CN109038191A - It is a kind of to compose limited Fourier mode locked fiber laser - Google Patents
It is a kind of to compose limited Fourier mode locked fiber laser Download PDFInfo
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- CN109038191A CN109038191A CN201810943882.3A CN201810943882A CN109038191A CN 109038191 A CN109038191 A CN 109038191A CN 201810943882 A CN201810943882 A CN 201810943882A CN 109038191 A CN109038191 A CN 109038191A
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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
- H01S3/10—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
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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
- H01S3/1121—Harmonically mode locking lasers, e.g. modulation frequency equals multiple integers or a fraction of the resonator roundtrip time
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Abstract
Limited Fourier mode locked fiber laser is composed the invention discloses a kind of, it provides optical gain amplification mechanism by optical gain module for the normal operation of laser, optical circulator couples saturable absorber, saturable absorber can realize the self-starting modelocking of laser, energy compress line width simultaneously, to obtain ultrashort laser pulse, by Polarization Controller, change the local polarization state of optical path inside laser, by introducing dispersion management time delay module, it can be to provide dispersion management mechanism inside laser resonant cavity, increase the detour time of endovenous laser, reduce laser resonator frequency, simultaneously, setting length scanning driving signal frequency matches with laser cavity resonance frequency, so that each scanning wavelength laser detours one week when returning to length scanning module in Fourier domain mode-locking laser cavity and its wave transparent is long consistent, just may be used Again by.Mode locked fiber laser of the invention can realize the advantages such as high wavelength scan frequency, burst pulse line width and ultrashort laser pulsewidth.
Description
Technical field
The invention belongs to optical-fiber laser, ultra-fast optical and non-linear optical fields, and especially high-speed discrete scanning is super
Short mode-locked laser pulse phenomenon, the fields such as wideband WDM fiber optic communication, Fibre Optical Sensor have outstanding researching value and
Potential application composes limited Fourier mode locked fiber laser more particularly, to a kind of.
Background technique
Wavelength is a fundamental physical quantity and photoelectric information technology and its related fields one important application dimension for light
Degree, may be implemented the high speed optical communication and sensing network of vast capacity accordingly.Distributed sensing field and coherence imaging system
In, Fourier mode locked fiber laser can produce the pulse laser of higher scan frequency, and signal demodulation ability has spy
Different application potential.Traditional tunable optical fiber laser is compared, Fourier mode locked fiber laser has wider spectrum
Bandwidth, higher working frequency and shorter pulse width, it is very crucial to above-mentioned application as extraordinary laser light source, have non-
Often important research significance and application value.
Commercial tunable optical fiber laser main at present realizes the adjusting of central wavelength using automatically controlled tunable filter, this
Kind method has not only broken up the laser resonator structure of all -fiber, while limiting tuning speed, tuning range and laser
Performance.Traditional Fourier mode locked fiber laser herein basis on improve working frequency, improve beam quality, but
It is that energy of lasers has been dispersed in the continuous wave in broadband, spectrum is determined by frescan.Therefore limited Fourier mode locking is composed
Optical fiber laser is higher to the utilization efficiency of energy as upgrading scheme, simultaneously because the mechanism of Wavelengths Twice selection is introduced,
So that laser has the ability that signal accurately demodulates, distinctive application potential is played.
In conclusion commercialization tunable laser structure is generally based on tunable filter realization length scanning at this stage,
Its scanning speed is slow, beam quality is not high, function is less, applicable surface is limited.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, limited Fourier mode locking light is composed the present invention provides a kind of
Fibre laser, thus the technical issues of solution conventional Fourier domain mode locked fiber laser limited performance.
