CN109378696A - High-average-power mode-locked laser generation system and method based on parallel frequency shift - Google Patents
High-average-power mode-locked laser generation system and method based on parallel frequency shift Download PDFInfo
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- CN109378696A CN109378696A CN201811322804.8A CN201811322804A CN109378696A CN 109378696 A CN109378696 A CN 109378696A CN 201811322804 A CN201811322804 A CN 201811322804A CN 109378696 A CN109378696 A CN 109378696A
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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
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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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
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Abstract
The invention provides a high average power mode-locked laser generating system and method based on parallel frequency shift, which comprises the following steps: a laser seed source for generating single-frequency/narrow-linewidth continuous laser; the laser beam splitting unit is used for carrying out multi-path beam splitting on the laser emitted by the laser seed source; carrying out parallel frequency shift on the split laser to obtain laser carrier frequency shift units with carrier frequencies distributed in an arithmetic progression; a high-power continuous light amplification unit for performing high-power continuous light amplification on the laser light of each carrier frequency; and a heterodyne beam combining unit for performing heterodyne beam combining on the amplified multiple paths of laser light.
Description
Technical field
The present invention relates to a kind of laser mode locking technology, especially a kind of high-average power mode-locked laser based on shift frequency in parallel
Generation system and method.
Background technique
Laser mode locking technology is the current technical way for generating ultrashort and ultrahigh laser, the ultra-short pulse width created
The temporal resolution of superelevation is made it have, thus is widely used in the detection of ultrafast phenomena, such as detects electron transition and relaxation
The ultrafast process such as Henan, atom nuclear motion, formation of chemical bond.Ultrahigh peak power brought by ultrashort pulse width, so that lock
Mould laser is used not only for the damage and processing of material, also be used to create extreme physical environment, e.g., laser particle accelerators,
Laser controlled nuclear fusion, excitation positron-electron equity.
Since the nonlinear effect that the peak power of mode-locked laser superelevation easily causes laser working medium is even damaged, so that
The promotion of mode-locked laser mean power faces biggish technical problem.Currently, generalling use chirp amplifying technique, pulsed reactor accumulates
Big technology, mode locking optics coherence tomography technology etc. promote the pulse energy or mean power of mode-locked laser.
Chirped pulse amplification technique is first to broaden mode-locked laser pulse to reduce in amplification process to reduce peak power
Nonlinear effect, then Pulse Compression is carried out to the amplified pulse of energy.Although lock can be substantially improved in chirped pulse amplification technique
The pulse energy of mould laser, but it is usually to sacrifice repetition as cost, so that the mean power promotion of mode-locked laser extremely has
Limit, the state-of-the-art mean power for clapping watt laser is logical as the BELLA in Lawrence Berkeley National laboratory at present
Often only tens watts.
Pulse pile-up amplifying technique be in time by pulse-spreading at a series of train of pulse peak work is effectively reduced
Train of pulse is piled into the pulse of high-energy by rate again after amplification.Pulse pile-up amplifying technique can be in broader time range
Interior Decentralized Impulse energy reduces nonlinear effect, can get higher pulse energy, but equally to the promotion of mean power very
It is limited.
Mode locking optics coherence tomography technology is to amplify multichannel mode-locked laser respectively, then passes through spectrum and phase controlling
Technology, the road Shi Ge coherent superposition are final to can get compared with high energy and higher mean power.The deficiency of the technology is to join
Laser with synthesis is still mode-locked laser, so the available mean power of single channel mode-locked laser is limited.Obtain Gao Ping
The number that the mode-locked laser of equal power then needs to synthesize is more, and system is very huge, and the optics coherence tomography technology of mode-locked laser compared with
For complexity, control precision is higher, and number excessively then realizes that difficulty is very huge, has experimentally just reached 8 optical fiber synthesis at present
For 1kW, 1mJ.
Summary of the invention
The present invention provides a kind of high-average power mode-locked laser generation system and method based on shift frequency in parallel, Ke Yi great
The mean power of width promotion mode-locked laser.
