CN106654823A - Mode-locking fiber laser system capable of switching wavelength through collimators - Google Patents
Mode-locking fiber laser system capable of switching wavelength through collimators Download PDFInfo
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- CN106654823A CN106654823A CN201610900597.4A CN201610900597A CN106654823A CN 106654823 A CN106654823 A CN 106654823A CN 201610900597 A CN201610900597 A CN 201610900597A CN 106654823 A CN106654823 A CN 106654823A
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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
- H01S3/06712—Polarising fibre; Polariser
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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
- 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
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
-
- 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
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Lasers (AREA)
Abstract
The invention provides a mode-locking fiber laser system capable of switching wavelength through graphene reflectors. The system comprises a pumping source, a wavelength division multiplexing fiber coupler, an erbium-doped gain fiber, an isolator, a first fiber collimator, a transmitting window, a graphene saturable absorber, a second fiber collimator, an output coupler and a rotating frame, wherein the graphene saturable absorber is adhered to the surface of the transmitting window; and the rotating frame fixedly provided with the second fiber collimator rotates to a certain angle along the direction vertical to laser incidence.
Description
Technical field
The present invention relates to laser technology field, and in particular to a kind of mode locked fiber laser by collimater wavelength switching
System and wavelength changing method.
Background technology
Optical fiber laser has the advantages that small volume, lightweight, high conversion efficiency, quality for outputting laser beam are good, therefore
Fast development is obtained in recent years.Particularly mode locked fiber laser due to can ultra-short pulse laser, in detection diagnosis, biological doctor
The various fields such as medicine, super micro-processing and military affairs have wide prospect.Mode-locking technique can be divided mainly into active mode locking, passive lock
Mould, self-locking mode and mixed mode-locking technology.Wherein passive mode-locking technology is not due to needing extraneous additional modulation source, it is easy to accomplish Quan Guang
The advantage of fibrillation, becomes the focus of research, there is important practical application meaning.
The general principle of passive mode-locking Fiber laser technology is dispersion, the non-linear effect of laser for combining optical fiber in resonator
Should, optical fiber to the balance between the gain and loss of laser, and through passive mode-locking element to laser intensity or phase place
Non-linear absorption effect realize the PGC demodulation of laser, so as to obtain ultra-short pulse laser output.It is typically implemented passive mode-locking
Fiber laser technology have a technologies such as semiconductor saturable absorbing mirror (SESAM), CNT (SWNT), but both technologies
All Shortcomings.SESAM complex manufacturing technologies, production cost are high, saturable absorption spectral region relative narrower.SWNT is because to swashing
Optical wavelength it is selective and can not be pervasive.Recently, Graphene (Graphene) material is found to can be used as new saturable suction
Acceptor, can be used for optical fiber laser locked mode.Graphene is the bi-dimensional cellular shape lattice structure being piled into by individual layer carbon atom precision
A kind of carbonaceous new material.Used as saturated absorbing body, Graphene has very wide wavelength wavelength operating range, and makes simple, work
Skill variation, it is possible to use the method such as physical mechanical stripping and chemical deposition is realized.
The inclined mode locked fiber laser of all risk insurance can be achieved on the laser system of linear polarization ultra-short pulse laser output, laser cavity
Interior gain fibre and Transmission Fibers is made up of the horizontal heterotropic optical fiber of refractive index, such as panda optic fibre etc..Relative to common
Mode locked fiber laser, the fiber birefringence feature of the inclined mode locked fiber laser of all risk insurance is because being not easily susceptible to ambient temperature and power
The impact of square, the mode-locked laser of output is more stable.Also, the linearly polarized laser for exporting has in many fields and preferably apply valency
The fields such as value, such as fine micro Process, scientific research.
