CN106848824B - A kind of integrated laser system and method - Google Patents
A kind of integrated laser system and method Download PDFInfo
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- CN106848824B CN106848824B CN201710209757.5A CN201710209757A CN106848824B CN 106848824 B CN106848824 B CN 106848824B CN 201710209757 A CN201710209757 A CN 201710209757A CN 106848824 B CN106848824 B CN 106848824B
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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
- H01S3/10061—Polarization control
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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
- H01S3/10084—Frequency control by seeding
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention discloses a kind of integrated laser system and its working methods, including mounting plate, it is provided with the laser diode as light source on a mounting board, the first convex lens, shaping prism, the first reflecting mirror, laser isolator, the one 1/2 wave plate and the first polarization beam splitter prism are disposed on the emitting light path of the laser diode.The method have the benefit that: the present invention uses integrated design, realize frequency and power stability pulse pumping and exploring laser light, it is exported after expanding by polarizing film, can satisfy pumping and the detection needs of rubidium atomic clock, light source is minimized, is convenient for carrying, high stable is anti-interference.
Description
Technical field
The invention belongs to Technology of Atomic Frequency Standards fields, are related to laser system, especially a kind of integrated laser system and side
Method is suitable for atomic frequency standard, light and atomic interaction and tests.
Background technique
Since the laser invention sixties in last century, have widely in various aspects such as scientific research, medicine, military affairs
Application.Laser becomes New type atom clock and studies essential tool, the laser cooling and trapping atoms skill based on laser application
Art, narrow-linewidth laser technology, pulsed laser technique and optical comb technology etc. have pushed the development of atomic clock significantly, thus small-sized sharp
The development of photosystem becomes the hot spot and key in atomic clock field in recent years.Currently, Paris, FRA observatory is caesium cold atomic clock
The small-sized optical filter feedback external cavity semiconductor laser that HORACE is developed, volume only have 65mm × 99mm × 37mm, much smaller than biography
System laser, line width reach 300kHz.French CNES is that cesium-beam atomic clock PHARAO in space has succeeded in developing miniature laser system, entirely
Laser part uses integrated design, and grating external cavity semiconductor laser can be tuned automatically with good anti-seismic performance.SwitzerlandUniversity's temporal frequency laboratory (LTF) is in the research of miniature laser pumping rubidium atomic clock, using two pole of DFB laser
Pipe carries out shift frequency to pumping laser as light source, using AOM, entire opticator include rubidium saturated absorption volume be 10cm ×
12.5cm×17.5cm。
The present invention is applied to laser pulse pumping, microwave pulse excitation, atom free inbroduction decay signal or optical detection
The integrated laser system of the novel rubidium atomic clock of scheme.The laser system of current this novel rubidium atomic clock is all desktop system
System, optical component are placed on optical platform, and volume is bigger, and quicker for the variation of vibration and external environment
Sense；Secondly optical detection, microwave sounding and polarised light detection method are used, each not phase of the laser system of each research institution
Together, it is unfavorable for the research of atomic clock performance and the raising of Stability index.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of integrated laser system and method are provided,
Its is easy to use, be affected by the external environment power and frequency small, that can be achieved at the same time optical detection, microwave sounding and polarization optical detection
Rate is stablized.
The purpose of the present invention is achieved through the following technical solutions:
This integrated laser system, including mounting plate are provided with the laser diode as light source, institute on a mounting board
State be disposed on the emitting light path of laser diode the first convex lens, shaping prism, the first reflecting mirror, laser isolator,
One 1/2 wave plate and the first polarization beam splitter prism；
First polarization beam splitter prism is perpendicular to being provided with second polarization spectro rib on the road a transmitted light path of optical axis
Mirror is disposed with atomic bubble, the first quarter wave plate and the first total reflection on the reflected light path of second polarization splitting prism
Eyeglass；The first photodetector is provided in the transmitted light optical path of second polarization splitting prism；
First polarization beam splitter prism, which is parallel on the road the b transmitted light path of optical axis, is disposed with the second reflecting mirror,
Two convex lenses, third polarization splitting prism, first sound-optic modulator, third convex lens, the second quarter wave plate and the second total reflection
Mirror；Partially reflecting mirror, the transmitted light of the partially reflecting mirror are additionally provided in the left optical path of the third polarization splitting prism
Road is provided with the second photodetector；The 5th convex lens, the 4th are disposed on the reflected light path of the partially reflecting mirror
Convex lens and polarizing film.
The laser diode output facula is the strip of diverging.
The left side of mounting plate is arranged in the laser diode.