To achieve the above object, limited Fourier mode locked fiber laser is composed the present invention provides a kind of, comprising: the ring of light
Shape device, Polarization Controller, saturable absorber, length scanning drive module, dispersion management time delay module, optical gain module and
Output module；
The first port of the optical circulator is connected with the first end of the Polarization Controller, and the second of the optical circulator
Port is connected with the saturable absorber, and the third port of the optical circulator is connected with the first end of the output module；
The second end of the Polarization Controller is connected with the first end of the length scanning drive module；The length scanning drive module
Second end connect with the first end of the dispersion management time delay module, the second end of the dispersion management time delay module with it is described
The first end of optical gain module connects, and the second end of the optical gain module is connect with the second end of the output module；
The optical gain module provides light for injecting pump energy for laser for the normal operation of laser
Learn gain amplification mechanism；
The optical circulator described can satisfy for the input light of the first port to be transmitted to by the second port
After absorber, the output light of the saturable absorber is fed to the third port from the second port；
The saturable absorber, for realizing the self-starting modelocking of laser, while can compress line width, from
And obtain ultrashort laser pulse；
The Polarization Controller, for changing the local polarization state of laser inside optical path, to realize laser pulse
Mode locking operating and the adjusting and switching of mode-lock status；
The dispersion management time delay module increases the detour time of laser, reduces laser for providing dispersion management mechanism
Device resonance frequency；
The length scanning drive module is used for generation wavelength scanning drive signal, and is driven using the length scanning
Signal is filtered scanning to laser pulse wavelength, finally from the ultrashort Fourier lock of output module output high speed frequency sweep
Mould pulse, wherein the frequency of the length scanning driving signal and the work base chamber resonance frequency of laser match.
Preferably, the length scanning drive module includes: that mould occurs for length scanning module and length scanning driving signal
Block；
Module occurs for the length scanning driving signal, for generating work base chamber resonance frequency phase of the frequency with laser
Matched length scanning driving signal, and drive the length scanning module to laser arteries and veins based on the length scanning driving signal
It rushes wavelength and is filtered scanning, so that the Resonant Intake System of laser follows work repetition rate mechanical periodicity.
Preferably, it includes: waveform generating module, coding control module and frequency that module, which occurs, for the length scanning driving signal
Compose collection analysis module；
The Spectral acquisition analysis module will analyze number for acquiring and analyzing the work base chamber repetition rate of laser
According to being transferred to the coding control module；
The coding control module, the work base chamber frequency of the laser for being uploaded according to the Spectral acquisition analysis module
Rate data are encoded, and the control code that compiling is completed is transmitted to the waveform generating module；
The waveform generating module, the control code for being conveyed according to the coding control module generate corresponding frequencies and wave
The length scanning driving signal of shape introduces negative feedback mechanism for laser stabilization operation.
Preferably, the working method of the length scanning module is voltage driving, is made of sensitive piezoelectric ceramics, scanning side
Formula is discrete scanning, when work, piezoelectric ceramics according to the voltage signal that the length scanning driving signal demodulates adjust from
Body vibrant characteristic, so that the Resonant Intake System of laser follows work repetition rate cyclic dispersion to change, and then to optical maser wavelength
Discrete scanning is carried out, final output periodically composes limited discrete wavelength laser pulse.
Preferably, the working method of the saturable absorber is passive reflective, and structure is in semiconductor mirror
Upper grow has the semiconductive thin film of saturable absorption property, when work, under strong light, and the saturable absorber excitation bleaching
Effect, most of light energy lossless can reach the semiconductor mirror surface through semiconductive thin film, be reflected back again later
In laser；Under dim light, the saturable absorber embodies unsaturated absorption characteristic, and dim light is absorbed loss, and then makes
Pulsewidth is obtained to become narrow gradually.
Preferably, the dispersion management time delay module adjusts the time delay introduced to incident light pulse by dispersive medium, makes
Laser pulse circulation time extension in laser is obtained, work repetition rate is reduced, matches the scanning frequency of the length scanning module
Rate, while dispersion management is carried out to each discrete wavelength component laser, so that each discrete wavelength component laser obtains identical chamber
Interior circulation time.
Preferably, the laser further include: the first optoisolator and the second optoisolator；
First optoisolator is connect with the optical gain module and the output module respectively, second light every
It is connect respectively with the optical gain module and the dispersion management time delay module from device；
First optoisolator and second optoisolator are used to keep the one-way transmission of laser inner laser,
The influence of disturbance factor is reduced simultaneously.
