CN109031852A - All solid state femtosecond laser frequency comb system - Google Patents
All solid state femtosecond laser frequency comb system Download PDFInfo
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- CN109031852A CN109031852A CN201810919211.3A CN201810919211A CN109031852A CN 109031852 A CN109031852 A CN 109031852A CN 201810919211 A CN201810919211 A CN 201810919211A CN 109031852 A CN109031852 A CN 109031852A
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- femtosecond laser
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
-
- 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
- H01S3/0078—Frequency filtering
-
- 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
- H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
-
- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
Abstract
The present invention provides a kind of all solid state femtosecond laser frequency comb system, comprising: all solid state femtosecond laser, the laser for being 1000-1100nm for output center wavelength；Octave supercontinuum generation device, receives the laser of all solid state femtosecond laser output, and generates octave super continuous spectrums；Acousto-optic frequency shifters device, for the octave super continuous spectrums to be divided into zero-order diffraction light and negative one grade diffraction light；Self-reference f-2f interferometer in ring for receiving the zero-order diffraction light, and generates carrier_envelop phase offset frequency signal；The carrier_envelop phase offset frequency signal is fed back to the acousto-optic frequency shifters device by electronic feedback unit, to lock the carrier_envelop phase offset frequency of the negative one grade diffraction light.All solid state femtosecond laser frequency comb of the invention uses preceding feedback lock, and structure is simple, at low cost, servo belt is wide, noise is low, stability and high reliablity.
Description
Technical field
The invention belongs to femtosecond laser technology field more particularly to a kind of all solid state femtosecond laser frequency comb systems.
Background technique
The rapid update of the rapid development of ultrafast laser technique, especially femtosecond laser technology is drawn for numerous scientific research fields
Entered new tool, the important in inhibiting in the observation of transient absorption ultrafast phenomena and the research such as delicate metering, meanwhile, also for
The application such as industrial processes provides new means.When laser transmits in resonant cavity, due to the difference of Phase and group velocities, lead
There are phase offsets for the envelope of pulse and the carrier wave under envelope when causing to transmit, and the phase between this carrier wave and envelope is referred to as to carry
Wave envelope phase (Carrier-envelop Phase, CEP).Influenced by environment etc., carrier envelope phase between pulse ceaselessly
Variation, when reaching even sub- period magnitude of several periods in the period of laser pulse intercarrier, control carrier envelope phase becomes
It is particularly important.However obtain carrier envelope phase numerical value from time domain and realize that regulation is nearly impossible, usually in frequency domain
On discuss.Femto-second laser pulse sequence shows as a series of equally spaced, discrete " lines ", each " line " on frequency domain
A kind of corresponding longitudinal mode mode, these lines appear to a comb, therefore referred to as femtosecond laser frequency comb.Through deriving, frequency
Interval on domain between longitudinal mode is the repetition rate f of laserrep, and whole spectral line is relative to the initial frequency displacement of zero point
Carrier_envelop phase offset frequency fceo.The reflection of carrier phase envelope frequency be carrier_envelop phase offset between pulse variable quantity, i.e. pulse
Between CEP variable quantity.Usually we obtain the frequency and repetition rate of carrier_envelop phase offset by some way, and are locked
It is fixed, so that it may to obtain stable frequency comb, have important application in accurate measurement and chirped pulse generate.
In recent years, all solid state femto-second laser that central wavelength is 1000~1100nm is by its high power, low cost etc.
Advantage receives extensive concern, and all solid state femtosecond laser frequency comb is also hot spot concerned by people.Currently, all solid state femtosecond optics frequency
Rate comb is mainly locked using phase-locked loop circuit, since the feedback bandwidth of phaselocked loop limits, causes to exist outside its feedback bandwidth a large amount of
Not repressed noise, locking effect is undesirable, in addition, all solid state femtosecond laser frequency comb knot locked using phase-locked loop circuit
Structure is complicated, these disadvantages all limit the application of all solid state femtosecond laser frequency comb.
