CN103606814A - Laser frequency stabilization realization method - Google Patents
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- CN103606814A CN103606814A CN201310585243.1A CN201310585243A CN103606814A CN 103606814 A CN103606814 A CN 103606814A CN 201310585243 A CN201310585243 A CN 201310585243A CN 103606814 A CN103606814 A CN 103606814A
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Abstract
The invention provides a laser frequency stabilization realization method. The laser frequency stabilization realization method comprises steps that: step 1, a single-block dual-wavelength laser device is utilized to output 532nm laser; step 2, an iodine saturation absorption frequency stabilization device is utilized to carry out determination processing on the 532nm laser, if a frequency of the 532nm laser deviates from a reference frequency of the iodine saturation absorption frequency stabilization device, a feedback signal is generated by the iodine saturation absorption frequency stabilization device and is sent to a servo control device, and a step 3 is carried out; if the frequency of the 532nm laser is in the reference frequency of the iodine saturation absorption frequency stabilization device, laser frequency stabilization is realized, and no processing is needed; and step 3, chamber length of the single-block dual-wavelength laser device is adjusted by utilizing the servo control device according to the feedback signal, and the frequency of the 532nm laser is made to be in the reference frequency. The laser frequency stabilization realization method greatly improves stability and reproducibility of the frequency of the laser device.
Description
Technical field
The invention belongs to laser steady frequency technology field, relate in particular to a kind of laser frequency stabilization implementation method.
Background technology
Since people utilize methane adsorption line, come after stabilized lasers frequency, the research of laser frequency stabilization has entered a new stage, and frequency stability has reached 10 soon
-11～10-
12magnitude.Along with going deep into of research, the spectral lines that are utilized and frequency-stabilizing method have been it is found that more.Iodine molecule is simple diatomic molecule, at the visible light wave range of (500～650) nm, approximately has 5000 absorption lines, and particularly, near 532nm, iodine molecule has the strong absorption line of up to a hundred.Because the iodine absorptive transition of 532nm is that ground state absorbs, absorption coefficient is large, and breadth of spectrum line is narrower than 633nm, thereby makes the signal to noise ratio of saturated absorption spectra very high.
In optical maser wavelength (frequency) standard, the stable of optical frequency is the optical frequency that the laser as light source is given off laser beam, and is stabilized in the suitable transition as the specified particle of natural reference.These specified particles have atom, ion and molecule.In these optional particles, comparatively speaking, atom or ion frequency marking have higher frequency stability, but technical sophistication is costly, and research cycle is long, installs huge.And using shaking of molecule, turn laser frequency (wavelength) stabilizing arrangement of the molecule frequency marking that the hyperfine composition in transition realizes as natural reference, although its long-term frequency stability are lower than atom or ion frequency marking, but structure is relatively simple, cost is less, more easily realize, easier miniaturization, and there is fabulous short-term frequency stability.
Summary of the invention
For addressing the above problem, the invention provides a kind of laser frequency stabilization implementation method, it can produce 1064nm, 532nm stabilized lasers that wavelength has strict multiple relation, can calibrate the wavelength linear degree of grating type spectrum.The green Frequency Stabilized Lasers of 532nm of its acquisition has the features such as wavelength stability is good, line width, and then realizes the wavelength index calibration to spectrometer S-band.The present invention makes the stability of laser frequency and reproducibility obtain large increase.
Laser frequency stabilization implementation method of the present invention comprises:
Step 1, utilize monolithic dual laser output 532nm laser, described 532nm laser incides iodine saturated absorption frequency stabilization device, wherein, described monolithic dual laser is dual wavelength output, a wavelength is single-frequency 1064nm laser, and another wavelength is the 532nm laser that described single-frequency 1064nm laser single is produced by PPKTP frequency-doubling crystal;
Step 3, utilizes described Servocontrol device to regulate the chamber of described monolithic dual laser long according to feedback signal, makes described 532nm swash light frequency in described reference frequency.