Preferably, the output module includes: photo-coupler；
The first port of the photo-coupler is connect with the third port of the optical circulator, the third of the photo-coupler
Port is connect with second optoisolator, and the second port of the photo-coupler is 10% light splitting ratio port, for coupling
Mode-locked laser pulse is exported, external test facility, the third of the first port of the photo-coupler and the photo-coupler are connected
It is 90% that port, which is divided ratio,.
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 present invention is increased by dispersion management time delay module, the detour time of endovenous laser, laser resonator frequency
It is lowered, so that length scanning driving signal occurs module, the frequency of length scanning module and laser cavity resonance frequency and matches,
Each scanning wavelength laser detours one week when returning to length scanning module in Fourier domain mode-locking laser cavity at this time and its wave transparent grows one
It causes, it just can be again by into a kind of quasi-static frequency sweep mode, that is, Fourier domain mode-locking working condition, each wavelength laser energy
It is stored in dispersion management time delay module, it can be achieved that advantages such as high wavelength scan frequency, burst pulse line width, ultrashort laser pulsewidths.
2, structure of the invention is all optical fibre structure, is not necessarily to any filtered external device or tuning device, has light beam matter
Measure, electromagnetism interference, high conversion efficiency, stability are good, realizability is high, it is compact-sized, low in cost, be easy to radiate and tie up
Protect various features.
3, the ultrashort Mode-locked laser of ultrashort pulse, output picosecond or subpicosecond time frame, can be used as high-quality ultrafast
Seed light source.
4, high speed frequency sweep, it is widely applicable from band signal demodulation ability, there is scientific research meaning abundant and engineer application
Value.
5, wide-band tuning range can be achieved, strong flexibility can be applied to many necks such as broadband, high speed fibre distributed sensing
Domain.
Detailed description of the invention
Fig. 1 is a kind of laser structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram that module occurs for a kind of length scanning driving signal provided in an embodiment of the present invention；
Fig. 3 is a kind of wavelength surface sweeping schematic diagram provided in an embodiment of the present invention；
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1 for optical circulator,
2 it is Polarization Controller, 3 be saturable absorber, 4 be length scanning module, 5 is that length scanning driving signal occurs module, 6 is
Dispersion management time delay module, 7 be the first optoisolator, 8 be optical gain module, 9 be the second optoisolator, 10 be optical coupling
Device, 11 be waveform generating module, 12 be coding control module, 13 be Spectral acquisition analysis module.
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 " and " third " in description and claims of this specification etc. are for distinguishing not
Same object, not for description particular order.
The invention proposes a kind of tunable wave length, the high ultrafast spectrum of sweep velocity is limited Fourier mode-locked fiber lasers
Device comprising length scanning driving signal occurs module and by optical gain module, optoisolator, dispersion management delay mould
The loop laser that block, length scanning module, Polarization Controller, photo-coupler, optical circulator, saturable absorber are formed by connecting is humorous
Shake chamber.The spectrum is limited Fourier mode locked fiber laser and is selected by discrete wavelength scanning technique scanning wavelength,
When the length scanning driving signal frequency of load is base chamber frequency integral multiple, corresponding selection wavelength starting of oscillation is finally only coupled defeated
The ultrashort mode-locked laser pulse of specific wavelength out shows as periodic pulse train in time domain, is discrete spectrum sequence on frequency spectrum.
