CN106025779A - Astronomical optical frequency comb system based on harmonic mode-locked fiber laser device - Google Patents
Astronomical optical frequency comb system based on harmonic mode-locked fiber laser device Download PDFInfo
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- CN106025779A CN106025779A CN201610580469.6A CN201610580469A CN106025779A CN 106025779 A CN106025779 A CN 106025779A CN 201610580469 A CN201610580469 A CN 201610580469A CN 106025779 A CN106025779 A CN 106025779A
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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
- H01S3/1109—Active mode locking
-
- 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- 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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
Abstract
The invention discloses an astronomical optical frequency comb system based on a harmonic mode-locked fiber laser device. The astronomical optical frequency comb system comprises a fiber laser device module, a pulse repetition frequency locking module, a frequency and power regulation module, a carrier envelope zero frequency locking module and a spectral broadening module, wherein the fiber laser device module outputs high repetition-rate mode-locked pulse laser; the pulse repetition frequency locking module and the fiber laser device module form a loop, and the pulse repetition frequency locking module is used for locking the pulse laser; an input end of the frequency and power regulation module is connected with an output of the fiber laser device module, and the frequency and power regulation module is used for increasing seed light repetition frequency and amplifying power; the carrier envelope zero frequency locking module, the fiber laser device module and the frequency and power regulation module form a loop, and the carrier envelope zero frequency locking module is used for locking carrier envelope zero frequency of the pulse laser; and the spectral broadening module is connected with an output of the frequency and power regulation module, and is used for broadening spectra of output pulses and outputting an optical frequency comb which can be used for calibrating an astronomical spectrometer.
Description
Technical field
The invention belongs to ultrafast optical techniques field, be specifically related to a kind of astronomy optics based on Harmonic mode-locked fiber laser
Frequency comb system.
Background technology
The development of laser technology has gone through over half a century, from solid state laser to optical fiber laser, each time technology send out
Exhibition is all that the progress of science provides power.In recent years, along with the appearance of femto-second laser pulse technology, the development of laser technology is entered
Enter the appearance of brand-new chapter, especially femtosecond laser frequency comb, breach existing measurement scale, to field of precision measurement
Contribution be the hugest.
So-called femtosecond laser frequency comb, refers to that the repetition rate by locking femtosecond Mode-locked laser and carrier envelope phase are inclined
Put frequency, obtain the femtosecond pulse that repetition rate in time domain is stable, meanwhile, this laser pulse on frequency domain with regard to table
Levy as the stable frequency spectrum of a series of frequency intervals, be similar to a ruler measured, the accurate measurement to frequency can be directly used as,
The most also optical frequency com it is referred to as.Optical frequency com, as a kind of novel measurement technique being different from traditional measurement method,
Achieve being directly connected to of optical frequency and microwave frequency, measure in precision spectroscopy research, physics constant, optical frequency
The front line science fields such as metering, optics atomic clock are significant.
The ultimate principle that optical frequency com produces is mode-locked laser pulse technology, and locked mode is generally divided into active mode locking and passive mode-locking.
In optical fiber laser, common passive mode-locking has polarization to rotate locked mode, saturable absorption locked mode, and active mode locking is usually in chamber
Interior addition acousto-optic or electrooptic modulator, realize the output of Mode-locked laser by amplitude or phase-modulation.With active mode locking technique
Comparing, passive mode-locking mode is affected with intracavity fiber lengths by device space distance, the lifting of repetition rate thus receive
Certain restriction.And harmonic mode locking technology involved in the present invention, breach such a to a certain extent and limit.
In recent years, along with the further development of optical frequency com technology, its huge applications in astronomy field be worth the most gradually by
People are found, optical frequency com is inputted in high-resolution celestial spectrum instrument and makees optical calibration, by this height by astronomer
Density, the wavelength scaling of high stable, can be greatly improved the certainty of measurement of celestial spectrum instrument, and this anticipates for astronomy is measured
Justice is huge, but, high-resolution astronomy spectrogrph has the highest requirement to the repetition rate of required optical frequency com,
Conventional optical frequency com can not reach such requirement, therefore to it must be repeated frequency by coupling high-resolution celestial spectrum instrument
Rate improves.