Further, described step 1 comprises:
Step 11 incides the 808nm laser of the semiconductor laser diode transmitting of monolithic dual laser in sealing monolithic resonant cavity after polarization coupling prism closes light, and excitation bonded monoblock crystal produces 1064nm laser;
Step 12, utilizes the first beam splitter prism to 808nm laser-transmitting, and to 1064nm laser reflection, the 808nm laser of transmission, after the second beam splitter prism transmission, is used electro-optical feedback noise suppression circuit, carries out the inhibition of laser intensity noise; The 1064nm laser of reflection is after the second beam splitter prism reflection, use λ/4 wave plate to do polarization state adjustment, then line focus lens enter PPKTP frequency-doubling crystal, produce 532nm laser, and the light beam after frequency multiplication passes through the spatial distribution shape that collimating lens collimates and adjusts light beam;
Step 13, utilizes the laser-transmitting of the 3rd beam splitter prism to 1064nm, to the reflection of 532nm frequency doubled light, 532nm frequency doubled light and 1064nm fundamental frequency light is spatially separated.
Further, described step 2 comprises:
Step 21,532nm laser after carrying out space polarization state adjustment, λ/4 wave plate and lens is divided into the orthogonal two-beam in polarization direction, wherein beam of laser is that pump light utilizes the electrooptic modulator of described iodine saturated absorption frequency stabilization device to modulate, and another beam of laser is not modulated for surveying light;
Step 22, enters two-beam in the ，Dian chamber, iodine chamber of described iodine saturated absorption frequency stabilization device in the same way or oppositely, and two-beam produces non-linear four wave mixing, realizes sideband transfer to unmodulated light beam by modulated beam of light;
Step 23, imports the sideband of described detection light and generation in photoelectricity differential detector, by double balanced mixer demodulation and with local oscillation signal mixing, obtain error signal, this error signal, through servo control circuit device, is divided into fast loop section and slow loop section;
Step 24, utilize the piezoelectric ceramic on fast loop section FEEDBACK CONTROL laser monolithic resonant cavity, thereby the chamber that changes laser monolithic resonant cavity by change stress is long, adjust the output frequency of monolithic laser, realize quick tracking and the locking among a small circle of monolithic laser, slow loop section feedback, on the temperature-controlling system of monolithic resonant cavity, by changing the resonance frequency of the temperature change laser of monolithic resonant cavity, is realized to the locking of laser frequency;
Step 25, Servocontrol device adopts the quick tracking characteristics of fast ring feedback and the lockout feature of slow ring feedback simultaneously, finally realizes the frequency stabilization of laser in reference frequency.
Beneficial effect of the present invention is:
Iodine molecule saturated absorption of the present invention and the frequency stabilization of optical heterodyne modulation Transfer Spectroscopy are with the obvious advantage with respect to other frequency-stabilizing methods such as the frequency stabilization of Lamb dip double frequency, the frequency stabilization of Zeemen effect double frequency, passive cavity frequency stabilization, the frequency stabilizations of linear absorption frequency modulation spectrum, owing to having eliminated Doppler broadening, the depression that Absorption Line center is formed is very narrow and very stable, in this reference point, make the stability of laser frequency and reproducibility obtain large increase the frequency stabilization of 532nm laser frequency.
The present invention adopts monolithic dual-wavelength solid laser technology and iodine molecule saturated absorption and optical heterodyne modulation Transfer Spectroscopy Frequency Stabilization Technique, by 532nm laser frequency stabilization to the natural reference of iodine molecule transition spectral line, error feedback signal makes monolithic dual-wavelength solid laser obtain frequency stabilization, the 1064nm Frequency Stabilized Lasers single of its output, by after PPKTP frequency-doubling crystal, obtains the green Frequency Stabilized Lasers of stable 532nm.
532nm Frequency Stabilized Lasers of the present invention has the features such as wavelength stability is good, line width, and then realizes the wavelength index calibration to spectrometer S-band.Produce 1064nm, 532nm stabilized lasers that wavelength has strict multiple relation, can calibrate the wavelength linear degree of grating type spectrum.