Laser diode, the first convex lens and shaping prism, which are arranged separately on a bottom plate, carries out list
Only temperature control and isolation.
The isolation of the laser isolator is 60dB.
The focal length of second convex lens is 4.5mm；The focal length of third convex lens is 4.5mm.
A kind of working method of integrated laser system, it is characterised in that:
Laser diode output facula be diverging strip, after the first convex lens is collimated, become one it is ellipse
Round directional light, shaping prism carry out shaping to laser, obtain a circular hot spot；
The output light of shaping prism pair is changed by laser isolator, laser isolator output light by the one 1/2 wave plate
The polarization direction of emergent light, the emergent light after the one 1/2 wave plate are incident on the first polarization beam splitter prism, laser are divided into
The road a reflected light perpendicular to optical axis and it is parallel to the road the b transmitted light of optical axis；
It is incident on second polarization splitting prism downwards perpendicular to the road a light of optical axis, the second polarization splitting prism is to laser
It is reflected, reflected light to the left side successively passes through atomic bubble and realizes the interaction of laser and atom, the first quarter wave plate to laser
Polarization state rotation, first total reflection eyeglass realize laser reflection；Laser backtracking successively passes through the one 1/4 wave after reflection
Piece and atomic bubble are incident on the second polarization splitting prism, and by the first quarter wave plate twice, the polarization state of laser is by reflected light
Become transmitted light, on the first photodetector after being incident on the second polarization splitting prism, obtains the hyperfine transition of rubidium atom
Saturation-absorption spectrum；Add a modulated signal in the driving current of laser diode, then the first photodetector is obtained
Atom saturated absorption signal is demodulated, and obtains error signal, error signal feeds back the current controling end to laser diode, real
The now locking to laser frequency relative to rubidium atom hyperfine transition frequency；
The road the b transmitted light of optical axis is parallel to after the second reflecting mirror, passes through the second convex lens downwards, the second convex lens will swash
Light focuses on first sound-optic modulator center；It is all saturating that the emergent light of second convex lens is incident on third polarization splitting prism laser
It penetrates；Transmitted light is incident on first sound-optic modulator；The output light of first sound-optic modulator is become collimated light beam by third convex lens,
Be incident on after the second quarter wave plate on the second total reflection mirror, after the second total reflection mirror, the road b transmitted light along backtracking,
The second quarter wave plate is again passed by, polarization state becomes reflected light, is incident on third convex lens, focuses on first sound-optic modulator
Center, after being then divided by third polarization splitting prism, reflected light exports to the left；Pass through the drive to first sound-optic modulator
Dynamic radio frequency source carries out impulse modulation and amplitude modulation, obtains the pulse laser figure for atomic clock pumping and pumping；
Reflected light is incident on first part's reflecting mirror to the left, and transmitted light part is detected by the second photodetector, realizes and swashs
The locking of optical power；Reflected light passes through the 4th convex lens and the 5th convex lens, is realized and is swashed by the spacing of two convex lenses of tuning
Light expands, and exports after expanding by the first polarizing film, realizes the polarised light of the High Extinction Ratio for atomic clock detection.
The atomic bubble (17) is rubidium bubble.
Compared to the prior art the present invention, has following advantageous effects:
1, the present invention uses integrated design, frequency and power stability pulse pumping and exploring laser light is realized, after expanding
It is exported by polarizing film, can satisfy pumping and the detection needs of rubidium atomic clock, light source is minimized, is convenient for carrying, high stable is anti-
Interference.
2, the pedestal of entire opticator uses integrated design in the present invention, is required according to optical path height and light-emitting window,
Suitable pedestal is milled out in the corresponding position of different optical devices, is fixed after adjustment is accurate with epoxide-resin glue.Outside laser
At shell, interlock circuit interface and out light through-hole and window mirror are reserved.
3, pulse pumping laser and pulse detection laser are realized by AOM modulation system；
4, laser diode output frequency is locked on the transition line of atom by saturated absorption method, realizes laser two
The frequency of pole pipe locks automatically；
5, the output laser power after AOM shift frequency is stablized, obtains the laser of power stability；
6, the laser after AOM shift frequency is expanded, while uses polarizing film, obtain large spot linearly polarized light；
7, whole system is designed using integrated machine, is realized the miniaturization of laser system and is integrated.
Detailed description of the invention
The block diagram of the integrated laser system of Fig. 1；
The hyperfine transition spectral line of Fig. 2 rubidium atom；
The error signal and detector output of Fig. 3 laser frequency locking；
The pulse pumping laser and pulse detection laser of the output of Fig. 4 oscilloscope measurement；
Laser power after Fig. 5 locking rises and falls.