Summary of the invention
Therefore, it is an object of the invention to overcome the defect of the above-mentioned prior art, a kind of all solid state femtosecond optics frequency is provided
Rate combs system, comprising:
All solid state femtosecond laser, the laser for being 1000-1100nm for output center wavelength；
Octave supercontinuum generation device, receives the laser of all solid state femtosecond laser output, and generates
Octave super continuous spectrums；
Acousto-optic frequency shifters device, for the octave super continuous spectrums to be divided into zero-order diffraction light and negative one grade diffraction light；
Self-reference f-2f interferometer in ring for receiving the zero-order diffraction light, and generates carrier_envelop phase offset frequency
Rate signal；
The carrier_envelop phase offset frequency signal is fed back to the acousto-optic frequency shifters device by electronic feedback unit, with lock
The carrier_envelop phase offset frequency of the fixed negative one grade diffraction light.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that all solid state femtosecond laser is
The all solid state kerr lens mode locking laser of femtosecond.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that the octave supercontinuum generation dress
It is set to photonic crystal fiber.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that the acousto-optic frequency shifters device includes sound
Luminescent crystal and sonic generator.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that self-reference f-2f interferometer in ring
Include:
Dichroic mirror, for the zero-order diffraction light of input to be divided into the first light beam and the second light beam；
Frequency-doubling crystal, for first light beam to be carried out frequency multiplication；
Prism pair, for second light beam to be delayed；And
Polarization splitting prism closes beam beat frequency for carrying out first light beam and second light beam, to generate carrier wave
Envelope phase shifting frequencies signal.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that the electronic feedback unit includes band logical
Filter, frequency mixer and radio frequency amplifier, the frequency mixer are used for the carrier_envelop phase offset frequency of the band-pass filter
Rate signal is mixed with external reference signal.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that further include local signal generator, be used for
Generate the external reference signal.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that further include the outer self-reference f-2f interference of ring
Instrument device, for receiving the negative one grade diffraction light and generating carrier_envelop phase offset frequency signal.
All solid state femtosecond laser frequency comb system according to the present invention, it is preferable that the outer self-reference f-2f interferometer of the ring
Device includes:
Dichroic mirror, for the negative one grade diffraction light of input to be divided into the first light beam and the second light beam；
Frequency-doubling crystal, for first light beam to be carried out frequency multiplication；
Prism pair, for second light beam to be delayed；And
Polarization splitting prism closes beam beat frequency for carrying out first light beam and second light beam, to generate carrier wave
Envelope phase shifting frequencies signal.
Compared with prior art, all solid state femtosecond laser frequency comb of the invention uses preceding feedback lock, structure is simple, at
This is low, servo belt is wide, noise is low, stability and high reliablity.Compared to optical-fiber laser frequency comb, all solid state femtosecond optical frequency
The nonlinear effect of comb is small, mutually makes an uproar that lower, structure is more compact, is easily achieved short cavity high repetition frequency, and directly uses Gao Gong
Rate pumping source pumps to obtain high power laser light output, it is easy to accomplish low noise high power optical frequency comb.
Detailed description of the invention
Embodiments of the present invention is further illustrated referring to the drawings, in which:
Fig. 1 is the structural schematic diagram according to all solid state femto-second laser pulse optical frequency com of the embodiment of the present invention；
Fig. 2 is the octave super continuous spectrums generated according to the supercontinuum generation device 2 of the embodiment of the present invention；
Fig. 3 is the operation principle schematic diagram according to the acousto-optic frequency shifters of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram according to self-reference f-2f interferometer in the ring of the embodiment of the present invention；
Fig. 5 shows the carrier_envelop phase offset frequency of negative one grade diffraction light according to an embodiment of the present invention；
Fig. 6 is the phase noise power spectrum density and integral phase according to the carrier_envelop phase offset frequency of the embodiment of the present invention
Noise curve figure；And
Fig. 7 shows the carrier_envelop phase offset frequency after locking according to an embodiment of the present invention and changes with time.
Specific embodiment
In order to make the purpose of the present invention, technical solution and advantage are more clearly understood, and are passed through below in conjunction with attached drawing specific real
Applying example, the present invention is described in more detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
Fig. 1 is the structural schematic diagram of all solid state femto-second laser pulse optical frequency com according to an embodiment of the present invention, packet
It includes: all solid state femtosecond laser 1, octave supercontinuum generation device 2, acousto-optic frequency shifters 3, self-reference f-2f interference in ring
The circuit of the compositions such as the outer self-reference f-2f interferometer 5 of instrument device 4, ring, bandpass filter, frequency mixer, radio frequency amplifier is anti-
Present unit 6 and local radio-frequency signal generator 7.
