CN106654823B - Pass through the mode locked fiber laser system of collimator wavelength switching - Google Patents
Pass through the mode locked fiber laser system of collimator wavelength switching Download PDFInfo
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- CN106654823B CN106654823B CN201610900597.4A CN201610900597A CN106654823B CN 106654823 B CN106654823 B CN 106654823B CN 201610900597 A CN201610900597 A CN 201610900597A CN 106654823 B CN106654823 B CN 106654823B
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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
-
- 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
-
- 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
Abstract
The present invention provides a kind of mode locked fiber laser systems by graphene reflecting mirror wavelength switching, the system comprises 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 mounts, wherein the graphene saturable absorber is attached at transmission window surface, and the swivel mount for being fixed with the second optical fiber collimator rotates by a certain angle along the direction perpendicular to laser light incident.
Description
Technical field
The present invention relates to laser technology fields, and in particular to a kind of mode locked fiber laser by collimator wavelength switching
System and wavelength switching method.
Background technique
Optical fiber laser has many advantages, such as that small in size, light-weight, high conversion efficiency, quality for outputting laser beam are good, therefore
It is grown rapidly in recent years.Especially mode locked fiber laser due to can ultra-short pulse laser, detection diagnosis, biology 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, has become a hot topic of research, and has important practical application meaning.
The basic principle of passive mode-locking Fiber laser technology is to combine the non-linear effect of the dispersion of optical fiber in resonant cavity, laser
Answer, optical fiber is to the balance between the gain and loss of laser, and by passive mode-locking element to laser intensity or phase
Non-linear absorption effect realize laser PGC demodulation, thus obtain ultra-short pulse laser output.Usually realize passive mode-locking
Fiber laser technology have a technologies such as semiconductor saturable absorbing mirror (SESAM), carbon nanotube (SWNT), but both technologies
All Shortcomings.SESAM complex manufacturing technology, high production cost, saturable absorption spectral region relative narrower.SWNT is because to sharp
Optical wavelength it is selective and cannot be pervasive.Recently, graphene (Graphene) material is found to can be used as novel saturable suction
Acceptor can be used for optical fiber laser mode locking.Graphene is the bi-dimensional cellular shape lattice structure being piled by single layer of carbon atom precision
A kind of carbonaceous new material.As saturated absorbing body, graphene has very wide wavelength wavelength operating range, and makes simple, work
Skill diversification can use the methods of physical mechanical removing and chemical deposition and realize.
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 fiber is made of the lateral anisotropic 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 mode-locked laser of the influence of square, output is more stable.Also, the linearly polarized laser of output has preferably in many fields using valence
Value, such as the fields such as fine micro Process, scientific research.
Summary of the invention
It is different from the above NPR technology and realizes the output of dual wavelength mode-locked laser, it is defeated that the present invention directly passes through adjusting polarization maintaining optical fibre
Laser mode locking output is realized at central wavelength 1532nm and 1558nm respectively in the azimuth of approximate linearly polarized laser out.This hair
It is bright to provide a kind of dual wavelength and adjust more convenient, and it can realize that the ultrashort pulse optical fiber of High Extinction Ratio linearly polarized laser output swashs
Photosystem.Pass through the mode locked fiber laser system and wavelength switching method of collimator wavelength switching
The technical solution of the invention is as follows: passing through a kind of mode-locked fiber lasers by graphene reflecting mirror wavelength switching
Device system, the system comprises sequentially connected pumping source, wavelength-division multiplex optical fiber coupler, er-doped gain fibre, isolator,
One optical fiber collimator, transmission window, graphene saturable absorber, the second optical fiber collimator, output coupler and swivel mount,
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
It rotates by a certain angle in the direction of laser light incident；The pump light come out from pumping source passes through the pumping of wavelength-division multiplex optical fiber coupler
End enters er-doped gain fibre, and the signal light of generation vibrates amplification by isolator counterclockwise and generates into the first optical fiber collimator
It after collimated light, is incident on transmission window, after the absorption of graphene saturable absorber, is incident on the second fiber optic collimator
Device, the rotation of the swivel mount by being fixed with the second optical fiber collimator are fine-tuning from the close of second optical fiber collimator outgoing
The polarization azimuth of liny polarised light, the emergent light outgoing through overregulating enter coupler, separate 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 and tail optical fiber is single mode optical fiber.
Preferably, the output coupler is the polarization-maintaining fiber coupler of export ratio 30:70.
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 for being greater than 90% near infrared band light transmission.
Preferably, the transmission window and graphene saturable absorber are placed on the first optical fiber collimator and the second optical fiber
Collimator, 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 the gold-plated or silvered mirror that reflectivity is greater than 90%.
The invention has the following advantages that
1, the present invention uses ring resonator of the polarization maintaining optical fibre as mode locked fiber laser, realizes that the line of High Extinction Ratio is inclined
The laser that shakes exports.
2, the present invention changes the azimuth of incident laser polarization state, realizes in two by directly adjusting optical fiber collimator
The long laser mode locking output of cardiac wave, structure is simple, operates conveniently.