At present, can apply to the optical frequency com of celestial spectrum instrument, be mostly that traditional method based on solid state laser realizes optics frequency
Rate is combed.By Fabry Perot chamber filtering technique, the chamber in regulation Fabry Perot chamber is long, enters the optical frequency of seed light
Row filters, and improves longitudinal mode spacing, obtains the optical frequency com of more high repetition frequency, thus meets wanting of astronomy optical frequency com
Ask.But, optical frequency com system based on femto-second solid laser device under traditional method, by numerous machineries and optical element group
Becoming, and light beam is at free space transmission, system is numerous and diverse huge, runs operation complexity, and system maintenance is difficult to, and easily by environment shadow
Ring.
Summary of the invention
In place of the present invention is directed to above-mentioned the deficiencies in the prior art, break through the traditional method realizing astronomy optical frequency com, it is provided that
A kind of astronomy optical frequency com system based on Harmonic mode-locked fiber laser.This technology no longer places one's entire reliance upon Fabry amber
Sieve chamber filtering technique, but utilize the harmonic mode locking of optical fiber laser, directly improve the repetition rate of seed light, simultaneously by lock
Phase loop technique and carrier envelope zero-frequency locking system, repetition rate and carrier envelope zero-frequency to Harmonic mode-locked fiber laser are carried out
Accurate lock, amplifies and spectrum widening device broadening finally by fiber amplifier, and the power and the spectrum that improve optical frequency com cover
Lid scope so that it is the demarcation to part astronomy spectrogrph can be directly applied to.
The present invention proposes a kind of astronomy optical frequency com system based on Harmonic mode-locked fiber laser, described astronomy optics
Frequency comb system includes: optical fiber laser module, and it exports high repetition rate mode-locked lasers pulse laser；Pulse recurrence frequency locking mould
Block, described pulse laser is locked by it with described optical fiber laser module formation loop, described pulse recurrence frequency locking module
Fixed；Frequency and power conditioning module, its input is connected with the output of described optical fiber laser module, and described frequency is adjusted with power
Joint module improves seed light repetition rate amplifying power；Carrier envelope zero-frequency locking module, its with described optical fiber laser module,
Described frequency forms loop with power conditioning module, and described carrier envelope zero locks module for the carrier wave bag to described pulse laser
Network zero-frequency locks；With spectrum widening module, it is connected with the outfan of power conditioning module with described frequency, described spectrum
Broadening module carries out broadening to the spectrum of output pulse, and output can be used for demarcating the optical frequency com of astronomy spectrogrph.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described optical-fiber laser
Device module is to be provided with the half space half optical fiber structure optical fiber laser of gain fibre, piezoelectric ceramics and dispersion adjustment device.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described optical-fiber laser
Device module is to be provided with all optical fibre structure optical fiber laser of gain fibre, piezoelectric ceramics and dispersion adjustment device.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described dispersion adjustment
Device is grating, prism or optical fiber, and described dispersion adjustment device is used for regulating intra-cavity dispersion, makes described pulse laser reach to be formed
The negative dispersion state of harmonic mode locking.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described gain fibre
Including Er-doped fiber, Yb dosed optical fiber.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described frequency and merit
Rate adjustment module is fiber amplifier, or is made up of with the cascade of at least one-level F P chamber fiber amplifier.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described fiber amplifier
Device is chirped pulse fiber amplifier or self similarity fiber amplifier.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described spectrum widening
Module is by lens, cascades composition with photonic crystal fiber or one of nonlinear crystal or nonlinear waveguide.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described pulse repeats
Frequency lock module is made up of derived reference signal, detector, frequency mixer, filter amplification circuit, in order to controlling piezoelectric ceramics thus
Control chamber further long, make the pulse recurrence frequency accurate lock of acquisition.
In described based on Harmonic mode-locked fiber laser the astronomy optical frequency com system that the present invention proposes, described carrier envelope
Zero-frequency locking module is f-2f frequency lock system or 2f-3f frequency lock system.