The present invention has realized the miniaturization of iodine Frequency Stabilized Lasers standard of wavelength device, and stable performance, compact conformation, antijamming capability are strong, and the light path of its frequency stabilization part is of a size of 27 * 12 * 11cm3, and the frequency stability of its 1s is better than 3 * 10
-12, trimestral frequency stability is better than 2 * 10
-10.
Accompanying drawing explanation
Fig. 1 is that 532nm laser standard wave length of the present invention produces overall procedure schematic diagram;
Fig. 2 is the schematic flow sheet that monolithic dual laser of the present invention produces 532nm, 1064nm dual-wavelength laser;
Fig. 3 is iodine molecule saturated absorption of the present invention and optical heterodyne modulation Transfer Spectroscopy frequency stabilization principle schematic;
Fig. 4 is a of iodine molecule R of the present invention (56) 32-0
10the Modulation Transfer Spectroscopy curve of component;
Fig. 5 is the light channel structure figure of miniaturization iodine Frequency Stabilized Lasers device frequency stabilization part of the present invention.
Embodiment
The overall procedure schematic diagram that the green laser standard wave length of 532nm produces is as shown in Figure 1:
The 532nm laser of monolithic dual-wavelength solid laser output incides iodine molecule saturated absorption frequency stabilization system, frequency stabilization system provides the reference frequency of a frequency stabilization, if this reference frequency of the frequency departure of 532nm laser, frequency stabilization system can produce feedback signal, this feedback signal is passed through servo-control system, regulate the chamber of monolithic laser long, make, in reference frequency that 532nm laser frequency stabilization provides in frequency stabilization system, to guarantee stablizing of 532nm laser frequency.Because this 532nm laser is that the 1064nm laser single of being exported by monolithic laserresonator obtains by PPKTP frequency-doubling crystal, so above-mentioned frequency stabilization process has also guaranteed the stable of 1064nm laser frequency simultaneously.The stable 1064nm laser single of monolithic dual-wavelength solid laser output obtains the green Laser output of stable 532nm by PPKTP frequency-doubling crystal.
Monolithic solid state laser is a kind of design very cleverly, and it integrates the fabulous stability of the good unimodular property in unidirectional loop chamber and monolithic chamber and constructs and form.From monolithic solid state laser, after occurring, seem just to set up their relationship with Solid State Laser frequency marking.The live width of this laser or frequency noise are less than tens kilo hertzs, there is not mode hopping cline frequency tuning range of the large span frequency tuning of tens gigahertz (GHZ)s and the single-frequency of (5～10) GHz, its directivity and light beam space characteristics approach diffraction limit, there is the outstanding inhibition ability to audio frequency or mechanical vibration noise, the high-quality single-frequency power output that can produce watt level, particularly it has good open loop frequency and power stability.Adopt after Noise Suppression Technique, its intensity noise level can be reduced to and approach quantum noise limit, is particularly suitable for optical frequency standard and to laser frequency spectrum quality and noise, the time of light beam and the various fields that spatial stability, FREQUENCY CONTROL and tuning range etc. have higher requirements.