The content of the invention
It is different from above NPR technology and realizes that dual wavelength mode-locked laser is exported, the present invention is directly defeated by adjusting polarization maintaining optical fibre
Realize that laser mode locking is exported at centre wavelength 1532nm and 1558nm respectively in the azimuth of the approximate linearly polarized laser for going out.This
It is bright to adjust more convenient there is provided a kind of dual wavelength, and it is sharp to be capable of achieving the ultrashort pulse optical fiber of High Extinction Ratio linearly polarized laser output
Photosystem.By the mode locked fiber laser system and wavelength changing method of collimater wavelength switching
The present invention technical solution be：By a kind of mode-locked fiber lasers by Graphene speculum wavelength switching
Device system, pumping source that the system includes being sequentially connected, wavelength-division multiplex optical fiber coupler, er-doped gain fibre, isolator, the
One optical fiber collimator, transmission window, Graphene saturable absorber, the second optical fiber collimator, output coupler and swivel mount, its
Described in Graphene saturable absorber be attached at transmission window surface, be fixed with the swivel mount of the second optical fiber collimator along vertical
Rotate to an angle in the direction of laser light incident；From the pumping that pumping source pump light out passes through wavelength-division multiplex optical fiber coupler
End enters er-doped gain fibre, and the flashlight of generation vibrates counterclockwise amplification and generates into the first optical fiber collimator through isolator
After collimated light, incide on transmission window, after the absorption of Graphene saturable absorber, incide the second fiber optic collimator
Device, the rotation of the swivel mount by being fixed with the second optical fiber collimator is fine-tuning from the near of the second optical fiber collimator outgoing
The polarization azimuth of liny polarised light, the emergent light outgoing through adjusting enters coupler, separates swashing for a certain proportion of power
Light output.
Preferably, the signal transmission fiber in the wavelength-division multiplex optical fiber coupler includes polarization maintaining optical fibre.
Preferably, the pumping source includes laser instrument and tail optical fiber is single-mode fiber.
Preferably, the output coupler is export ratio 30:70 polarization-maintaining fiber coupler.
Preferably, the swivel mount is arranged to rotate between ± 30 degree along the direction perpendicular to laser light incident.
Preferably, the transmission window is the glass planar sheets near infrared band light transmission more than 90%.
Preferably, the transmission window and Graphene saturable absorber are placed on the first optical fiber collimator and the second optical fiber
Collimater, interval therebetween is respectively between 0.1-2 millimeters.
Preferably, the thickness degree of the Graphene saturable absorber is between 100nm-10um
Preferably, the thickness degree of the Graphene saturable absorber is between 800nm-1um.
Preferably, the metallic mirror is gold-plated or silvered mirror of the reflectivity more than 90%.
The present invention has advantages below：
1st, the present invention realizes that the line of High Extinction Ratio is inclined using polarization maintaining optical fibre as the ring resonator of mode locked fiber laser
The laser that shakes is exported.
2nd, the present invention changes the azimuth of incident laser polarization state by directly adjusting optical fiber collimator, realizes in two
The long laser mode locking output of cardiac wave, simple structure, operation facility.
3rd, the present invention reduces cost of manufacture and technique is difficult using multi-layer graphene saturated absorbing body as mode-locking device
Degree, it is easy to accomplish industrialization.
It should be appreciated that aforementioned description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the restriction to claimed content of the invention.
Description of the drawings
With reference to the accompanying drawing enclosed, the present invention more purpose, function and advantages are by by the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 is the pulsed optical fibre laser by the adjustable two centre wavelength locked modes of collimater wavelength switching of the present invention
The structure chart of system Graphene passive mode-locking fiber laser.
Fig. 2 is panda protecting polarized light fiber lateral cross section structure chart.
Fig. 3 is the mode-locked laser spectrogram that resolution ratio is exported for the spectrometer measurement of 0.02nm.
The mode-locked laser pulse time-domain diagram that Fig. 4 is exported for the oscilloscope measurement of bandwidth 1GHz.
Specific embodiment
Referring to Fig. 1, the invention provides a kind of by the adjustable two centre wavelength locked modes of collimater wavelength switching
Pulse optical fiber laser system, the system 100 includes pumping source 1, the wavelength-division multiplex optical fiber coupler 2, er-doped gain being sequentially connected
Optical fiber 3, isolator 4, the first optical fiber collimator 5, transmission window 6, Graphene saturable absorber 7, the second optical fiber collimator 8,
Output coupler 9 and swivel mount 10.Wherein Graphene saturable absorber 7 is attached at the surface of transmission window 6.