The beneficial effects of the present invention is:
The present invention directly produces the Mode-locked laser of high repetition frequency based on harmonic mode locking, by the amplification of power, spectrum
Broadening and the accurate lock to frequency, directly output may be used for demarcating the optical frequency com of part high accuracy astronomy spectrogrph.
Based on present system, add F-P cavity filtering, improve the repetition rate of optical frequency com further it can also be used to demarcate
Other requires higher astronomy spectrogrph to repetition rate.
The present invention combines high power pump, by controlling intra-cavity dispersion actuator, makes resonator cavity reach to be capable of steady harmonic lock
The negative dispersion state of mould, thus export the harmonic mode locking pulse of high repetition frequency.
The present invention uses optical fiber based on harmonic mode locking to swash the device oscillator stage as generation high repetition frequency, and system structure is simple, accounts for
Little with space, input cost is few, and maintains easily system.
The present invention uses optical fiber laser based on harmonic mode locking as the oscillator stage of generation high repetition frequency, breaches conventionally employed
Multistage F-P cavity improves the method for pulse laser repetition rate, makes that astronomy optical frequency com system is more integrated, portability,
And system stability is more preferable compared to astronomy optical frequency com system based on fixed laser.
The present invention uses fiber amplifier based on chirped pulse amplification or fiber amplifier based on self similarity amplifying technique,
The pulse width of laser can be adjusted in amplification process, coordinate spectrum widening device that spectrum is carried out broadening simultaneously, thus obtain matter
Measure more preferable astronomy optical frequency com.
The present invention is based on optical fiber structure, and system structure is compact, and optical frequency com repetition rate is high, and harmonic mode locking can accurately control,
Overtone order is adjustable.
Accompanying drawing explanation
Fig. 1 is the structural representation of present invention astronomy based on Harmonic mode-locked fiber laser optical frequency com system.
Fig. 2 is the structure chart of the astronomy optical frequency com system using half space half optical fiber structure in embodiment 1.
Fig. 3 is the structure chart of the astronomy optical frequency com system using all optical fibre structure in embodiment 2.
Fig. 4 is the structure chart of the astronomy optical frequency com system using all optical fibre structure in embodiment 3.
Detailed description of the invention
In conjunction with specific examples below and accompanying drawing, the present invention is described in further detail.Implement the process of the present invention, bar
Part, experimental technique etc., outside the lower content mentioned specially, be universal knowledege and the common knowledge of this area, the present invention
Content is not particularly limited.
The structural representation of astronomy optical frequency com system of the present invention it is shown that refering to Fig. 1, Fig. 1.The present invention is swashed by optical fiber
Light device module 100, frequency and power conditioning module 200, pulse recurrence frequency locking module 300, carrier envelope zero-frequency locking mould
Block 400 and spectrum widening module 500 form.The outfan output high repetition rate mode-locked lasers pulse of optical fiber laser module 100 swashs
Light, the output of optical fiber laser module 100 is connected with the input of pulse recurrence frequency locking module 300, the feedback signal of generation
From the input of output to optical fiber laser module 100, thus form loop.The output of optical fiber laser module 100 again with frequency
Input with power conditioning module 200 is connected, a part for frequency and power conditioning module 200 output as feedback link to load
The input of wave envelope zero-frequency locking module 400, carrier envelope zero-frequency locking module 400 produces control signal and is connected to optical-fiber laser
Device module 100 is formed loop.Frequency exports with another part of power conditioning module 200 and is connected spectrum widening module 500,
Spectrum widening module 500 carries out broadening, from there through harmonic mode locking to the spectrum of output pulse, it is provided that repetition rate can be direct
Demarcate the laser pulse of part high accuracy celestial spectrum instrument.
In realizing presently preferred embodiments of the present invention, pulse recurrence frequency locking module 300 include laser pulse detector 301,
Frequency mixer 302, filter amplification circuit 303 and signal generator 304.The input of laser pulse detector 301 receives from light
Fibre laser module 100 output high repetition rate mode-locked lasers laser pulse, through laser pulse detector 301 detect after signal with
The standard signal that signal generator 304 produces enters frequency mixer 302 together and forms low frequency head error signal, low frequency head error signal via
Filter amplification circuit 303 produces feedback control signal, the feedback control signal of generation is fed back to optical fiber laser module 100,
Such that it is able to the chamber accurately controlling optical fiber laser is long, the laser pulse repetition frequency of output is made to be able to accurate lock.