Mainstream conventional Fourier domain mode-locking laser is compared, which, which is limited Fourier mode locked fiber laser, can realize high length scanning
The advantages such as frequency, burst pulse line width, ultrashort laser pulsewidth, spectral domain wavelength and time-domain pulse train have corresponding relationship, this
Characteristic make spectrum of the invention be limited Fourier mode locked fiber laser can advantageously demodulate time-domain signal, Fibre Optical Sensor,
The fields such as imaging possess excellent application prospect.It is used in conclusion spectrum of the invention is limited Fourier mode locked fiber laser
It is convenient, more without collimating, building simple, beam quality height, function, it is capable of providing high-velocity scanning, ultrashort pulse, super-narrow line width
Soliton pulse laser, have compared with current mainstream scheme compact light channel structure, output characteristics abundant and multiplicity answer
With function, has high value of practical in the scientific researches such as sensing technology and the weak coherent imaging of optics and engineer application field.Expand
The application flexibility for opening up the field optical fiber laser constructs high speed frequency sweep mode-locked fiber lasers solution.
It is as shown in Figure 1 that a kind of structure for composing limited Fourier mode locked fiber laser provided in an embodiment of the present invention is shown
It is intended to, comprising: optical circulator 1, Polarization Controller 2, saturable absorber 3, length scanning drive module, dispersion management delay mould
Block 6, optical gain module 8 and output module；
Optical circulator 1 is the optic path element of nonreciprocity one-way circulation, first port 1a and Polarization Controller 2
First end be connected, the second port 1b of optical circulator 1 is connected with saturable absorber 3, the third port 1c of optical circulator 1 with it is defeated
The first end of module is connected out；The second end of Polarization Controller 2 is connected with the first end of length scanning drive module；Length scanning
The second end of drive module is connect with the first end of dispersion management time delay module 6, the second end and light of dispersion management time delay module 6
The first end connection of gain module 8 is learned, the second end of optical gain module 8 and the second end of output module connect；
Optical gain module 8 provides optics increasing for injecting pump energy for laser for the normal operation of laser
Beneficial amplification mechanism；
Specifically, the internal optics pumping of optical gain module 8 provides lasting energy injection, gain media for laser
It absorbs pumping light power and gain amplification is carried out to module input light, by module amplification, shaping, restore swashing for output intensity amplification
Light pulse when work, adjusts optical pumping intensity to control optical gain size, changes Mode-locking For Lasers working condition,
In, pumping source is the laser diode of electric current driving, when work, driving current size is adjusted and is adjusted in synchronism output pump light function
Rate size realizes the regulation of laser performance parameter.
Optical circulator 1, for the input light of first port 1a to be transmitted to saturable absorber 3 by second port 1b
Afterwards, the output light of saturable absorber 3 is fed to third port 1c from second port 1b；Saturable absorber 3, for realizing
The self-starting modelocking of laser, while energy compress line width, to obtain ultrashort laser pulse；Polarization Controller 2 is used
In change laser inside optical path local polarization state, with realize laser pulse mode locking operating and mode-lock status adjusting and
Switching；Dispersion management time delay module 6 increases the detour time of laser, reduces laser resonator for providing dispersion management mechanism
Frequency；Length scanning drive module is used for generation wavelength scanning drive signal, and using length scanning driving signal to laser arteries and veins
It rushes wavelength and is filtered scanning, finally from the ultrashort Fourier mode locking pulse of output module output high speed frequency sweep, wherein wavelength
The frequency of scanning drive signal and the work base chamber resonance frequency of laser match.
In embodiments of the present invention, length scanning drive module includes: length scanning module 4 and length scanning driving signal
Module 5 occurs；
Module 5 occurs for length scanning driving signal, for generating work base chamber resonance frequency phase of the frequency with laser
The length scanning driving signal matched, and based on length scanning driving signal driving length scanning module 4 to laser pulse wavelength into
Row filter scan, so that the Resonant Intake System of laser follows work repetition rate mechanical periodicity.
In embodiments of the present invention, it includes: waveform generating module 11, coding control that module 5, which occurs, for length scanning driving signal
Molding block 12 and Spectral acquisition analysis module 13；
Spectral acquisition analysis module 13 will analyze data for acquiring and analyzing the work base chamber repetition rate of laser
It is transferred to coding control module 12；Coding control module 12, laser for being uploaded according to Spectral acquisition analysis module 13
Work base chamber frequency data are encoded, and the control code that compiling is completed is transmitted to waveform generating module 11；Mould occurs for waveform
Block 11, the control code for being conveyed according to coding control module 12 generate the length scanning driving signal of corresponding frequencies and waveform,
Negative feedback mechanism is introduced for laser stabilization operation.