Wherein, it is 1m that the pump light from pumping source 1 out enters length by the pumping end of wavelength-division multiplex optical fiber coupler 2
Er-doped gain fibre 3, counterclockwise vibration is amplified through isolator 4 for the flashlight of the C+L wave bands of generation.Isolator 4 is to up time
The flashlight in pin direction is completely isolated, and this design advantage can be to filter remaining pump light in flashlight completely.After isolation
Light enter the first optical fiber collimator 5 generate collimated light after, incide on transmission window 6, through Graphene saturable absorber 7
Absorption after, incide the second optical fiber collimator 8.By the rotation for being fixed with the swivel mount 10 of the second optical fiber collimator 8, can be micro-
Adjust the polarization azimuth from the approximate linearly polarized light of the outgoing of the second optical fiber collimator 8.Emergent light outgoing through adjusting enters coupling
Clutch.Finally, the laser that locked mode amplifies separates the laser output of a certain proportion of power through output coupler 9.
The rotation of swivel mount 10 is controlled by precision three-dimensional translation stage, so as to realize that laser high coupling efficiency enters optical fiber
Collimater 8.By the fine-tuning approximate linearly polarized light polarization azimuth from the outgoing of collimater 8 of swivel mount 10, equivalent under change
θ angles in face formula (1), while have also been changed optical fiber fast axle and slow axis component and phase delay, realize adjusting at different wave length
The gain of laser and loss.Finally may be implemented in and realize respectively at centre wavelength 1532nm and 1558nm laser mode locking output most
Afterwards.Fig. 2 is panda protecting polarized light fiber lateral cross section structure chart.
In formula above, T represents transmission coefficient, and θ represents polarizing angle,Represent analyzing angle, Δ φPC、ΔφLBAnd Δ
φNLThe bit phase delay that Polarization Controller, fiber birefringence and nonlinear effect cause, L and B are represented respectivelymLaser is represented respectively
Chamber length and optical fiber normalization birefringence.Wherein, the bit phase delay that fiber birefringence causes, can be with the inversely proportional change of wavelength
Realize filter function.
Preferably, the pumping source 1 includes laser instrument and tail optical fiber is single-mode fiber；
The er-doped gain fibre is that the high concentration to pump light high-selenium corn ratio protects inclined Er-doped fiber.
Preferably, the output coupler is export ratio 30:The laser that 70 polarization-maintaining fiber coupler, i.e. locked mode amplify
The laser output of 30% power is separated through output coupler 7.
Swivel mount 10 is arranged to that one can be rotated along the direction perpendicular to laser light incident along the direction shown in Fig. 1
Determine angle, angle A as shown in Figure 1, such as between ± 30 degree.
The transmission window 6 is the glass planar sheets near infrared band light transmission more than 90%.
Preferably, the signal transmission fiber in wavelength-division multiplex optical fiber coupler includes polarization maintaining optical fibre.
According to the present invention, the core diameter of er-doped gain fibre 3 is determined that covering core diameter is preferably by the Active Optical Fiber for being adopted
125 μm, the core diameter of fiber core can select 4 μm, 8 μm or 10 μm, preferably 10/125 μm.It is embodied as according to the present invention
Example, the type of optical fiber should match with the pumping wavelength of pumping source 1.
The pumping wavelength that Er-doped fiber is matched can adopt 980nm or 1480nm, further according to wavelength and core diameter parameter
Determine the parameter of wavelength-division multiplex optical fiber coupler 2.The optical maser wavelength of final outgoing in the certain gain ranging of Active Optical Fiber (such as
1530-1560nm) determined by the reflection wavelength of bragg grating.The typical exit wavelength of Er-doped fiber is 1064nm.
For example, in the present embodiment, if from core diameter be 10/125 μm of Er-doped fiber as gain media.Pumping source 1 is defeated
Go out wavelength 976nm, can within the range obtain laser output.If in experiment from core diameter be 10/125 μm of Er-doped fiber as increasing
Beneficial medium, the tail optical fiber of pumping source 1 need to choose same model core diameter.Pumping source 1 is 915nm single-mode outputs, can be obtained within the range
Obtain laser output.
As shown in figure 1, the rotation of swivel mount 10 is controlled by precision three-dimensional translation stage, so as to realize the high coupling effect of laser
Rate enters optical fiber collimator 8.By the fine-tuning approximate linearly polarized light polarization azimuth from the outgoing of collimater 8 of swivel mount 10.
Transmission window 6 and Graphene saturable absorber 7 are placed on the first optical fiber collimator 5 and the second optical fiber collimator 8,
Interval therebetween is for example spaced in respectively the coupling input of the flashlight for increasing reflection between 0.1-2 millimeters as far as possible.