3, the present invention is reduced the production cost and technique hardly possible 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 subsequent detailed description are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Detailed description of the invention
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, in which:
Fig. 1 is the pulsed optical fibre laser of the invention by the adjustable two central wavelength mode lockings of collimator wavelength switching
The structure chart of system graphene passive mode-locking fiber laser.
Fig. 2 is panda protecting polarized light fiber transversal cross-section structure chart.
Fig. 3 is the mode-locked laser spectrogram for the spectrometer measurement output that resolution ratio is 0.02nm.
The mode-locked laser pulse time-domain diagram that the oscilloscope measurement that Fig. 4 is bandwidth 1GHz exports.
Specific embodiment
Referring to Fig. 1, the present invention provides a kind of by the adjustable two central wavelength mode lockings of collimator wavelength switching
Pulse optical fiber laser system, the system 100 include sequentially connected pumping source 1, wavelength-division multiplex optical fiber coupler 2, er-doped gain
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 6 surface of transmission window.
Wherein, it is 1m that the pump light come out from pumping source 1, which enters length by the pumping end of wavelength-division multiplex optical fiber coupler 2,
Er-doped gain fibre 3, the signal light of the C+L wave band of generation is by the oscillation amplification counterclockwise of isolator 4.Isolator 4 is to up time
The signal light in needle direction is completely isolated, and this design advantage is can to filter out remaining pump light in signal light completely.After isolation
Light enter the first optical fiber collimator 5 generate collimated light after, be incident on transmission window 6, by graphene saturable absorber 7
Absorption after, be incident on the second optical fiber collimator 8.It, can be micro- by being fixed with the rotation of the swivel mount 10 of the second optical fiber collimator 8
Adjust the polarization azimuth for the approximate linearly polarized light being emitted from the second optical fiber collimator 8.Emergent light outgoing through overregulating enters coupling
Clutch.Finally, the laser of mode locking amplification separates the laser output of a certain proportion of power by output coupler 9.
The rotation of swivel mount 10 is controlled by precision three-dimensional translation stage, to realize that laser high coupling efficiency enters optical fiber
Collimator 8.By the fine-tuning approximate linearly polarized light polarization azimuth being emitted from collimator 8 of swivel mount 10, it is equivalent under change
The angle θ in face formula (1), while optical fiber fast axle and slow axis component and phase delay are also changed, it realizes and adjusts at different wave length
The gain and loss of laser.It finally may be implemented at central wavelength 1532nm and 1558nm and realize laser mode locking output respectively most
Afterwards.Fig. 2 is panda protecting polarized light fiber transversal cross-section structure chart.
In formula above, T represents transmission coefficient, and θ represents polarizing angle,Represent analyzing angle, Δ φPC、ΔφLBAnd Δ
φNLRespectively represent bit phase delay, L and B caused by Polarization Controller, fiber birefringence and nonlinear effectmRespectively represent laser
Chamber is long and optical fiber normalizes birefringence.Wherein, the bit phase delay that fiber birefringence causes, can be with the inversely proportional variation of wavelength
Realize filter function.
Preferably, the pumping source 1 includes laser and tail optical fiber is single mode optical fiber；
The er-doped gain fibre is the high concentration polarization-maintaining Er-doped fiber to pump light high-selenium corn ratio.
Preferably, the output coupler is the polarization-maintaining fiber coupler of export ratio 30:70, i.e. the laser of mode locking amplification
The laser output of 30% power is separated by output coupler 7.
Swivel mount 10 is arranged to that one can be rotated along the direction perpendicular to laser light incident along direction shown in FIG. 1
Angle is determined, between angle A as shown in Figure 1, such as ± 30 degree.
The transmission window 6 is the glass planar sheets for being greater than 90% near infrared band light transmission.
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 by used Active Optical Fiber, and covering core diameter is preferably
125 μm, the core diameter of fiber core can select 4 μm, 8 μm or 10 μm, preferably 10/125 μm.It is embodied according to the present invention
Example, the type of optical fiber should match with the pumping wavelength of pumping source 1.
980nm or 1480nm can be used in the matched pumping wavelength of Er-doped fiber institute, further according to wavelength and core diameter parameter
Determine the parameter of wavelength-division multiplex optical fiber coupler 2.The optical maser wavelength being finally emitted 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 selecting core diameter is 10/125 μm of Er-doped fiber as gain media.Pumping source 1 is defeated
Wavelength 976nm out can obtain laser output in the range.If selecting core diameter in experiment is 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 output, can be obtained in the range
Obtain laser output.
As shown in Figure 1, the rotation of swivel mount 10 is controlled by precision three-dimensional translation stage, to realize laser height coupling effect
Rate enters optical fiber collimator 8.Pass through the fine-tuning approximate linearly polarized light polarization azimuth being emitted from collimator 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 between 0.1-2 millimeters respectively, increases the coupling input of the signal light of reflection as far as possible.
The graphene saturated absorbing body 7 can be by mechanically pulling off and single-layer graphene is prepared in the methods of chemical synthesis
Then film is attached to metallic mirror surface by wet process 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 the gold-plated or silvered mirror that reflectivity is greater than 90%.