In embodiments of the present invention, the working method of length scanning module 4 is voltage driving, by sensitive piezoelectric ceramics structure
It is discrete scanning at, scanning mode, when work, voltage signal tune that piezoelectric ceramics wavelength basis scanning drive signal demodulates
Self vibration characteristic is saved, so that the Resonant Intake System of laser follows work repetition rate cyclic dispersion to change, and then to laser
Wavelength carries out discrete scanning, and final output periodically composes limited discrete wavelength laser pulse.
In embodiments of the present invention, the working method of saturable absorber 3 is passive reflective, and structure is in semiconductor
Growth has the semiconductive thin film of saturable absorption property on reflecting mirror, and when work, under strong light, saturable absorber 3 is excited
Bleaching effect, most of light energy lossless can reach semiconductor mirror surface through semiconductive thin film, be reflected back again later
In laser；Under dim light, saturable absorber 3 embodies unsaturated absorption characteristic, and dim light is absorbed loss, due to absorbing
Pulse front edge, pulsewidth can become narrow gradually.
In embodiments of the present invention, dispersion management time delay module 6 introduces incident light pulse by dispersive medium adjusting
Time delay, so that laser pulse circulation time extension in laser, reduces work repetition rate, matching length scanning module 4 is swept
Frequency is retouched, while dispersion management is carried out to each discrete wavelength component laser, so that the acquisition of each discrete wavelength component laser is identical
The cavity circulation time.
In embodiments of the present invention, laser further include: the first optoisolator 7 and the second optoisolator 9；
First optoisolator 7 is connect with optical gain module 8 and output module respectively, the second optoisolator 9 respectively with light
It learns gain module 8 and dispersion management time delay module 6 connects；First optoisolator 7 and the second optoisolator 9 are used to keep laser
The one-way transmission of device inner laser, while reducing the influence of disturbance factor.
In embodiments of the present invention, output module includes: photo-coupler 10；
The first port 10a of photo-coupler 10 is connect with the third port of optical circulator 1, the third port of photo-coupler 10
10c is connect with the second optoisolator 9, and the second port 10b of photo-coupler 10 is 10% light splitting ratio port, for coupling output
Mode-locked laser pulse connects external test facility, the first port 10a of photo-coupler 10 and the third port of photo-coupler 10
It is 90% that 10c, which is divided ratio,.
Laser application of the present invention is illustrated below in conjunction with specific example.
The implementation device and equipment needed in implementation process has: an operating wavelength range 1530nm~1565nm, small letter
Number gain is greater than 30dB, and dispersion is less than 0.06ps/nm, erbium-doped fiber amplifier of the noise coefficient less than 5dB, a Polarization Control
Device, 3 ports light rings, a central wavelength 1550nm, modulation depth 2%, the semiconductor saturable of relaxation time 2ps
Absorb reflecting mirror, the 2*1 photo-coupler of splitting ratio 10:90, two optoisolators, several second order dispersion coefficients be-
The dispersive medium of 150ps/ (nmkm), single mode optical fiber, the maximal regulated model that several abbe numbers are 17ps/ (nmkm)
Enclose 600ps, the adjustable optic fibre delay line of precision 10fs, a high-speed piezoelectric ceramics tunable filter and a high-precision spectrum
Analyzer, a high-speed oscilloscope, Tianwan businessman autocorrelation function analyzer, a spectrum analyzer, a high-speed photodetector, one
Computer, a signal generator.
Wherein, erbium-doped fiber amplifier provides optical gain amplification for laser, when work, it is big that driving current is adjusted
The small erbium-doped fiber amplifier that changes realizes the regulation of laser performance parameter to the amplification effect of input light.