The Graphene saturated absorbing body 7 can be by mechanically pulling off and the method such as chemical synthesis prepares single-layer graphene
Film, is then attached to metallic mirror surface by wet method transfer or dry method transfer etc., can prepare 5-10 layers by the method for being layering
Graphene saturated absorbing body.The thickness degree of Graphene saturable absorber 6 is, for example, between 100nm-10um, preferably in 800nm-
Between 1um.
The metallic mirror is gold-plated or silvered mirror of the reflectivity more than 90%.
By the fine-tuning approximate linearly polarized light polarization azimuth from the outgoing of collimater 8 of swivel mount 10, incident light can be changed
Polarization state azimuth and the phase delay of orthogonal polarisation state, the polarised light azimuth of the reflection of swivel mount 10 as shown in formula (2)
With the phase delay and the polarization state relationship of incident light of orthogonal polarisation state.
tanαr=Pe-iΔφtanαi (2)
In above formula, αrAnd αiThe azimuth of reflection and incident linear polarization laser is represented respectively, and P represents reflectance factor, Δ
φ represents the phase delay of fast and slow axis.So, by the reflection angle of fine adjustment swivel mount 10, the polarization of reflected light can be changed
State azimuth and the phase delay of orthogonal polarization components, and then, according to formula (1), realize adjusting the gain of different wave length laser
With loss.Finally can realize that laser mode locking is exported at centre wavelength 1532nm and 1558nm respectively.
Fig. 3 is the mode-locked laser spectrogram that resolution ratio is exported for the spectrometer measurement of 0.02nm.Fig. 4 shows for bandwidth 1GHz
The mode-locked laser pulse time-domain diagram of ripple device measurement output.
Erbium doped fiber laser of the invention can be transmitted through Graphene saturated absorbing body so that swivel mount 10 is fine-tuning
Layer to the outgoing of collimater 8 angle, so as to the phase delay at incident light polarization state azimuth and orthogonal polarisation state can be changed, can be with
Two centre wavelength locked modes of 1532nm and 1558nm are realized, such that it is able to change the laser transmissivity and gain and damage of corresponding wavelength
Consumption, realizes different wave length laser amplifier locked mode simultaneously.
The line of High Extinction Ratio is realized as the ring resonator of mode locked fiber laser using polarization maintaining optical fibre by the present invention
Polarization laser is exported；Change the azimuth of incident laser polarization state, realize two centre wavelength laser mode locking outputs, structure letter
It is single, operation facility；The present invention, as mode-locking device, is reduced cost of manufacture and technique is difficult using multi-layer graphene saturated absorbing body
Degree, it is easy to accomplish industrialization.
With reference to the explanation of the invention and practice that disclose here, the other embodiment of the present invention is for those skilled in the art
All will be readily apparent and understand.Illustrate and embodiment be to be considered only as it is exemplary, the present invention true scope and purport it is equal
It is defined in the claims.
Claims (10)
1. a kind of mode locked fiber laser system by Graphene speculum wavelength switching, the system includes what is be sequentially connected
Pumping source, wavelength-division multiplex optical fiber coupler, er-doped gain fibre, isolator, the first optical fiber collimator, transmission window, Graphene
Saturable absorber, the second optical fiber collimator, output coupler and swivel mount, wherein
The Graphene saturable absorber is attached at transmission window surface,
The swivel mount edge for being fixed with the second optical fiber collimator rotates to an angle perpendicular to the direction of laser light incident；
Er-doped gain fibre is entered by the pumping end of wavelength-division multiplex optical fiber coupler from pumping source pump light out, generation
Flashlight vibrates counterclockwise amplification into after the first optical fiber collimator generation collimated light through isolator, incides transmission window
On, after the absorption of Graphene saturable absorber, the second optical fiber collimator is incided, by being fixed with the second fiber optic collimator
The rotation of the swivel mount of device, the polarization azimuth of the fine-tuning approximate linearly polarized light from the second optical fiber collimator outgoing, Jing
The emergent light outgoing overregulated enters coupler, separates the laser output of a certain proportion of power.
2. mode locked fiber laser system according to claim 1, the signal in the wavelength-division multiplex optical fiber coupler is passed
Lose fine including polarization maintaining optical fibre.
3. mode locked fiber laser system according to claim 1, the pumping source includes laser instrument and tail optical fiber is single mode
Optical fiber.