Realize the object of the invention technical solution are as follows: the high-average power mode-locked laser generation system based on shift frequency in parallel, packet
Include a single-frequency or narrow linewidth continuous laser seed source, a laser beam splitter unit, the carrier wave shift frequency unit of several parallel connections, several parallel connections
The continuous amplifying unit of high power and heterodyne light beam synthesis unit；The wherein single-frequency that laser beam splitter unit emits laser seed source
Or the multi-path laser that narrow linewidth continuous laser beam splitting success rate is equal；Carrier wave shift frequency unit moves the road beam splitting Hou Ge laser
Frequently, the multi-path laser that carrier frequency is in arithmetic progression distribution is obtained；Each continuous amplifying unit of high power is by a carrier frequency
Laser carries out power amplification；Heterodyne light beam synthesis unit carries out heterodyne to amplified each road laser and closes beam.
Using above system, the laser of laser seed source transmitting is single-frequency or narrow linewidth continuous laser.
Using above system, the carrier frequency separation of every Shu Jiguang is usually in ten KHz to ten GHz magnitudes.
Using above system, carrier wave shift frequency unit includes several acousto-optic frequency shifters, and the shift frequency amount of every road acousto-optic frequency shifters is in
Arithmetic progression distribution.
Using above system, the continuous amplifying unit of high power includes the narrow linewidth high power laser light being connected in each road laser
Amplifier, for promoting the mean power of each road laser.
Using above system, heterodyne light beam synthesis unit includes being connected on per before narrow linewidth high power laser light amplifier all the way
Optical delay line, phase-modulator, Polarization Controller and a high power-beam synthesizer of whole system rear end；Optical delay line
Control the equivalent optical path of the road the light path Shi Ge laser of corresponding road laser；The phase that phase-modulator locks each road laser is extremely set
Value；The polarization state that Polarization Controller controls the road the polarization state Shi Ge laser of corresponding road laser is consistent, high power-beam synthesis
Device is that each road-load wave frequency rate is carried out heterodyne in the high power continuous laser of arithmetic progression distribution to close beam.
The high-average power mode-locked laser production method of system as described above, comprising: continuous laser beam splitting power is equal
Multi-path laser；The road beam splitting Hou Ge laser is subjected to shift frequency respectively, carrier frequency is obtained and swashs in the multichannel of arithmetic progression distribution
Light；The laser of each road-load wave frequency rate is subjected to independent high power continuous laser amplification；Amplified multi-path laser is carried out
Heterodyne closes beam.
Compared with prior art, the present invention have the advantage that the technical scheme is that by each road single-frequency or
Narrow linewidth continuous laser carries out independent high power continuous laser amplification, and it is various to can effectively avoid mode-locked laser pulse amplification process
Nonlinear effect and laser medium damage the restriction to energy lift, and every road single-frequency continuous laser can be easier to realize KW magnitude
Amplification, heterodyne synthesis after can be achieved the above magnitude of myriawatt high-average power mode-locked laser pulse output.The complexity of system
Other technical solutions are much smaller than with realization difficulty.
The invention will be further described with reference to the accompanying drawings of the specification.
Detailed description of the invention
Fig. 1 is present system principle of compositionality figure.
Fig. 2 is the optic fibre light path schematic diagram of present system.
Fig. 3 is the space optical path schematic diagram of present system.
Fig. 4 is method flow schematic diagram of the invention.
Fig. 5 is that the laser longitudinal module of resonant cavity selects schematic diagram, wherein the longitudinal mode schematic diagram of (a) for resonant cavity, (b) is laser
Gain and loss spectra schematic diagram, (c) for round-trip one week in resonant cavity and gain is greater than the longitudinal mode schematic diagram being lost.
Fig. 6 be longitudinal mode random superposition schematic diagram, wherein (a) be 5 light longitudinal mode random phases superposition each longitudinal mode carrier wave and
Superimposed light intensity schematic diagram is (b) that each longitudinal mode carrier wave of 7 light longitudinal mode random phases superpositions and superimposed light intensity are illustrated
Figure is (c) each longitudinal mode carrier wave and superimposed light intensity schematic diagram of the superposition of 9 light longitudinal mode random phases.