All solid state femtosecond laser 1 be all solid state kerr lens mode locking laser of femtosecond, including pumping source and laser it is humorous
Shake chamber.Pumping source provides pump light for the gain crystal of laser and forms population inversion, and laser resonator is increased by solid-state laser
Beneficial medium, pumping focus lamp, dispersion compensation mirror, output coupling mirror are constituted, and are based on kerr lens mode locking principle, the femtosecond is all solid state
Oscillator output power is in 250 milliwatts or so, and for the central wavelength of pulse at 1048 nanometers, pulse width is about 57fs, repeats frequency
Rate is 84MHz.
Supercontinuum generation device 2 includes photonic crystal fiber.The laser that all solid state femtosecond laser 1 exports is through lens
It is coupled into photonic crystal fiber, generates the octave supercontinum of 700 nanometers to 1400 nanometers of covering, root as shown in Figure 2
The octave super continuous spectrums generated according to the supercontinuum generation device 2 of the embodiment of the present invention.
Acousto-optic frequency shifters device 3 mainly includes acousto-optic crsytal and sonic generator, the work of acousto-optic frequency shifters as shown in Figure 3
Make schematic illustration, in 2 watts, the 80 megahertzs of rf frequency f that electronic feedback unit 6 exportsRFUnder driving, pass through super company therein
With sound wave acoustooptical effect occurs for continuous spectrum in acousto-optic crsytal, and diffraction is divided into two-beam: zero-order diffraction light and negative one grade diffraction light,
Zero-order diffractive optical transmission direction and frequency do not change, and negative one grade diffraction light direction deviates certain angle, and light frequency also occurs
Certain deviation, offset are exactly equal to 80 megahertzs of RF drive frequencies.
Self-reference f-2f interferometer 4 in ring is as shown in figure 4, include that dichroic mirror 8 is (high to the wavelength of 500~980nm
Instead, thoroughly to the wavelength height of 1000~1500nm), the first reflecting mirror 9 (to the wavelength high reflection of 1400nm), vitreous silica delay rib
Mirror is to the 10, second reflecting mirror 11 (to the wavelength high reflection of 700nm), 12 (focal length 11mm, to 1400nm's of the first non-spherical lens
Wavelength is high thoroughly), barium metaborate (BBO) frequency-doubling crystal 13, the second non-spherical lens 14 (focal length 8mm, it is high to the wavelength of 700nm
Thoroughly), polarization splitting prism 15 (high to the wavelength of 650~950nm saturating), 700nm optical filter 16 and avalanche photodide
17.Zero-order diffractive supercontinum by dichroic mirror 8 by 1400 nanometers of long wave fundamental components and 700 nanometers of shortwave fundamental components at
Two beams, 700 nanometers of shortwave fundamental components pass through BBO times to delay, 1400 nanometers of long wave fundamental components are adjusted by delay prism
Frequency crystal 13 obtains 700 nanometers of frequency multiplication ingredients, and 700 nanometers of fundamental components and 700 nanometers of frequency multiplication ingredients pass through polarization splitting prism
15 close beam, and by 700nm optical filter 16, finally detection obtains 20 megahertzs, signal-to-noise ratio 38dB on avalanche photodide 17
Carrier_envelop phase offset beat signal.
The outer self-reference f-2f device 5 of ring is identical as self-reference f-2f 4 structures of interferometer in ring.In avalanche photodide
The carrier_envelop phase offset signal locked outside the ring that detection obtains 60MHz, signal-to-noise ratio is 38dB, and the phase measured after its locking is made an uproar
Power sound spectrum density and frequency time stability.