Wherein: 1 is laser diode；2 be the first convex lens (collimation lens)；3 be shaping prism；4 be the first reflecting mirror；
5 be laser isolator；6 be the one 1/2 wave plate；7 be the first polarization beam splitter prism；8 be the second reflecting mirror；9 be the second convex lens；
10 be third polarization splitting prism；11 be acousto-optic modulator；12 be third convex lens；13 be the second quarter wave plate；14 is complete for second
Reflecting mirror；15 be the first photodetector；16 be the second polarization splitting prism；17 be atomic bubble；18 be the 4th convex lens；19 are
Polarizing film；20 be the 5th convex lens；21 be partially reflecting mirror；22 be the first quarter wave plate；23 be the first total reflection mirror；24 be
Two photodetectors；25 be laser head module；26 be mounting plate.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1-5, a kind of integrated laser system, including mounting plate 26,26 upper left side of mounting plate is provided with conduct
The laser diode 1 of light source, be disposed on the emitting light path of the laser diode 1 first convex lens 2, shaping prism 3,
First reflecting mirror 4, laser isolator 5, the one 1/2 wave plate 6 and the first polarization beam splitter prism 7；
First polarization beam splitter prism 7 is perpendicular to being provided with second polarization spectro rib on the road a transmitted light path of optical axis
Mirror 16 is disposed with atomic bubble 17, the first quarter wave plate 22 and on the reflected light path of second polarization splitting prism 16
One total reflection eyeglass 23；The first photodetector 15 is provided in the transmitted light optical path of second polarization splitting prism 16；
First polarization beam splitter prism 7 be parallel on the road the b transmitted light path of optical axis be disposed with the second reflecting mirror 8,
Second convex lens 9, third polarization splitting prism 10, first sound-optic modulator 11, third convex lens 12,13 and of the second quarter wave plate
Second total reflection mirror 14；Partially reflecting mirror 21, the portion are additionally provided in the left optical path of the third polarization splitting prism 10
Divide on the transmitted light path of reflecting mirror 21 and is provided with the second photodetector 24；On the reflected light path of the partially reflecting mirror 21 successively
It is provided with the 5th convex lens 20, the 4th convex lens 18 and polarizing film 19.
1 output facula of laser diode is the strip of diverging.
The left side of mounting plate 26 is arranged in the laser diode 1.
Laser diode 1, the first convex lens 2 and shaping prism 3 are arranged separately on a bottom plate
Carry out individual temperature control and isolation.
The isolation of the laser isolator 5 is 60dB.
The focal length of second convex lens 9 is 4.5mm；The focal length of third convex lens 12 is 4.5mm.
A kind of working method of integrated laser system:
1 output facula of laser diode is the strip of diverging, and laser diode 1 is the light of entire integrated laser system
Source becomes an elliptical directional light after the first convex lens 2 is collimated, and shaping prism 3 carries out shaping to laser, obtains
Obtain a circular hot spot；Laser diode 1, the first convex lens 2 and shaping prism are arranged separately on a bottom plate to 3, right
It carries out individual temperature control and isolation, enhances the stability of laser, while being convenient for changing laser diode；
Shaping prism passes through laser isolator 5 to 3 output light, and isolation 60dB prevents feedback influence laser activity.
5 output light of laser isolator changes the polarization direction of emergent light by the one 1/2 wave plate 6, going out after the one 1/2 wave plate 6
It penetrates light to be incident on the first polarization beam splitter prism 7, laser is divided into the road a reflected light perpendicular to optical axis and is parallel to the b of optical axis
Road transmitted light；By the light intensity for rotating the one 1/2 the wave plate adjustable road a reflected light and the road b transmitted light.