Monolithic solid state laser is dual wavelength output, and one of them wavelength is stable single-frequency 1064nm infrared laser, and another wavelength is the 532nm frequency doubled light that above-mentioned single-frequency 1064nm laser single is produced by PPKTP frequency-doubling crystal.The light path system of monolithic solid state laser as shown in Figure 2, the laser of 808nm semiconductor laser diode A, B transmitting incides in sealing monolithic resonant cavity after PBS (polarization coupling prism) closes light, excitation bonding Nd:YAG monolithic crystal, produces 1064nm near-infrared laser.BS1 (beam splitter prism) is to the high transmission of 808nm pump light, to the high reflection of 1064nm laser.1064nm laser through BS2 (beam splitter prism) transmission incides in noise suppression unit, uses electro-optical feedback noise suppression circuit, realizes effective inhibition of laser intensity noise.Through the 1064nm laser of BS2 reflection is done polarization state adjustment through λ/4 wave plate after, pass through condenser lens Lens3 and enter PPKTP frequency-doubling crystal, the light beam after frequency multiplication passes through the spatial distribution shape that collimating lens Lens4 collimates and adjusts light beam.BS3 (beam splitter prism) is to the high transmission of the laser of 1064nm, to the high reflection of 532nm frequency doubled light, it is for spatially separating 532nm frequency doubled light and 1064nm fundamental frequency light, thereby output respectively, wherein 532nm frequency doubled light incides iodine molecule absorption frequency stabilization system, for a to iodine molecule R (56) 32-0 hyperfine structure by 532nm laser frequency lock
10in component frequency, carry out frequency stabilization; Other 1064nm fundamental frequency light incides in PPKTP frequency-doubling crystal, for generation of the 532nm frequency doubled light of high stable output.
The external interference such as variation of ambient temperature, mechanical oscillation is very large on laserfrequencystability impact, thereby the most direct frequency-stabilizing method is exactly constant temperature, shockproof, airtight sound insulation, stabilized power supply etc.Yet due to the extreme sensitivity of laser frequency to environmental impact, even if adopt rigid measures, the laser frequency stability and the reproducibility that freely turn round can not reach 10
-8magnitude.In order further to improve frequency stability and reproducibility, must use electronic servo automatically to control laser, i.e. the method for active frequency stabilization.In the situation that keeping refractive index constant, the essence of Frequency Stabilization Technique is exactly keep resonant cavity optical length stable.Initiatively frequency stabilization need to be chosen a stable reference frequency, when ectocine makes laser frequency depart from specific reference frequency, can differentiate by frequency, by electronic servo, automatically regulate chamber long, laser frequency is returned to specific reference frequency and reaches the object of frequency stabilization.
The basic principle of laser frequency stabilization: by the Frequency Locking of laser in certain extremely stable reference frequency, as the feature transition spectral line of the high stable of atom or molecule or the laser having locked etc.By photodetector, obtain error signal, once frequency shift (FS) reference frequency, this signal can be processed and produced feedback signal by PI (ratio-integration) servo circuit, feedback signal is controlled the electric current of laser and the piezoelectric ceramic on resonant cavity mirror, thus by the frequency stabilization of laser on reference frequency.
The method of the frequency stabilization of laser active at present comprises the frequency stabilization of Lamb dip double frequency, the frequency stabilization of Zeemen effect double frequency, passive cavity frequency stabilization, the frequency stabilization of linear absorption frequency modulation spectrum, saturated absorption Frequency Stabilization of Modulation Transfer Spectroscopy etc.The frequency stabilization of Lamb dip double frequency and the frequency stabilization of Zeemen effect double frequency are all to using the centre frequency of the gain curve of the atomic transition of laser own as with reference to standard frequency, but this centre frequency is vulnerable to the impact of the factors such as discharging condition and line pressure shift, its stability is not high, and live width is also wider, limited the raising of precision frequency stabilization.
The existence of background noise can limit the measurement to Weak Absorption signal greatly, thereby affects the raising of detection sensitivity.The frequency spectrum of background noise, generally in low-frequency range, just can suppress this low frequency background noise so adopt modulator to carry out high frequency modulated to laser frequency.Laser beam after frequency modulation(FM) is by after absorbing material, and the intensity of its Absorption Line is also subject to same frequency modulation, so the methods such as available phase sensitive detection detect.Compare with direct-detection projection light intensity, frequency modulating method at least can improve detection sensitivity approximately 100 times.The frequency stabilization of linear absorption frequency modulation spectrum is to utilize extraneous reference frequency to carry out frequency stabilization, although detection sensitivity has obtained large increase, also improve the stability of laser, still, due to the Doppler broadening effect of absorption line, still limited the further raising of precision frequency stabilization.So, in order to improve frequency stability and the reproducibility of laser, should adopt saturated absorption Frequency Stabilization of Modulation Transfer Spectroscopy technology.