Electronic feedback unit 6 includes bandpass filter 61, frequency mixer 62 and radio frequency amplifier 63, and detection in ring is obtained
20 MHz carrier envelope phase shifting frequencies signals are filtered through 20 megahertz bandpass filters 61, with local radio-frequency signal generator 7
It issues 60 megahertzs of external reference signal to be mixed in frequency mixer 62, obtains 80 megahertzs of mixed frequency signals of -40dBm, then pass through
Multistage 80 megahertzs of radio frequency amplifying circuits 63, are amplified to 2 watts, 80 megahertzs for the mixed frequency signal comprising carrier_envelop phase offset frequency
Signal drive acousto-optic frequency shifters 3.Under stable 80 megahertzs of rf frequencies driving, two beam diffraction lights are respectively through in ring and ring
The carrier_envelop phase offset frequency that outer self-reference f-2f interferometer detects all is the carrier_envelop phase offset frequency under free-running, packet
Containing high noise and rapid frequency drift.If at this time by the carrier_envelop phase offset frequency of the 20MHz in ring and stable 60
Megahertz reference signal is mixed to obtain 80 megahertzs of driving signals driving acousto-optic frequency shifters, then the light frequency of negative one grade diffraction light
80 megahertzs will be equally deviated, however 80 megahertzs of this offset include the letter of the carrier_envelop phase offset frequency freely converted
Breath, therefore the optical frequency for being equivalent to negative one grade has been subtracted variation carrier phase frequency and its noise, then the optical frequency of negative one grade
Carrier_envelop phase offset frequency is locked and noise is greatly inhibited.Specifically, in an embodiment of the present invention, by will be in ring
Into acousto-optic frequency shifters, the carrier_envelop phase offset frequency of negative one grade diffraction light is stabilized in carrier_envelop phase offset frequency feedback
At 60mHz, the carrier_envelop phase offset frequency of negative one grade diffraction light according to an embodiment of the present invention as shown in Figure 5, wherein frep
For the pulse recurrence frequency of femtosecond all solid state laser, fceoIt is femtosecond all solid state laser through self-reference f-2f interferometer measurement
Obtained carrier_envelop phase offset frequency, RBW are measuring instrument-spectrum analyzer resolution bandwidth.
Local signal generator 7 provides the stable external reference signal that intensity is 7dBm, frequency is 60MHz for system.
In order to embody effect of the invention, inventor is tested real according to the present invention using self-reference f-2f device 5 outside ring
The phase noise power spectrum density and integrated phase noise curve graph of the carrier_envelop phase offset frequency of example are applied, as shown in fig. 6, can be with
Find out, the integrated phase noise of the carrier_envelop phase offset frequency after locking is suppressed in the level of substrate, about 79.3mrad.
In addition, the carrier_envelop phase offset frequency that inventor has also monitored after locking changes with time, as shown in Figure 7, it can be seen that
In 2 hours, frequency changes in ± 40mHz.The above test result suffices to show that all solid state femtosecond optics frequency according to the present invention
The stability and reliability of rate comb system.Reliable and stable all solid state femtosecond laser frequency comb system is in accurate measurement and Ah 's arteries and veins
Punching has important application in generating.
The outer self-reference f-2f device 5 of ring is used for subsequent performance test, is all solid state preposition feedback optical frequency comb of femtosecond
Index evaluation device, the noise and frequency stability of the carrier_envelop phase offset frequency after measurement locking, the light comb for after
Using providing accurate standard.
According to other embodiments of the invention, all solid state femtosecond laser 1 selects femtosecond well known in the art all solid state
Laser, central wavelength in 1000~1100nm, such as: be based on Yb:CYA (yttrium-calcium aluminate for mixing ytterbium) crystal all-solid state laser
Device is based on all solid state laser of Yb:CGA (the aluminic acid gadolinium calcium for mixing ytterbium) crystal, is based on Yb:KGW (mixing ytterbium Gadolinium Tungstate potassium) crystal
Femtosecond all solid state laser, the 1um solid-state laser such as all solid state laser based on Yb:KYW (mixing ytterbium Potassium Yttrium Tungstate) crystal.
In the present invention, the carrier_envelop phase offset frequency signal that self-reference f-2f interferometer in ring generates is fed back to
Acousto-optic frequency shifters realize stable all solid state femtosecond optical frequency to lock the carrier_envelop phase offset frequency of negative one grade diffraction light
Comb.
All solid state femtosecond laser frequency comb according to the present invention uses preceding feedback lock, and structure is simple, at low cost, servo belt
It is wide, noise is low, stability and high reliablity.Compared to optical-fiber laser frequency comb, all solid state femtosecond laser frequency comb it is non-linear
Effect is small, mutually makes an uproar that lower, structure is more compact, is easily achieved short cavity high repetition frequency, and is directly pumped with high power pumping source
Obtain high power laser light output, it is easy to accomplish low noise high power optical frequency comb.
Although the present invention has been described by means of preferred embodiments, the present invention is not limited to described here
Embodiment, without departing from the present invention further include made various changes and variation.