In realizing presently preferred embodiments of the present invention, the input of carrier envelope zero-frequency locking module 400 receives by frequency and power
Adjustment module 200 improves the pulse laser after repetition rate and amplification, produces feedback signal and controls optical fiber laser module 100
Pumping current, further by the carrier envelope zero-frequency accurate lock of pulse, then through spectrum widening module 500 stretched-out spectrum,
The optical frequency com that may be used for demarcation astronomy spectrogrph of output higher-wattage eventually.
Embodiment 1
Refering to Fig. 1,2, Fig. 1 and Fig. 2 is shown that the structure chart of astronomy optical frequency com system in the present embodiment.This enforcement
In example, optical fiber laser module 100 is half space half optical fiber structure, and the laser pulse wavelength of generation is 1030nm.Pumping source 108
In annular chamber inject 980nm pumping, intracavity high concentration Yb dosed optical fiber 107 produce laser pass sequentially through optical fiber collimator 101,
/ 2nd wave plates 102, quarter-wave plate 103, beam splitter 104, through the laser straight of a kind of polarization state of beam splitter 104
Connecing output, the laser of another kind of polarization state continues to pass sequentially through quarter-wave plate 103 after beam splitter 104 reflects, dispersion is adjusted
Joint device 109, and reflect through the piezoelectric ceramics 105 with high reflective mirror, again return to quarter-wave plate 103, now laser arteries and veins
The polarization state of punching changes, then changes by the direction of propagation after beam splitter 104, the optics being then correlated with by polarization every
From device 106, quarter-wave plate 103, finally it is coupled in optical fiber again by optical fiber collimator 101, completes the most complete
Annular distance, such resonator cavity constitutes the condition producing harmonic mode locking pulse laser.In order to obtain the locked mode of high repetition frequency
Pulse laser, uses high concentration Yb dosed optical fiber and the optical element of Integration Design, further for obtaining more high repetition frequency
Harmonic mode locking pulse laser, can control dispersion adjustment device 109 and make intra-cavity dispersion maintain obvious negative dispersion state, increase simultaneously
Add the power of pumping 108 and adjust 1/2nd wave plates 102 and quarter-wave plate 103, reaching harmonic mode locking state, and logical
Cross differently configured negative dispersion and pump power, the overtone order of harmonic mode locking can be controlled.
In the present embodiment, the light path controlling resonator cavity is 0.6m, and under low-power pumping, can obtain repetition rate is 500MHz
Mode-locked laser, regulation dispersion adjustment device 109 grating introduce suitable negative dispersion, the power of pumping 108 brings up to 1.5W,
After adjusting two/wave plate 102 and quarter-wave plate 103, obtain, at outfan, the four-time harmonic lock that repetition rate is 2GHz
Mould laser pulse.Laser in the four-time harmonic mode-locked laser pulse signal input pulse repetition rate locking module 300 that will obtain
Pulse detector 301 detection obtains pulse signal, and enters frequency mixer 302 together with the standard signal produced with signal generator 304,
Producing low frequency head error signal, produce feedback control signal after low frequency head error signal amplifying circuit 303 after filtering, this signal is to light
Piezoelectric ceramics 105 in fibre laser module 100 is controlled, thus the chamber adjusting resonator cavity is long, it is achieved pulse is repeated frequency
The accurate lock of rate, can lock onto 10mHz by the repetition rate of pulse laser in the present embodiment.
