, splice attenuation.
Laser is single wavelength laser, and center emission wavelength is located in the absorption spectra for the rare earth ion that gain fibre 3 is adulterated,
And lasting pumping can generate inverted population.
Optical fibre wavelength division multiplexer 2, is conventional optical fibre wavelength division multiplexer, and effect is that pumping wavelength is coupled into straight cavate
Resonant cavity, and straight cavate resonant cavity is connected, laser energy is converted to by gain fibre 3.Its short wavelength end coupled wavelength is pump
Pumping wavelength, two long wavelength end coupled wavelength is gain fibre launch wavelength.
Gain fibre 3 is conventional rare earth ion doped optical fiber, is made of doped core, silica clad and coat.
The absorbing wavelength of the rare earth ion of doping is corresponding with pumping wavelength, the reflection wavelength of launch wavelength and fiber bragg grating 5
It is corresponding.
Passive optical fiber 4, can be conventional silica fibre or photonic crystal fiber.By fibre core, covering and coat
Composition.
Fiber bragg grating 5 can be the Bragg grating inscribed by femtosecond laser, be also possible to other technologies
The Bragg grating of production.The gain wavelength of its center reflection wavelength and gain fibre is corresponding, i.e., its center reflection wavelength is located at
At the peak value of the emission spectra of gain fibre.
Second fiber end face 7 and the first fiber end face 6 can be the single mode optical fiber either multimode fibre of same specification, can also
To be optical patchcord, the core size of two optical patchcords is consistent.Second fiber end face 7 and the first fiber end face 6 form method
The stokes light that can be generated to cascade after FP interferometers generates different feedbacks.
The corresponding specific embodiment of schematic structural view of the invention is given below:
For the passive Q-adjusted mode locked fiber laser shown in FIG. 1 based on SBS and fabry perot interferometer, pumping source 1
For the semiconductor laser of 980nm.Wavelength division multiplexer 2 is 1 × 2 formula, three fiber port coupler, and one corresponding wavelength of port is
980nm, port two and three corresponding wavelength of port are 1550nm, and the bandwidth of three ports is ± 10nm.Gain fibre 3 is er-doped
Optical fiber, length are 9 meters, and passive optical fiber 4 is standard single-mode fiber, and length is 20 meters.The central wavelength of fiber bragg grating 5 is
1550nm, three dB bandwidth 4.9nm.First fiber end face 6 and the second fiber end face 7 are standard single mode wire jumper.
Fig. 2 show one of a kind of structure for generating fabry perot interferometer, is jumped using end optical fiber flange plate docking optical fiber
The form of line is constituted, the second optical patchcord end face 15 of the second optical patchcord 17 and the first optical patchcord of the first optical patchcord 16
End face 14 is aligned by end optical fiber flange plate 13, and is spaced about 17.4 μm between double bounce line end face, and composition is in nm magnitude to wave
Fabry Perot chamber with modulating action.Several rank stokes lights before the Fabry Perot chamber generates laser cascade
It feeds back faint, more significant feedback is produced to the rear several rank stokes lights being sequentially generated.
Fig. 3 show a kind of all-fiber provided in an embodiment of the present invention based on multistage stimulated Brillouin scattering and Fa Bu
In perot interferometer the Q impulse sequence that is emitted under the pump light of 600mW of passive Q-adjusted mode-locked laser.
Fig. 4 show a kind of all-fiber provided in an embodiment of the present invention based on multistage stimulated Brillouin scattering and Fa Bu
In perot interferometer the radio-frequency chart of Q impulse sequence that is emitted under the pump light of 600mW of passive Q-adjusted mode-locked laser.
Fig. 5 show a kind of all-fiber provided in an embodiment of the present invention based on multistage stimulated Brillouin scattering and Fa Bu
In the passive Q-adjusted mode-locked laser of perot interferometer lower after adjust the spacing between fabry perot interferometer emitted
Mode locking pulse sequence.
Fig. 6 show a kind of all-fiber provided in an embodiment of the present invention based on multistage stimulated Brillouin scattering and Fa Bu
In the passive Q-adjusted mode-locked laser of perot interferometer lower after adjust the spacing between fabry perot interferometer emitted
The radio-frequency chart of mode locking pulse sequence.
By the Wavelength modulation spectroscopy of Fabry Perot chamber, the gain spectra of gain fibre, fiber bragg grating it is anti-
It penetrates under the line widthization effect of the common superposition between spectrum three and random Rayleigh scattering, only the laser energy of narrow linewidth
Most start in intracavitary oscillation, and since the smaller feedback of Fabry Perot chamber and random rayleigh distributed formula are fed back in intracavitary aggregation
A large amount of inverted population is played, straight cavate resonant cavity enters low reactance-resistance ratio state, and narrow-linewidth laser causes cascade to be excited cloth intracavitary
In deep pool scattering, launch cascade stokes light, several rank stokes lights most started do not pass through Fabry Perot chamber
Modulation, only because intracavitary faint Rayleigh scattering distributed Feedback and fiber bragg grating form low reactance-resistance ratio resonant cavity,
After having excited after several rank stokes lights, since intracavitary feedback is significant, resonant cavity is for rear several rank stokes lights
It is high q-factor resonant cavity, launches resonant cavity in a very short period of time in the energy of intracavitary accumulation before this, form stable Q impulse.