Polarization Controller has adjustable angle module, and inside modules are wrapped 1550nm standard single-mode fiber, adjustment module
The angle of swing can control polarization state inside laser, it can be achieved that the mode locking of laser pulse, adjusting.
Optical circulator is unidirectional loop working method, for connecting main chamber and semiconductor saturable absorption reflecting mirror, is worked
When, it is anti-that the light pulse of optical circulator first port 1a input can be fed to second port 1b output arrival semiconductor saturable absorption
Mirror is penetrated, third port output is fed to from second port 1b input after reflection and returns to main chamber.
Photo-coupler has 3 ports, and light splitting ratio is respectively 9:1, and 10% light splitting ratio port is swashed for exporting mode locking
Light, remaining port connecting laser other component.
Optoisolator is connected to erbium-doped fiber amplifier two sides, reduces the influence of the disturbance factors such as noise, keeps laser
The one-way transmission of inner laser.
Dispersive medium and adjustable optic fibre delay line are the introducing dispersion management of laser, control the group velocity of different wave length light wave
Dispersion profile is spent, the cavity circulation time is matched, and increases the detour time of endovenous laser, reduces laser resonator frequency.
As shown in Fig. 2, module occurs for spectrum analyzer, computer and signal generator composition driving signal for assigning wave
Long scan instruction, wherein spectrum analyzer acquisition process laser operating frequency, and enter data into computer and be compiled into control
Code processed, control code are conveyed to signal generator and generate corresponding driving signal, and signal frequency matches laser operating frequency, waveform
For period staircase waveform.
When the laser works, high-speed piezoelectric ceramics tunable filter receives length scanning driving signal, carries out discrete sweep
It retouches, adjusts vibrant characteristic so that optical path length follows working frequency mechanical periodicity and obtain discrete Fourier mode locking pulse,
This length scanning principle is as shown in Figure 3.
Wherein, Fig. 3 longitudinal axis is a kind of wide range laser feature spectrum, and the staircase waveform above horizontal axis is discrete wavelength scanning letter
Number, lower section is the laser pulse sequence generated in time domain.When piezoelectric ceramics (length scanning module) is scanned according to this staircase waveform
When, in the t of half of scan period1~t5In time, wavelength is successively from λ1~λ5Change (this process is discontinuous), i.e. t1When
It carves and exports λ in time domain1The laser pulse of wavelength.Therefore in a complete sweep cycle, each run-down, time domain are defeated back and forth for wavelength
Efficiency is double out.If improving stairstep signal frequency, the tuning speed of output wavelength can be further improved.
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 compose limited Fourier mode locked fiber laser characterized by comprising optical circulator (1), Polarization Controller
(2), saturable absorber (3), length scanning drive module, dispersion management time delay module (6), optical gain module (8) and defeated
Module out；
The first port of the optical circulator (1) is connected with the first end of the Polarization Controller (2), the optical circulator (1)
Second port be connected with the saturable absorber (3), the third port of the optical circulator (1) and the output module
First end is connected；The second end of the Polarization Controller (2) is connected with the first end of the length scanning drive module；The wave
The second end of long scan drive module is connect with the first end of the dispersion management time delay module (6), the dispersion management delay
The second end of module (6) is connect with the first end of the optical gain module (8), the second end of the optical gain module (8)
It is connect with the second end of the output module；
The optical gain module (8) provides optics for injecting pump energy for laser for the normal operation of laser
Gain amplification mechanism；
The optical circulator (1) described can be satisfied for the input light of the first port to be transmitted to by the second port
After absorber (3), the output light of the saturable absorber (3) is fed to the third port from the second port；
The saturable absorber (3), for realizing the self-starting modelocking of laser, while can compress line width, from
And obtain ultrashort laser pulse；
The Polarization Controller (2), for changing the local polarization state of laser inside optical path, to realize the lock of laser pulse
Mould operating and the adjusting and switching of mode-lock status；
The dispersion management time delay module (6) increases the detour time of laser, reduces laser for providing dispersion management mechanism
Device resonance frequency；
The length scanning drive module is used for generation wavelength scanning drive signal, and utilizes the length scanning driving signal
Scanning is filtered to laser pulse wavelength, finally from the ultrashort Fourier mode locking arteries and veins of output module output high speed frequency sweep
Punching, wherein the frequency of the length scanning driving signal and the work base chamber resonance frequency of laser match.