Fig. 7 is the superposition schematic diagram that longitudinal mode is locked to zero phase, wherein (a) is that 5 light longitudinal modes are locked to each of zero phase
Longitudinal mode carrier wave and superimposed light intensity schematic diagram (b) are locked to each longitudinal mode carrier wave of zero phase and superimposed for 7 light longitudinal modes
Light intensity schematic diagram is locked to each longitudinal mode carrier wave and superimposed light intensity schematic diagram of zero phase (c) for 9 light longitudinal modes.
Specific embodiment
Continuous laser and laser mode locking technology of the present invention does description below.
1, continuous laser
The laser seed source used in the present invention is different from the shorter laser of pulse width in the prior art, but uses
The spectrum for exporting laser has the continuous laser of single-frequency or narrow linewidth characteristic.
The working principle of continuous wave laser is: under the action of external source, the light wave that gain media generates can be
Roundtrip between former and later two hysteroscopes of resonant cavity.When laser emits laser, laterally (perpendicular to the side of laser transmission
To) on, the only direction of propagation light wave that is parallel to resonance cavity direction can just pass repeatedly through gain media, persistently be amplified, other
The light in direction will gradually deflect away from hysteroscope after multiple reflections, finally be depleted, and cannot be stabilized.Therefore, resonant cavity rises
The effect for horizontally selecting the spatial model of light beam, i.e. transverse mode selection are arrived.Secondly, (being parallel to laser transmission in the longitudinal direction
Direction), the light wave for only meeting standing-wave condition can be just stabilized, and therefore, resonant cavity also plays modeling effect in the longitudinal direction,
That is longitudinal mode selection, as shown in Fig. 5 (a).
The longitudinal mode for finally capableing of starting of oscillation in resonant cavity is also related with the loss of bandwidth resonant cavity of gain media.Gain is situated between
There are certain gain bandwidths for matter, only the longitudinal mode within the scope of gain bandwidth, are possible to be amplified, in Fig. 5 (b)
Bold portion.The longitudinal mode that round-trip gain in one week is greater than loss only in resonant cavity can be just progressively amplified, and be ultimately formed sharp
Light, such as Fig. 5 (c).
The light field of any one longitudinal mode can be expressed as
Wherein, Em、fm、km、It is amplitude, the frequency, wave mistake, initial phase of m-th of longitudinal mode respectively, L is Resonant Intake System
Degree, c is the light velocity, km=2 π nmfm/ c, nmFor the refractive index of m-th of longitudinal mode.
The light field of laser output is the superposition of the longitudinal mode light field of all starting of oscillations, is expressed as
Wherein, fm=f0+ m Δ f, f0For centre carrier frequency, by kmExpression formula substitutes into formula (2) and obtains
The initial phase of each longitudinal mode light field of general laser is independent of one another, is in random distribution, each longitudinal mode light field cannot
Form effective coherent superposition, the laser energy of final output is in continuously distributed, therefore referred to as continuous laser in time.Such as figure
Shown in 6, phase random distribution will lead to that carrier wave direction of vibration is disorderly and unsystematic, can not form lasting coherent enhancement or weakening.Even
The light intensity of continuous laser locally can also have certain random fluctuation.This random fluctuation, can with the increase of longitudinal mode number and
It is gradually reduced.The light intensity of continuous light is the superposition of each longitudinal mode light intensity, if each longitudinal mode light intensity is equal, final continuous laser is averaged
Light intensity is NI0, wherein N is longitudinal mode number, I0For longitudinal mode light intensity.
2, laser mode locking
It, then can be with so that have determining phase relation between each longitudinal mode when taking laser special modulation means
Make to generate coherent superposition between each longitudinal mode, generate ultrashort laser pulse, this technology is known as laser mode locking technology.