It is incident on second polarization splitting prism 16 downwards perpendicular to the road a light of optical axis, the second polarization splitting prism 16 is right
Laser is reflected, and reflected light to the left side successively passes through interaction, the first quarter wave plate that atomic bubble 17 realizes laser and atom
The reflection of laser is realized in the polarization state rotation of 22 pairs of laser, the first total reflection eyeglass 23；Laser backtracking successively passes through after reflection
The first quarter wave plate 22 and atomic bubble 17 are crossed, is incident on the second polarization splitting prism 16, by the first quarter wave plate 22 twice, is swashed
The polarization state of light becomes transmitted light from reflected light, on the first photodetector 15 after being incident on the second polarization splitting prism 16,
Obtain the hyperfine transition saturation-absorption spectrum of rubidium atom；Add a modulated signal in the driving current of laser diode 1, then
The atom saturated absorption signal obtained to the first photodetector 15 demodulates, and obtains error signal, and error signal feedback arrives
The current controling end of laser diode 1 realizes the locking (figure to laser frequency relative to rubidium atom hyperfine transition frequency
3)；
The road the b transmitted light of optical axis is parallel to after the second reflecting mirror 8, passes through the second convex lens 9, the second convex lens 9 downwards
Focal length is 4.5mm, and laser is focused on 11 center of first sound-optic modulator, improves the diffraction efficiency of AOM；Second convex lens 9
Emergent light is incident on 10 laser of third polarization splitting prism and all transmits；Transmitted light is incident on first sound-optic modulator 11, and first
Acousto-optic modulator (AOM) 11 realizes impulse modulation and shift frequency to laser, and acousto-optic modulator used (AOM) frequency is 80MHz；
The emergent light of first sound-optic modulator (AOM) 11 is incident on third convex lens 12；The focal length of third convex lens 12 is also 4.5mm,
The output light of first sound-optic modulator 11 is become collimated light beam by third convex lens 12, is incident on after the second quarter wave plate 13
On second total reflection mirror 14, after the second total reflection mirror 14, the road b transmitted light again passes by the second quarter wave plate along backtracking
13, polarization state becomes reflected light, is incident on third convex lens 12, focuses on the center of first sound-optic modulator 11, then by
After three polarization splitting prisms 10 are divided, reflected light exports to the left；Pass through the driving radio frequency source to first sound-optic modulator 11
Impulse modulation and amplitude modulation are carried out, pulse laser Fig. 4 for atomic clock pumping and pumping is obtained；
Reflected light is incident on first part's reflecting mirror 21 to the left, and transmitted light part is detected by the second photodetector 24, real
The locking of laser power, the laser power after locking are shown in Fig. 5 after existing AOM；Reflected light is convex by the 4th convex lens (18) and the 5th
The focal length of lens 20, the 4th convex lens is 10mm, and the focal length of the 5th convex lens is 100mm, by between two convex lenses of tuning
Away from expanding for laser is realized, the laser spot diameter expanded is 20mm, exports after expanding by the first polarizing film 19, realizes and use
In the polarised light of the High Extinction Ratio of atomic clock detection.
The atomic bubble 17 is rubidium bubble.
The present invention flows influence to laser temperature to reduce air, laser diode and collimation lens part into
Isolation is gone, in order to reduce influence of the atomic bubble temperature change to atomic spectral line, bubble has carried out temperature control.Al-alloy casing carries out
Destressing design, anti-optical path deformation design, resisting temperature variation design, sealing and dustproof design.The whole integrated, miniaturization of light source,
Be convenient for carrying, high stable it is anti-interference.
Claims (8)
1. a kind of integrated laser system, which is characterized in that including mounting plate (26), be provided on mounting plate (26) as light
The laser diode (1) in source is disposed with the first convex lens (2), shaping rib on the emitting light path of the laser diode (1)
Mirror (3), the first reflecting mirror (4), laser isolator (5), the one 1/2 wave plate (6) and the first polarization beam splitter prism (7)；
First polarization beam splitter prism (7) is perpendicular to being provided with second polarization splitting prism on the road a transmitted light path of optical axis
(16), atomic bubble (17), the first quarter wave plate are disposed on the reflected light path of second polarization splitting prism (16)
(22) and first is totally reflected eyeglass (23)；The spy of the first photoelectricity is provided in the transmitted light optical path of second polarization splitting prism (16)
It surveys device (15)；
First polarization beam splitter prism (7) be parallel on the road the b transmitted light path of optical axis be disposed with the second reflecting mirror (8),
Second convex lens (9), third polarization splitting prism (10), first sound-optic modulator (11), third convex lens (12), the 2nd 1/4
Wave plate (13) and the second total reflection mirror (14)；It is anti-that part is additionally provided in the left optical path of the third polarization splitting prism (10)
It penetrates mirror (21), is provided with the second photodetector (24) on the transmitted light path of the partially reflecting mirror (21)；The part reflection
The 5th convex lens (20), the 4th convex lens (18) and polarizing film (19) are disposed on the reflected light path of mirror (21).
2. integrated laser system according to claim 1, which is characterized in that laser diode (1) output facula
For the strip of diverging.
3. integrated laser system according to claim 1, which is characterized in that laser diode (1) setting is being pacified
The left side of loading board (26).
4. integrated laser system according to claim 1, which is characterized in that laser diode (1), the first convex lens
(2) it is arranged separately on a bottom plate with shaping prism (3) and carries out individual temperature control and isolation.
5. integrated laser system according to claim 1, which is characterized in that the isolation of the laser isolator (5)
For 60dB.