By the fine-tuning approximate linearly polarized light polarization azimuth being emitted from collimator 8 of swivel mount 10, incident light can be changed
The phase delay at polarization state azimuth and orthogonal polarisation state, the polarised light azimuth of the reflection of the swivel mount 10 as shown in formula (2)
With the phase delay of orthogonal polarisation state and the polarization state relationship of incident light.
tanαr=Pe-iΔφtanαi (2)
In above formula, αrAnd αiThe azimuth of reflection and incident linear polarization laser is respectively indicated, P represents reflection coefficient, Δ
φ represents the phase delay of fast and slow axis.So the polarization of reflected light can be changed by the reflection angle of fine adjustment swivel mount 10
The phase delay of state azimuth and orthogonal polarization components according to formula (1), realizes the gain for adjusting different wave length laser in turn
With loss.Laser mode locking output can be finally realized at central wavelength 1532nm and 1558nm respectively.
Fig. 3 is the mode-locked laser spectrogram for the spectrometer measurement output that resolution ratio is 0.02nm.Fig. 4 is showing for bandwidth 1GHz
The mode-locked laser pulse time-domain diagram of wave device measurement output.
Erbium doped fiber laser according to the present invention can be transmitted through graphene saturated absorbing body so that swivel mount 10 is fine-tuning
The angle that layer is emitted to collimator 8 can be with thus the phase delay at changeable incident light polarization state azimuth and orthogonal polarisation state
Two central wavelength mode lockings of 1532nm and 1558nm are realized, so as to change the laser transmissivity and gain and damage of corresponding wavelength
Consumption realizes different wave length laser amplifier mode locking simultaneously.
Ring resonator of the polarization maintaining optical fibre as mode locked fiber laser is used through the invention, realizes the line of High Extinction Ratio
Polarization laser output；Two central wavelength laser mode locking outputs, structure letter are realized in the azimuth for changing incident laser polarization state
It is single, it operates conveniently；The present invention, as mode-locking device, is reduced the production cost and technique hardly possible using multi-layer graphene saturated absorbing body
Degree, it is easy to accomplish industrialization.
In conjunction with the explanation and practice of the invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (8)
1. a kind of mode locked fiber laser system by collimator wavelength switching, the system comprises sequentially connected pumpings
Source, wavelength-division multiplex optical fiber coupler, er-doped gain fibre, isolator, the first optical fiber collimator, transmission window, graphene can satisfy
With 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 for being fixed with the second optical fiber collimator rotates by a certain angle along the direction perpendicular to laser light incident；
The pump light come out from pumping source enters er-doped gain fibre by the pumping end of wavelength-division multiplex optical fiber coupler, generation
Signal light vibrates counterclockwise by isolator to be amplified into after the first optical fiber collimator generation collimated light, and transmission window is incident on
On, after the absorption of graphene saturable absorber, it is incident on the second optical fiber collimator, by being fixed with the second fiber optic collimator
The polarization azimuth for the approximate linearly polarized light being emitted from second optical fiber collimator is finely tuned in the rotation of the swivel mount of device, is passed through
The emergent light outgoing of adjusting 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
Losing fine includes polarization maintaining optical fibre.
3. mode locked fiber laser system according to claim 1, the pumping source includes laser and tail optical fiber is single mode
Optical fiber.
4. mode locked fiber laser system according to claim 1, the output coupler is the guarantor of export ratio 30:70
Inclined fiber coupler.
5. mode locked fiber laser system according to claim 1, the swivel mount is arranged to along perpendicular to laser light incident
Direction rotate between ± 30 degree.
6. mode locked fiber laser system according to claim 1, the transmission window is near infrared band light transmission
Rate is greater than 90% glass planar sheets.
7. the thickness degree of mode locked fiber laser system according to claim 1, the graphene saturable absorber is
Between 100nm-10um.
8. the thickness degree of mode locked fiber laser system according to claim 7, the graphene saturable absorber is
Between 800nm-1um.
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| 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 |
| 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 |
| 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 |
| 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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| AU2003299854A1 (en) * | 2002-12-20 | 2004-07-22 | Alnaire Laboratories Corporation | Optical pulse lasers |
| CN101611522B (en) * | 2006-09-18 | 2013-04-24 | 康奈尔研究基金会股份有限公司 | All-normal-dispersion femtosecond fiber laser |
| CN101854022B (en) * | 2009-04-03 | 2012-04-04 | 苏州大学 | Passive mode-locking fiber laser with double-wavelength short pulse output |
| CN103647206A (en) * | 2013-11-08 | 2014-03-19 | 华南理工大学 | All-fiber mode-locked laser with high repetition frequency |
| CN103730823A (en) * | 2014-01-08 | 2014-04-16 | 北京工业大学 | Optical reflection type graphene passively Q-switched mode locked laser |
| CN104319617B (en) * | 2014-11-20 | 2017-10-31 | 广东量泽激光技术有限公司 | A kind of adjustable laser of bandwidth and centre wavelength |
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