Assuming that the initial phase of each longitudinal mode is all locked to zero phase, i.e.,Then formula (3) can be written as
Enable the amplitude of each longitudinal mode equal, i.e. Em=E0, can be obtained using Euler's formula exp (jx)=cos (x)+jsin (x)
Cos (x)=Re [exp (jx)], j are imaginary symbols, and Re is the operator for taking real part, then formula (4) can be written as
Utilize the sum formula of geometric progressionThe amplitude expression formula of light field can be acquired
Light intensity is laying flat for light wave electric field amplitude mode, for the specific position of laser resonant cavity, such as z=0, then
As shown in fig. 7, light intensity waveform is periodically pulsing sequence when multiple longitudinal modes are locked in zero phase.Pulse period
It is the inverse of longitudinal mode spacing, i.e. Tr=1/ Δ f=2L/c, that is, laser time needed for round trip in resonant cavity.Arteries and veins
Width is rushed to reduce, t available by formula (7) with the increase of longitudinal mode numberp=1/N Δ f=Tr/ N, i.e. pulse width
It is also the 1/N of laser pulse period for the inverse of laser longitudinal module total bandwidth.The peak light intensity of pulse is N2I0, more flat than continuous light
Equal light intensity is N times high.It can be seen that laser longitudinal module quantity is more, pulse width is shorter, and peak value is higher.
In conjunction with Fig. 1, the present invention, as seed laser, it is continuous to carry out laser beam splitter, carrier wave shift frequency, multichannel using continuous laser
The amplification of laser high power, heterodyne synthesis, obtain high-average power mode-locked laser pulse sequence.F in Fig. 10For seed source laser
Carrier frequency, Δ f are minimum shift frequency interval.A kind of high-average power mode-locked laser generation system based on shift frequency in parallel, including
One continuous laser seed source, a laser beam splitter unit, a carrier wave shift frequency unit, several parallel connections the continuous amplifying unit of high power and
Heterodyne light beam synthesis unit.Laser beam splitter unit swashs the equal multichannel of continuous laser beam splitting success rate that laser seed source emits
Light；Laser after beam splitting is carried out shift frequency by carrier wave shift frequency unit, obtains the laser that carrier frequency is in arithmetic progression distribution；It is each high
The laser of one carrier frequency is carried out independent high power continuous laser and amplified by the continuous amplifying unit of power；The synthesis of heterodyne light beam is single
Member carries out heterodyne to amplified each road laser and closes beam.
The laser seed source used in the present invention is different from the shorter laser of pulse width in the prior art, but uses
The spectrum for exporting laser has the continuous laser of single-frequency or narrow linewidth characteristic.Single-frequency or narrow linewidth continuous laser can provide more
Pure frequency content and longer laser coherence length, convenient for subsequent efficient heterodyne synthesis.
By single-frequency or the elder generation's beam splitting of narrow linewidth continuous seed laser and then carrier wave shift frequency, to obtain multichannel carrier frequency in equal difference
The continuous laser of ordered series of numbers distribution, it is similar to multiple longitudinal modes of traditional mode-locked laser, but have essential difference, the main distinction is not
The continuous laser of same frequency can be separated from each other, and carried out independent high power laser light amplification respectively for subsequent each road and provided possibility.
The heterodyne light beam synthesis used in the present invention has similarity with existing optics coherence tomography, Spectral beam combining, but exists
It is essential different.Firstly, the carrier frequency for participating in the road heterodyne He Shuge laser is different, and each road laser of common coherently combined
Carrier frequency is identical；Secondly, the carrier frequency separation for participating in every road laser of heterodyne synthesis is relatively small, it is much smaller than spectrum beam combination
Every road wavelength interval corresponding to frequency interval.The frequency interval of heterodyne synthesis is usually in ten KHz to ten GHz magnitudes, and light
The corresponding wavelength interval of synthetic technology is composed in sub- nm to nm magnitude, corresponding frequency interval is usually in sub- THz to THz magnitude.
In conjunction with Fig. 2, wherein ISO is optoisolator, and 1 × N is multichannel beam splitter, and FS is acousto-optic frequency shifters, and DL is light delay
Line, PM are phase-modulator, and PC is Polarization Controller, and Amp is image intensifer, and BC is bundling device, and BS is beam splitter, and PD is photoelectricity
Detector, CCD are CCD camera.Optoisolator is located at single-frequency laser (single frequency laser) emitted laser
Optical path on.Multichannel beam splitter is located in the optical path of optoisolator rear end.Carrier wave shift frequency unit is acousto-optic frequency shifters, N number of acousto-optic
Frequency shifter is located in each different light paths of multichannel beam splitter rear end, sets gradually light in the optical path of each acousto-optic frequency shifters rear end and prolongs
Slow line, phase-modulator, Polarization Controller and image intensifer, N number of image intensifer converge the laser after power amplification to bundling device
Middle progress heterodyne closes beam.Wherein, optical delay line controls the equivalent optical path of the road the light path Shi Ge laser of corresponding road laser；Phase-modulation
Device locks the phase of each road laser to setting value；Polarization Controller controls the polarization of the road the polarization state Shi Ge laser of corresponding road laser
State is consistent；Image intensifer amplifies corresponding road laser power.