6. integrated laser system according to claim 1, which is characterized in that the focal length of second convex lens (9) is
4.5mm；The focal length of third convex lens (12) is 4.5mm.
7. a kind of working method based on integrated laser system described in claim 1-6 any one, it is characterised in that:
Laser diode (1) output facula is that the strip of diverging becomes one after the first convex lens (2) is collimated
Elliptical directional light, shaping prism (3) carry out shaping to laser, obtain a circular hot spot；
For shaping prism to the output light of (3) by laser isolator (5), laser isolator (5) output light passes through the one 1/2 wave plate
(6) change the polarization direction of emergent light, the emergent light after the one 1/2 wave plate (6) is incident on the first polarization beam splitter prism (7)
On, laser is divided into the road a reflected light perpendicular to optical axis and is parallel to the road the b transmitted light of optical axis；
It is incident on second polarization splitting prism (16) downwards perpendicular to the road a light of optical axis, the second polarization splitting prism (16) is right
Laser is reflected, and reflected light to the left side successively passes through interaction, the one 1/4 wave that atomic bubble (17) realize laser and atom
Piece (22) realizes the reflection of laser to polarization state rotation, the first total reflection eyeglass (23) of laser；Laser backtracking after reflection
Successively pass through the first quarter wave plate (22) and atomic bubble (17), is incident on the second polarization splitting prism (16), by twice first
Quarter wave plate (22), the polarization state of laser become transmitted light from reflected light, first after being incident on the second polarization splitting prism (16)
On photodetector (15), the hyperfine transition saturation-absorption spectrum of rubidium atom is obtained；Driving current in laser diode (1)
A upper plus modulated signal, the atom saturated absorption signal then obtained to the first photodetector (15) are demodulated, are missed
Difference signal, error signal feed back the current controling end to laser diode (1), realize super relative to rubidium atom to laser frequency
The locking of fine jump frequency；
The road the b transmitted light of optical axis is parallel to after the second reflecting mirror (8), passes through the second convex lens (9) downwards, the second convex lens
(9) laser is focused on into first sound-optic modulator (11) center；The emergent light of second convex lens (9) is incident on third polarization spectro
Prism (10) laser all transmits；Transmitted light is incident on first sound-optic modulator (11)；Third convex lens (12) is by the first acousto-optic
The output light of modulator (11) becomes collimated light beam, is incident on the second total reflection mirror (14) after the second quarter wave plate (13),
After the second total reflection mirror (14), the road b transmitted light again passes by the second quarter wave plate (13), polarization state becomes along backtracking
Reflected light is incident on third convex lens (12), focuses on the center of first sound-optic modulator (11), then by third polarization spectro
After prism (10) is divided, reflected light exports to the left；Arteries and veins is carried out by the driving radio frequency source to first sound-optic modulator (11)
Modulated and amplitude modulation, obtain the pulse laser figure for atomic clock pumping and pumping；
Reflected light is incident on first part's reflecting mirror (21) to the left, and transmitted light part is detected by the second photodetector (24), real
The locking of existing laser power；Reflected light passes through the 4th convex lens (18) and the 5th convex lens (20), by tuning two convex lenses
Spacing realize that laser expands, exported after expanding by the first polarizing film (19), realize the high delustring for atomic clock detection
The polarised light of ratio.
8. the working method of integrated laser system according to claim 7, it is characterised in that: the atomic bubble (17) is
Rubidium bubble.
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| CN107453203A (en) * | 2017-07-21 | 2017-12-08 | 北京航天控制仪器研究所 | A kind of miniaturization saturation-absorption spectrum device for semiconductor laser |
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| CN113644535B (en) * | 2021-06-28 | 2022-09-27 | 北京空间机电研究所 | Chaotic pulse laser |
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| JPH08335876A (en) * | 1995-06-09 | 1996-12-17 | Fujitsu Ltd | Rubidium atomic oscillator |
| JP2009218488A (en) * | 2008-03-12 | 2009-09-24 | Mitsutoyo Corp | Device, method and program for stabilizing laser frequency |
| CN103825184B (en) * | 2014-03-07 | 2016-12-07 | 北京大学 | A kind of ultra-narrow band excited state faraday anomalous dispersion atomic light filter of communication band |
| CN104682187B (en) * | 2015-03-09 | 2018-03-23 | 北京航空航天大学 | A kind of raman laser system phase noise autocompensation installation and method based on closed loop feedback |
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| CN105958316B (en) * | 2016-06-22 | 2019-01-11 | 中国科学院国家授时中心 | Semiconductor automatic freqauency stabilization laser based on Cs atom saturated absorption spectrum |
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