Claims (9)
1. a kind of all solid state femtosecond laser frequency comb system, comprising:
All solid state femtosecond laser, the laser for being 1000-1100nm for output center wavelength；
Octave supercontinuum generation device, receives the laser of all solid state femtosecond laser output, and generates frequency multiplication
Journey super continuous spectrums；
Acousto-optic frequency shifters device, for the octave super continuous spectrums to be divided into zero-order diffraction light and negative one grade diffraction light；
Self-reference f-2f interferometer in ring for receiving the zero-order diffraction light, and generates carrier_envelop phase offset frequency letter
Number；
The carrier_envelop phase offset frequency signal is fed back to the acousto-optic frequency shifters device, to lock by electronic feedback unit
State the carrier_envelop phase offset frequency of negative one grade diffraction light.
2. all solid state femtosecond laser frequency comb system according to claim 1, wherein all solid state femtosecond laser
For all solid state kerr lens mode locking laser of femtosecond.
3. total solids femtosecond laser frequency comb system according to claim 1, wherein the octave supercontinuum generation
Device is photonic crystal fiber.
4. all solid state femtosecond laser frequency comb system according to claim 1, wherein the acousto-optic frequency shifters device includes
Acousto-optic crsytal and sonic generator.
5. all solid state femtosecond laser frequency comb system according to claim 1, wherein self-reference f-2f interferometer fills in ring
It sets and includes:
Dichroic mirror, for the zero-order diffraction light of input to be divided into the first light beam and the second light beam；
Frequency-doubling crystal, for first light beam to be carried out frequency multiplication；
Prism pair, for second light beam to be delayed；And
Polarization splitting prism closes beam beat frequency for carrying out first light beam and second light beam, to generate carrier envelope
Phase shifting frequencies signal.
6. all solid state femtosecond laser frequency comb system according to claim 1, wherein the electronic feedback unit includes band
Bandpass filter, frequency mixer and radio frequency amplifier, the frequency mixer are used for the carrier_envelop phase offset of the band-pass filter
Frequency signal is mixed with external reference signal.
7. all solid state femtosecond laser frequency comb system according to claim 6, further includes local signal generator, for producing
The raw external reference signal.
8. total solids femtosecond laser frequency comb system described in any one of -7 according to claim 1 further includes the outer self-reference of ring
F-2f interferometer, for receiving the negative one grade diffraction light and generating carrier_envelop phase offset frequency signal.
9. total solids femtosecond laser frequency comb system according to claim 8, the outer self-reference f-2f interferometer dress of the ring
It sets and includes:
Dichroic mirror, for the negative one grade diffraction light of input to be divided into the first light beam and the second light beam；
Frequency-doubling crystal, for first light beam to be carried out frequency multiplication；
Prism pair, for second light beam to be delayed；And
Polarization splitting prism closes beam beat frequency for carrying out first light beam and second light beam, to generate carrier envelope
Phase shifting frequencies signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813451A (en) * | 2019-03-01 | 2019-05-28 | 中国科学院物理研究所 | The all phase measurement of ultrashort pulse and locking means and corresponding device |
| CN113991413A (en) * | 2021-10-13 | 2022-01-28 | 中国航空工业集团公司北京长城计量测试技术研究所 | Optical frequency comb carrier envelope offset frequency locking device and method |
| CN117239529A (en) * | 2023-11-16 | 2023-12-15 | 长春理工大学 | High-repetition-frequency anhydrous air-cooling-free laser based on acoustic-optical path regulation and control and output method |
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| JP2011002580A (en) * | 2009-06-17 | 2011-01-06 | Nippon Telegr & Teleph Corp <Ntt> | Light source and method for stabilizing optical frequency comb |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113991413A (en) * | 2021-10-13 | 2022-01-28 | 中国航空工业集团公司北京长城计量测试技术研究所 | Optical frequency comb carrier envelope offset frequency locking device and method |
| CN113991413B (en) * | 2021-10-13 | 2024-04-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Device and method for locking optical frequency comb carrier envelope offset frequency |
| CN117239529A (en) * | 2023-11-16 | 2023-12-15 | 长春理工大学 | High-repetition-frequency anhydrous air-cooling-free laser based on acoustic-optical path regulation and control and output method |
| CN117239529B (en) * | 2023-11-16 | 2024-01-23 | 长春理工大学 | High-repetition-frequency anhydrous air-cooling-free laser based on acoustic-optical path regulation and control and output method |
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Application publication date: 20181218 |