In order to monitor and optimize laser mode locking effect, setting control unit collects bundling device and closes a part of light beam after beam,
Using photodetector measurement synthesis mode-locked laser pulse waveform, for feedback control fibre delay line, phase-modulator,
Polarization Controller etc., the effect for closing beam to difference interference optimize.The space coincidence of light beam can also be monitored with CCD camera
Degree.
In conjunction with Fig. 3, multichannel beam splitter is made of several beam splitters and reflective mirror, and wherein optoisolator rear end is arranged first point
Continuous laser is divided into two beams by Shu Jing, and the first beam is refracted in first via acousto-optic frequency shifters by the first reflecting mirror, and the second beam is logical
Subsequent beam splitter is crossed to be reflected into except finally entering after the refraction of the second reflective mirror all the way in last acousto-optic frequency shifters all the way
Finally in acousto-optic frequency shifters all the way.Beam splitter is set after bundling device, and sub-fraction laser beam splitter, which is used for optimizing detection, to be made
With, lens being set after beam splitter, laser is focused, the laser after focusing is transmitted to CCD camera by beam splitter, a part,
Another part is transmitted to photodetector.The waveform of the mode-locked laser pulse of photodetector measurement synthesis, is used for feedback control
Fibre delay line, phase-modulator, Polarization Controller etc., the effect for closing beam to difference interference optimize；CCD camera monitors light
The space coincidence degree of beam.
In conjunction with Fig. 4, a kind of high-average power mode-locked laser production method based on shift frequency in parallel, comprising the following steps:
Step 1, the single-frequency or narrow linewidth continuous laser single-frequency or narrow linewidth continuous wave laser exported, passes through multi-path laser
Seed laser is divided into the equal road N of power by beam splitter；
Step 2, it will be handled by step 1, the road the N power of acquisition equal single-frequency or narrow linewidth continuous laser are led to respectively
The acousto-optic frequency shifters on the road Guo Ge carry out carrier wave shift frequency；
Step 3, it is handled by step 2, the carrier frequency of acquisition connects in each road single-frequency or narrow linewidth of arithmetic progression distribution
Continuous laser successively passes through the optical delay line, phase-modulator, Polarization Controller on each road；
Step 4, the every road single-frequency or narrow linewidth continuous laser, the high power for passing through each road respectively handled by step 3 connects
Continuous laser amplifier, carries out power amplification, obtains high power single-frequency or narrow linewidth continuous laser；
Step 5, the carrier frequency obtained after step 4 processing is in each road high power single-frequency or narrow of arithmetic progression distribution
Line width continuous laser, by light beam beam merging apparatus, the road Shi Ge light beam is spatially highly overlapped, and carries out multiple beam difference interference,
Generate the mode-locked laser pulse sequence of high-average power.
Step 6, from the high-average power mode-locked laser obtained after step 5 processing, weaker beam of laser is separated
For monitoring the effect of heterodyne synthesis.
In step 2, the shift frequency amount of the acousto-optic frequency shifters on every road is distributed in arithmetic progression, and tolerance is Δ f, then is moved by acousto-optic
After frequency device, the carrier frequency of each road laser becomes f0+Δf,f0+2Δf,...,f0The arithmetic progression of+N Δ f.
Amplifier is placed on to the purpose after optical delay line, phase-modulator, Polarization Controller to be to prevent in step 4
Damage of the high power table laser of laser amplifier output to above-mentioned device.