In order further to put forward the key of high-frequency long-time stability and reproducibility, it is stable reference frequency narrow as far as possible with live width of How to choose.The saturated absorption frequency stabilization of iodine exactly meets this requirement, owing to adopting the absorption line of iodine as having improved frequency stability with reference to frequency, and because the air pressure of iodine chamber is very low, the line pressure shift of the collision broadening of Absorption Line and absorbent core frequency is all very little, the most important thing is to produce saturation effect with two laser of restrainting (oppositely) coincidence in the same way, eliminated Doppler broadening, the depression that Absorption Line center is formed is very narrow and very stable.Using this reference point as frequency stabilization, can make the stability of frequency and reproducibility improve a lot.
Optical heterodyne modulation Transfer Spectroscopy technology was when to be exactly a branch of modulated beam of light by optical phase modulator acted on nonlinear dielectric with the light beam of original non-modulated simultaneously, due to nearly degeneration four-wave mixing process, can in the light beam of original non-modulated, produce new sideband, that is to say and the modulation of light beam is transferred to the light beam of original non-modulated from modulated beam of light.When the latter is surveyed by Quick photoelectric detector, will produce optical heterodyne beat signal, the amplitude of this beat signal and reflected mutually the nonlinear interaction of laser beam and medium.Optical heterodyne modulation Transfer Spectroscopy technology can produce the high narrow absworption peak signal of signal to noise ratio, and it is limited by the fundamental disturbances of signal self only.It can provide very symmetrical and pure resonance signal, therefore laser lock-on is absorbed in resonance line to quantum, can reach unprecedented accuracy.
In the frequency stabilization system that adopts saturated absorption optical heterodyne modulation Transfer Spectroscopy Frequency Stabilization Technique to realize, high light (being called saturated light beam) is as pump light, and detecting light beam coaxial with it, parallel, (or oppositely) propagation in the same way is surveyed the saturated absorption signal of iodine.Due to four wave mixing effect, the frequency modulated signal on pump light is transferred to for detection of on the weak detection light of error signal (Modulation Transfer Spectroscopy method).Double balanced mixer carries out mixing the signal detecting and the local oscillation signal through phase shift, can obtain than the narrower absorption of linear absorb spectrum line or dispersion signal, thereby for locking more accurately laser frequency.Due to the method by laser frequency lock on the hyperfine spectral line of the iodine molecule without Doppler broadening, thereby can realize high-precision laser frequency stabilization, frequency stability is better than 10
-14magnitude.
Iodine molecule saturated absorption and optical heterodyne modulation Transfer Spectroscopy frequency stabilization principle process schematic diagram be as shown in Figure 3: 532nm laser is after λ/4 wave plate and lens implementation space polarization state are adjusted, by PBS1, be divided into the orthogonal two-beam in polarization direction, wherein beam of laser (pump light) is modulated laser through electrooptic modulator, another beam of laser (detection light) is modulated, two-beam in the same way (or reverse) enters iodine chamber, by temperature regulating device, keep iodine room temperature stable, in iodine chamber, two-beam produces non-linear four wave mixing, realize sideband transfer to unmodulated light beam by modulated beam of light.Unmodulated light beam and the new sideband producing import photoelectricity differential detector (DET) through PBS3, by double balanced mixer demodulation and with local oscillation signal mixing, obtain error signal.This error signal, through servo control circuit system, is divided into speed loop two parts.Piezoelectric ceramic on fast loop section FEEDBACK CONTROL laser monolithic resonant cavity, thereby long by the chamber of change stress change laser monolithic resonant cavity, the output frequency of adjustment monolithic laser, realizes quick tracking and the locking among a small circle of monolithic laser.Slow loop section feedback, on the temperature-controlling system of monolithic resonant cavity, by changing the resonance frequency of the temperature change laser of monolithic resonant cavity, thereby realizes the large-scale locking of laser frequency.Servo-control system adopts the quick tracking characteristics of fast ring feedback and the lockout feature on a large scale of slow ring feedback simultaneously, and finally realizing is a in iodine molecule R (56) 32-0 hyperfine structure by the frequency stabilization of laser in reference frequency
10in the frequency of component.The a of iodine molecule R (56) 32-0
10the Modulation Transfer Spectroscopy curve of component as shown in Figure 4.