2. laser according to claim 1, which is characterized in that the length scanning drive module includes: length scanning
Module (5) occur for module (4) and length scanning driving signal；
Module (5) occur for the length scanning driving signal, for generating work base chamber resonance frequency phase of the frequency with laser
Matched length scanning driving signal, and drive the length scanning module (4) to sharp based on the length scanning driving signal
Light pulse wavelength is filtered scanning, so that the Resonant Intake System of laser follows work repetition rate mechanical periodicity.
3. laser according to claim 2, which is characterized in that module (5) packet occurs for the length scanning driving signal
It includes: waveform generating module (11), coding control module (12) and Spectral acquisition analysis module (13)；
The Spectral acquisition analysis module (13) will analyze number for acquiring and analyzing the work base chamber repetition rate of laser
According to being transferred to the coding control module (12)；
The coding control module (12), the work base of the laser for being uploaded according to the Spectral acquisition analysis module (13)
Chamber frequency data are encoded, and the control code that compiling is completed is transmitted to the waveform generating module (11)；
The waveform generating module (11), the control code for being conveyed according to the coding control module (12) generate corresponding frequencies
With the length scanning driving signal of waveform, negative feedback mechanism is introduced for laser stabilization operation.
4. laser according to claim 2, which is characterized in that the working method of the length scanning module (4) is electricity
Pressure driving, is made of sensitive piezoelectric ceramics, and scanning mode is discrete scanning, and when work, piezoelectric ceramics is according to the length scanning
The voltage signal that driving signal demodulates adjusts self vibration characteristic, so that the Resonant Intake System of laser follows work to repeat frequency
The variation of rate cyclic dispersion, and then discrete scanning is carried out to optical maser wavelength, final output is periodically composed limited discrete wavelength and is swashed
Light pulse.
5. laser according to claim 1, which is characterized in that the working method of the saturable absorber (3) is quilt
To move reflective, structure is that growth has the semiconductive thin film of saturable absorption property on semiconductor mirror, when work,
Under strong light, the saturable absorber (3) excites bleaching effect, and most of light energy lossless can reach institute through semiconductive thin film
Semiconductor mirror surface is stated, is reflected back in laser again later；Under dim light, the saturable absorber (3) is embodied
Unsaturated absorption characteristic, dim light is absorbed loss, so that pulsewidth becomes narrow gradually.
6. laser according to claim 2 or 4, which is characterized in that the dispersion management time delay module (6) passes through color
Dispersion media adjusts the time delay introduced to incident light pulse, so that laser pulse circulation time extension in laser, reduces work weight
Complex frequency matches the scan frequency of the length scanning module (4), while carrying out dispersion pipe to each discrete wavelength component laser
Reason, so that each discrete wavelength component laser obtains the identical cavity circulation time.
7. laser according to claim 1, which is characterized in that the laser further include: the first optoisolator (7) with
Second optoisolator (9)；
First optoisolator (7) connect with the optical gain module (8) and the output module respectively, second light
Isolator (9) is connect with the optical gain module (8) and the dispersion management time delay module (6) respectively；
First optoisolator (7) and second optoisolator (9) are used to keep the unidirectional biography of laser inner laser
It is defeated, while reducing the influence of disturbance factor.
8. laser according to claim 7, which is characterized in that the output module includes: photo-coupler (10)；
The first port of the photo-coupler (10) is connect with the third port of the optical circulator (1), the photo-coupler
(10) third port is connect with second optoisolator (9), and the second port of the photo-coupler (10) is 10% light splitting
Ratio port connects external test facility, the first port of the photo-coupler (10) for coupling output mode-locked laser pulse
Third port light splitting ratio with the photo-coupler (10) is 90%.
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