The waveform that the mode-locked laser pulse of synthesis can be measured in step 6 with photodetector, prolongs for feedback control optical fiber
Slow line, phase-modulator, Polarization Controller etc., the effect for closing beam to heterodyne optimizes.Digital image sensor can also be used
Monitor the space coincidence degree of light beam.
Claims (10)
1. a kind of high-average power mode-locked laser generation system based on shift frequency in parallel, which is characterized in that including a continuous laser
Seed source, a laser beam splitter unit, the carrier wave shift frequency unit of several parallel connections, several parallel connections high power continuous laser amplifying unit
With heterodyne light beam synthesis unit；Wherein
Continuous laser seed source emits continuous laser；
The equal multi-path laser of the continuous laser beam splitting success rate that laser beam splitter unit emits laser seed source；
Beam splitting Hou Ge road laser is carried out shift frequency respectively by carrier wave shift frequency unit, obtains carrier frequency in the more of arithmetic progression distribution
Road laser；
The laser of one carrier frequency is carried out high power amplification by each high power continuous laser amplifying unit；
Heterodyne light beam synthesis unit carries out heterodyne to amplified multiplex high power continuous laser and closes beam.
2. system according to claim 1, which is characterized in that the continuous laser of laser seed source transmitting is single-frequency or narrow line
Wide continuous laser.
3. system according to claim 1, which is characterized in that the carrier frequency separation of every Shu Jiguang is usually ten
KHz is to ten GHz magnitudes.
4. system according to claim 1, which is characterized in that carrier wave shift frequency unit includes acousto-optic frequency shifters, every road acousto-optic
The shift frequency amount of frequency shifter is distributed in arithmetic progression.
5. system according to claim 1, which is characterized in that the continuous amplifying unit of high power includes be connected on each road narrow
Every road laser is carried out the amplification of narrow linewidth high power by line width high power laser light amplifier.
6. system according to claim 1, which is characterized in that heterodyne light beam synthesis unit includes the concatenated light delay in each road
Line, phase-modulator, Polarization Controller, and by each road heterodyne close beam high power-beam synthesizer, Polarization Controller
Output end is connect with the continuous amplifying unit input terminal of high power, the input terminal and the continuous amplifying unit output end of high power of bundling device
Connection；Wherein
Optical delay line controls the equivalent optical path of the road the light path Shi Ge laser of corresponding road laser；
Phase-modulator locks the phase of each road laser to setting value；
The polarization state that Polarization Controller controls the road the polarization state Shi Ge laser of corresponding road laser is consistent；
Carrier frequency is carried out heterodyne in each road laser of arithmetic progression distribution and closes beam by beam synthesis.
7. a kind of high-average power mode-locked laser production method based on system described in claim 1 characterized by comprising
By the equal multi-path laser of single-frequency or narrow linewidth continuous laser beam splitting success rate；
Beam splitting Hou Ge road laser is subjected to shift frequency, obtains the multi-path laser that carrier frequency is in arithmetic progression distribution；
The laser of each road-load wave frequency rate is subjected to independent high power laser light amplification；
Heterodyne is carried out to amplified each road laser and closes beam.
8. the method according to the description of claim 7 is characterized in that the repetition rate of the mode-locked laser obtained is usually in ten KHz
To ten GHz magnitudes.
9. swashing the method according to the description of claim 7 is characterized in that obtaining carrier frequency in the multichannel of arithmetic progression distribution
Light.
10. the method according to the description of claim 7 is characterized in that the road power amplification Qian Duige laser proceeds as follows:
Control the equivalent optical path of the road the light path Shi Ge laser of corresponding road laser；
The phase of each road laser is locked to setting value；
The polarization state for controlling the road the polarization state Shi Ge laser of corresponding road laser is consistent.
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| CN114501768A (en) * | 2022-01-30 | 2022-05-13 | 清华大学 | Accelerator charged particle beam current compression device and method |
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| US8982450B2 (en) * | 2011-09-14 | 2015-03-17 | Massachusetts Institute Of Technology | Methods and apparatus for broadband frequency comb stabilization |
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| CN103066487A (en) * | 2012-12-25 | 2013-04-24 | 中国科学院长春光学精密机械与物理研究所 | Device and method of generating high-power optical heterodyning laser interference mode |
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