After repetition rate locks, pulse laser is input in frequency and power conditioning module 200, the frequency in the present embodiment
Rate and power conditioning module are chirped pulse CPA fiber amplifier, introduce a part of pulse signal incoming carrier envelope zero after amplification
Frequency locking module 400, in the present embodiment, carrier envelope zero-frequency locking module 400 is f-2f system, is adjusting with power through overfrequency
After joint module 200, by photonic crystal fiber 401 by pulsed light broadening a to octave, then will by dichroic mirror 406
Pulsed light is divided into two-way, and wherein the pulsed light that wavelength is 1220nm is introduced frequency-doubling crystal 403 by a road, then injects reflecting mirror 402
Adjust optical path direction；Another road is to filter and the pulsed light that wavelength is 610nm that transmits, and injects delayer 404 and regulate
Light path, two-way pulsed light is injected acquisition of signal and is carried out beat frequency, acquisition of signal and processor 405 to beat frequency letter in processor 405
Number detect and process, thus produce feedback control signal and pumping current is controlled, it is achieved pulse signals carrier envelope
The accurate lock of zero-frequency, finally inputs a signal into spectrum widening module 500, and stretched-out spectrum can cover 400nm 1000nm.
The high power optical frequency comb of final output, its repetition rate is 2GHz, and repetition rate locking precision reaches mHz, and carrier wave
Envelope zero-frequency locks the most simultaneously, and spectrum covers 400nm 1000nm, can be directly used for demarcating part high accuracy astronomy spectrogrph.
Embodiment 2
Refering to Fig. 1,3, Fig. 1 and Fig. 3 is shown that the structure chart of the present embodiment astronomy optical frequency com system, the present embodiment
The laser pulse wavelength of middle generation is 1030nm, and optical fiber laser module 100 is all optical fibre structure.Pumping source 111 is to annular chamber
Middle injection 980nm pumping, interacvity gain optical fiber 116 produces the laser of stimulated radiation and passes sequentially through wavelength division multiplexer 112, polarization
Relevant optical isolator 113, fiber coupler 114, optical fiber 116 (being Yb dosed optical fiber in the present embodiment), Polarization Controller
117, dispersion adjustment device 118 completes the most complete annular distance, utilizes piezoelectric ceramics 115 to finely tune fiber lengths, so simultaneously
Resonator cavity constitute produce harmonic mode locking pulse laser condition, in order to obtain the Mode-locked laser of high repetition frequency, use
High concentration Yb dosed optical fiber and the optical element of Integration Design, by regulation Polarization Controller 117, can form harmonic mode locking arteries and veins
Impulse light, and by differently configured negative dispersion and pump power, the overtone order of harmonic mode locking can be controlled.In the present embodiment,
The light path controlling resonator cavity is 1.2m, under low-power pumping, can obtain the Mode-locked laser that repetition rate is 250MHz,
The power of pumping 111 is brought up to 1.5W, controls dispersion adjustment device 118 and make resonator cavity obtain suitable negative dispersion, adjust polarization
After controller 117, obtain, at outfan, the four-time harmonic mode-locked laser pulse that repetition rate is 1GHz.By humorous for obtain four times
Ripple mode-locked laser pulse signal input pulse repetition rate locking module 300, the pulse signal that detector 301 obtains is sent out with signal
The standard signal that raw device 304 produces enters frequency mixer 302 together, then produces feedback control signal by filter amplification circuit 303,
Piezoelectric ceramics 115 in optical fiber laser module is controlled by this signal, and piezoelectric ceramics controls the length change of optical fiber, thus
The chamber adjusting resonator cavity is long, it is achieved the accurate lock to pulse recurrence frequency, can be by the repetition frequency of pulse laser in the present embodiment
Rate locks onto 10mHz.
After repetition rate locks, pulse laser is input in frequency and power conditioning module 200, the frequency in the present embodiment
Rate and power conditioning module are two-stage F-P cavity 201 and chirped pulse fiber amplifier 202, utilize F-P cavity filtering technique, pass through
The repetition rate of pulse laser is brought up to 40GHz by two-stage F P chamber 201, then amplifies through chirped pulse fiber amplifier 202,
Then a part of pulse signal incoming carrier envelope zero-frequency locking module 400 is introduced, carrier envelope zero-frequency locking mould in the present embodiment
Block 400 is f-2f system, after overfrequency and power conditioning module 200, by photonic crystal fiber 401 by pulsed light exhibition
Wide to one octave, is then divided into two-way by dichroic mirror 406 by pulsed light, and wherein wavelength is the pulse of 1220nm by a road
Light introduces frequency-doubling crystal 403, then injects reflecting mirror 402 and adjusts optical path direction；Another road is the wavelength filtering and transmitting
For the pulsed light of 610nm, and inject delayer 404 and regulate light path, two-way pulsed light inject acquisition of signal with in processor 405
Carrying out beat frequency, beat signal is detected and processes by acquisition of signal and processor 405, thus produces feedback control signal to pump
Pu electric current is controlled, it is achieved the accurate lock of pulse signals carrier envelope zero-frequency, finally inputs a signal into spectrum widening module
500, stretched-out spectrum can cover 400nm 1000nm.