4. mode locked fiber laser system according to claim 1, the output coupler is export ratio 30:70 guarantor
Inclined fiber coupler.
5. mode locked fiber laser system according to claim 1, the swivel mount is arranged to can be along perpendicular to laser
Incident direction is rotated between ± 30 degree.
6. mode locked fiber laser system according to claim 6, the transmission window is near infrared band light transmission
Glass planar sheets of the rate more than 90%.
7. mode locked fiber laser system according to claim 1, the transmission window and Graphene saturable absorber
The first optical fiber collimator and the second optical fiber collimator are placed on, interval therebetween is respectively between 0.1-2 millimeters.
8. mode locked fiber laser system according to claim 1, the thickness degree of the Graphene saturable absorber is
Between 100nm-10um.
9. mode locked fiber laser system according to claim 8, the thickness degree of the Graphene saturable absorber is
Between 800nm-1um.
10. mode locked fiber laser system according to claim 1, the metallic mirror is that reflectivity is more than 90%
Gold-plated or silvered mirror.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800035A (en) * | 2017-11-14 | 2018-03-13 | 北京信息科技大学 | A kind of changeable mode-locked fiber lasers device of wavelength |
| CN108631147A (en) * | 2018-04-21 | 2018-10-09 | 华南理工大学 | Wavelength adjustable method synchronous with repetition rate is realized in laser with active-passive lock mould |
| CN108649418A (en) * | 2018-06-22 | 2018-10-12 | 天津欧泰激光科技有限公司 | Can self-starting Spectral Broadening and offset filtering mode-locked laser |
| CN110907920A (en) * | 2018-09-18 | 2020-03-24 | 中国北方车辆研究所 | Indoor passive laser ranging simulation device and ranging capability detection method |
| US11471078B1 (en) | 2019-10-30 | 2022-10-18 | Brigham Young University | Miniaturized spectrometers for wearable devices |
| US11589764B1 (en) | 2019-10-30 | 2023-02-28 | Brigham Young University | Methods and devices for aligning miniaturized spectrometers and impedance sensors in wearable devices |
| US11630316B1 (en) | 2019-10-30 | 2023-04-18 | Brigham Young University | Miniaturized collimators |
| US11877845B1 (en) | 2019-10-30 | 2024-01-23 | Brigham Young University | Miniaturized spectrometers on transparent substrates |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800035A (en) * | 2017-11-14 | 2018-03-13 | 北京信息科技大学 | A kind of changeable mode-locked fiber lasers device of wavelength |
| CN108631147A (en) * | 2018-04-21 | 2018-10-09 | 华南理工大学 | Wavelength adjustable method synchronous with repetition rate is realized in laser with active-passive lock mould |
| CN108631147B (en) * | 2018-04-21 | 2019-08-20 | 华南理工大学 | Wavelength adjustable method synchronous with repetition rate is realized in laser with active-passive lock mould |
| WO2019200886A1 (en) * | 2018-04-21 | 2019-10-24 | 华南理工大学 | Method for realizing synchronous tuning of wavelength and repetition frequency in passive mode-locking laser |
| CN108649418A (en) * | 2018-06-22 | 2018-10-12 | 天津欧泰激光科技有限公司 | Can self-starting Spectral Broadening and offset filtering mode-locked laser |
| CN108649418B (en) * | 2018-06-22 | 2024-02-02 | 天津欧泰激光科技有限公司 | Self-starting nonlinear spectrum broadening and offset filtering mode-locked laser |
| CN110907920A (en) * | 2018-09-18 | 2020-03-24 | 中国北方车辆研究所 | Indoor passive laser ranging simulation device and ranging capability detection method |
| CN110907920B (en) * | 2018-09-18 | 2023-10-27 | 中国北方车辆研究所 | Indoor passive laser ranging simulation device and ranging capability detection method |
| US11471078B1 (en) | 2019-10-30 | 2022-10-18 | Brigham Young University | Miniaturized spectrometers for wearable devices |
| US11589764B1 (en) | 2019-10-30 | 2023-02-28 | Brigham Young University | Methods and devices for aligning miniaturized spectrometers and impedance sensors in wearable devices |
| US11630316B1 (en) | 2019-10-30 | 2023-04-18 | Brigham Young University | Miniaturized collimators |
| US11877845B1 (en) | 2019-10-30 | 2024-01-23 | Brigham Young University | Miniaturized spectrometers on transparent substrates |
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