The conventional passive Q-regulaitng laser output pulse amplitude and repetition rate usually play in the range of 20% to 40% based on SBS
Strong fluctuation seriously limits the practical application of the passive Q-regulaitng laser based on SBS, but structure through the embodiment of the present invention,
Under the pump power of 600mW, output pulse recurrence frequency instability down to 1.06%, amplitude instability down to
1.52%, as shown in figure 4, signal-to-noise ratio is up to 68.12dB, this is to realize the reached highest of passive Q-regulaitng laser currently with SBS
Signal-to-noise ratio, sufficiently demonstrate the stability of the laser.In the Fabry Perot chamber that slowly adjusting double bounce line end face is constituted
Spacing after, laser launches stable mode locking pulse sequence, and repetition rate as shown in Figure 6 is 3.6MHz and light circulation one
The time long all over chamber is corresponding, signal-to-noise ratio is up to 73.88dB, and fire pulse width is nanosecond order, it was demonstrated that the laser generates
The ability of stable narrow spaces pulse.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of passive Q-adjusted mode-locked laser based on SBS and fabry perot interferometer characterized by comprising pumping swashs
Light unit, fabry perot interferometer, passive optical fiber (4) and fiber bragg grating (5)；
The pumping laser unit is connected with the fabry perot interferometer and the fiber bragg grating (5) respectively；
The pumping laser unit and is realized and is amplified to the stimulated radiation of the pump energy for realizing the importing of pump energy
It is converted to laser energy；
Reflection of the fiber bragg grating (5) for realizing laser, and then the shape together with the fabry perot interferometer
At straight cavate resonant cavity；
The passive optical fiber (4) is placed in any position in the straight cavate resonant cavity for accumulating brillouin effect；
The fabry perot interferometer is used for the wavelength loss modulating action using its Nano grade having to being excited in cloth
The multistage stokes light that deep pool scattering generates is modulated respectively to obtain stable Q impulse or mode locking pulse, then will
The Q impulse or mode locking pulse are exported from the fabry perot interferometer end.
2. laser according to claim 1, which is characterized in that the fabry perot interferometer is by the first fiber end face
(6) it is constituted with the second fiber end face (7), and first fiber end face (6) is aligned and with second fiber end face (7) two
There are default spacing between person.
3. laser according to claim 2, which is characterized in that first fiber end face (6) is ordinary optic fibre end face,
Second fiber end face (7) is ordinary optic fibre end face or by surface reflection enhancing treated fiber end face.
4. laser according to claim 2 or 3, which is characterized in that the pumping laser unit include: pumping source (1),
Optical fibre wavelength division multiplexer (2) and gain fibre (3)；
The pumping source (1) is connected with the short wavelength end of the optical fibre wavelength division multiplexer (2), the optical fibre wavelength division multiplexer (2)
Two long wavelength ends be connected respectively with first fiber end face (6) and the gain fibre (3), the gain fibre (3)
It is connected with the fiber bragg grating (5)；
For realizing the importing of pump energy, the optical fibre wavelength division multiplexer (2) is used for pump energy coupling the pumping source (1)
It is incorporated into the straight cavate resonant cavity, and is converted to laser energy by the gain fibre (3), the gain fibre (3) is used for
Realize population inversion.
5. laser according to claim 2, which is characterized in that first fiber end face (6) and second optical fiber
Default spacing between end face (7) is between 5 μm to 1000 μm.
6. according to claim 1 to laser described in 3 any one, which is characterized in that the fiber bragg grating (5)
3dB reflection bandwidth is between 0.5nm and 10nm.
7. laser according to claim 4, which is characterized in that the rare earth ion that the gain fibre (3) is adulterated is
One or more of ytterbium ion, erbium ion and thulium ion.
8. laser according to claim 1, which is characterized in that undoped with gain media in the passive optical fiber (4).
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| CN114018303A (en) * | 2021-11-04 | 2022-02-08 | 天津工业大学 | Novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force |
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| CN110350392A (en) * | 2019-08-02 | 2019-10-18 | 华中科技大学鄂州工业技术研究院 | The changeable device of continuous and pulse based on stimulated Brillouin scattering, method |
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| CN114018303A (en) * | 2021-11-04 | 2022-02-08 | 天津工业大学 | Novel fiber Bragg grating probe for in-situ monitoring of hydraulic shear force |
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