The high power optical frequency comb of final output, its repetition rate is 40GHz, and repetition rate locking precision reaches mHz, and carrier wave
Envelope zero-frequency locks the most simultaneously, and spectrum covers 400nm 1000nm, can be used for demarcating high accuracy astronomy spectrogrph.
Embodiment 3
Refering to Fig. 1,4, Fig. 1 and Fig. 4 is shown that the structure chart of the present embodiment astronomy optical frequency com system, the present embodiment
The laser pulse wavelength of middle generation is 1550nm, and optical fiber laser module 100 is all optical fibre structure.Pumping source 121 is to annular chamber
Middle injection 980nm pumping, interacvity gain optical fiber 126 produces the laser of stimulated radiation and passes sequentially through wavelength division multiplexer 122, polarization
Relevant optical isolator 123, fiber coupler 124, optical fiber 126 (being Er-doped fiber in the present embodiment), Polarization Controller
127, dispersion adjustment device 128 completes the most complete annular distance, utilizes piezoelectric ceramics 125 to finely tune fiber lengths, so simultaneously
Resonator cavity constitute produce harmonic mode locking pulse laser condition, in order to obtain the Mode-locked laser of high repetition frequency, use
High concentration erbium-doped fiber and the optical element of Integration Design, by regulation Polarization Controller 127, can form harmonic mode locking arteries and veins
Impulse light, and by differently configured negative dispersion and pump power, the overtone order of harmonic mode locking can be controlled.In the present embodiment,
The light path controlling resonator cavity is 1.2m, under low-power pumping, can obtain the Mode-locked laser that repetition rate is 250MHz,
The power of pumping 121 is brought up to 2W, controls dispersion adjustment device 128 and make resonator cavity obtain suitable negative dispersion, adjust polarization control
After device 127 processed, obtain, at outfan, the four-time harmonic mode-locked laser pulse that repetition rate is 1GHz.The four-time harmonic that will obtain
Mode-locked laser pulse signal input pulse repetition rate locking module 300, the pulse signal that detector 301 obtains occurs with signal
The standard signal that device 304 produces enters frequency mixer 302 together, then produces feedback control signal by filter amplification circuit 303,
Piezoelectric ceramics 125 in optical fiber laser module is controlled by this signal, and piezoelectric ceramics controls the length change of optical fiber, thus
The chamber adjusting resonator cavity is long, it is achieved the accurate lock to pulse recurrence frequency, can be by the repetition frequency of pulse laser in the present embodiment
Rate locks onto 10mHz.
After repetition rate locks, pulse laser is input in frequency and power conditioning module 200, the frequency in the present embodiment
Rate and power conditioning module are two-stage F-P cavity 201 and chirped pulse fiber amplifier 202, utilize F-P cavity filtering technique, pass through
The repetition rate of pulse laser is brought up to 40GHz by two-stage F P chamber 201, then amplifies through chirped pulse fiber amplifier 202,
Then a part of pulse signal incoming carrier envelope zero-frequency locking module 400 is introduced, carrier envelope zero-frequency locking mould in the present embodiment
Block 400 is 2f-3f system, after overfrequency and power conditioning module 200, by photonic crystal fiber 401 by pulsed light
Broadening covers 1200nm 1800nm, then by dichroic mirror 406, pulsed light is divided into two-way, and wherein wavelength is 1200nm by a road
Pulsed light introduce frequency-doubling crystal 403 carry out frequency multiplication, then inject reflecting mirror 402 and adjust optical path direction；Another road is to filter also
The wavelength transmitted is the pulsed light of 1800nm, and injects delayer 404 and carry out frequency tripling, and two-way pulsed light is injected signal and visited
Surveying and carry out beat frequency in processor 405, beat signal is detected and processes by acquisition of signal and processor 405, thus produces
Pumping current is controlled by feedback control signal, it is achieved the accurate lock of pulse signals carrier envelope zero-frequency, finally by signal
Input spectrum broadening module 500, stretched-out spectrum can cover 400nm 1000nm.
The high power optical frequency comb of final output, its repetition rate is 40GHz, and repetition rate locking precision reaches mHz, and carrier wave
Envelope zero-frequency locks the most simultaneously, and spectrum covers 400nm 1000nm, can be used for demarcating high accuracy astronomy spectrogrph.
The protection content of the present invention is not limited to above example.Under the spirit and scope without departing substantially from inventive concept, this area skill
Art personnel it is conceivable that change and advantage be all included in the present invention, and with appending claims as protection domain.
Claims (10)
1. an astronomy optical frequency com system based on Harmonic mode-locked fiber laser, it is characterised in that described astronomy light
Learn frequency comb system to include:
Optical fiber laser module, it exports high repetition rate mode-locked lasers pulse laser；
Pulse recurrence frequency locking module, it forms loop, described pulse recurrence frequency locking mould with described optical fiber laser module
Described pulse laser is locked by block；
Frequency and power conditioning module, its input is connected with the output of described optical fiber laser module, and described frequency is adjusted with power
Joint module improves seed light repetition rate amplifying power；
Carrier envelope zero-frequency locking module, itself and described optical fiber laser module, described frequency and power conditioning module formation loop,
Described carrier envelope zero locks module for locking the carrier envelope zero-frequency of described pulse laser；With
Spectrum widening module, it is connected with the outfan of power conditioning module with described frequency, and described spectrum widening module is to output
The spectrum of pulse carries out broadening, and output can be used for demarcating the optical frequency com of astronomy spectrogrph.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 1, its feature exists
In, described optical fiber laser module is to be provided with the half space half optical fiber structure optical fiber of gain fibre, piezoelectric ceramics and dispersion adjustment device
Laser instrument.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 1, its feature exists
In, described optical fiber laser module is to be provided with all optical fibre structure optical fiber laser of gain fibre, piezoelectric ceramics and dispersion adjustment device.
4., according to the astronomy optical frequency com system based on Harmonic mode-locked fiber laser described in Claims 2 or 3, it is special
Levying and be: described dispersion adjustment device is grating, prism or optical fiber, described dispersion adjustment device is used for regulating intra-cavity dispersion, makes described
Pulse laser reaches to be formed the negative dispersion state of harmonic mode locking.
5., according to the astronomy optical frequency com system based on Harmonic mode-locked fiber laser described in Claims 2 or 3, it is special
Levying and be, described gain fibre includes Er-doped fiber, Yb dosed optical fiber.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 1, its feature exists
In, described frequency and power conditioning module are fiber amplifier, or are made up of with the cascade of at least one-level F P chamber fiber amplifier.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 6, its feature exists
In, described fiber amplifier is chirped pulse fiber amplifier or self similarity fiber amplifier.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 1, its feature exists
In, described spectrum widening module is by lens, cascades composition with photonic crystal fiber or one of nonlinear crystal or nonlinear waveguide.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 1, its feature exists
In, described pulse recurrence frequency locking module is made up of derived reference signal, detector, frequency mixer, filter amplification circuit, in order to
Control piezoelectric ceramics control chamber length and make the pulse recurrence frequency accurate lock of acquisition.
Astronomy optical frequency com system based on Harmonic mode-locked fiber laser the most according to claim 1, its feature exists
In, described carrier envelope zero-frequency locking module is f-2f frequency lock system or 2f-3f frequency lock system.
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| CN201610580469.6A CN106025779A (en) | 2016-07-22 | 2016-07-22 | Astronomical optical frequency comb system based on harmonic mode-locked fiber laser device |
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