Near 532nm wavelength, iodine molecule exists the strong absorption line that lower energy level is ground state, and the existence of this strong absorption makes likely to reduce iodine chamber cold finger temperature to lower than subzero 10 degrees Celsius, is equivalent to the steam drop of iodine molecule below 1Pa.For the stable of laser frequency and metering, this low pressure means that pressure that Peng Tong introduces widens and the reducing of displacement.Under this low pressure, likely use on the one hand less laser power, and more low power use can reduce power and widens and power displacement; On the other hand, can use longer absorption length or adopt folded optical path, the prolongation of this effective absorption light path can obtain narrower absorption line, improves signal to noise ratio.For optical heterodyne modulation Transfer Spectroscopy technology, reduction along with iodine steam pressure, modulating frequency should be done corresponding reduction, the possibility that this reduction realizes, requirement is in the respective tones spectral limit of laser used, should have extremely low noise, and monolithic solid state ring laser adopts after noise reduction techniques, the intensity noise within the scope of this can approach quantum noise limit.
The laser of 532nm is carried out to frequency stabilization, and conventional is saturated absorption frequency stabilization method, usings the frequency of hyperfine spectral line of I as carrying out frequency stabilization with reference to frequency.The frequency of the absorption line in the hyperfine spectral line of frequency regulator employing iodine gas molecule is as carrying out frequency stabilization with reference to frequency, and the absorption line of selection should have the advantages such as spectral line is pure, intensity is large, a
10component absorption line meets the demands.532nm laser beam is after this frequency regulator, frequency regulator provides stable reference frequency, when laser frequency departs from reference frequency, frequency regulator can produce differential signal, by signal processing technology, produce feedback signal, feedback signal drives the piezoelectric ceramic (PZT) of 532nm laser (actual is 1064nm monolithic laser) to adjust the resonant cavity of laser through servo system, makes the frequency stabilization of laser in reference frequency, thereby keeps the frequency stabilization of laser.In addition, also to adopt temperature regulating device to reduce the temperature fluctuation of 532nm laser and frequency regulator, improve the frequency stability of laser.
By above-mentioned measure, we adopt the about 400kHz of laser linewidth of the miniaturization 532nm Frequency Stabilized Lasers device of iodine molecule saturated absorption and the development of optical heterodyne modulation Transfer Spectroscopy Frequency Stabilization Technique, compare with other frequency-stabilizing method, its frequency stability is better, and the frequency stability of its 1s is better than 3 * 10
-12, trimestral frequency stability is better than 2 * 10
-10.
The present invention utilizes iodine molecule saturated absorption and optical heterodyne modulation Transfer Spectroscopy technology, has realized the output of 532nm standard wave length's laser, and then has realized the calibration to spectrometer S-band wavelength index.Technical problem to be solved by this invention comprises:
1, realize the frequency stabilization of 532nm laser, obtain stable 532nm Laser output.
2, realize the miniaturization of Frequency Stabilized Lasers standard of wavelength device.
The present invention is in conjunction with monolithic dual-wavelength solid laser technology, iodine molecule saturated absorption and optical heterodyne modulation Transfer Spectroscopy Frequency Stabilization Technique, developed the 532nm Frequency Stabilized Lasers device of miniaturization, its light path part is of a size of 27 * 12 * 11cm3, obtained the green Laser output of Wavelength stabilized 532nm, the frequency stability of its 1s is better than 3 * 10
-12, trimestral frequency stability is better than 2 * 10
-10.The light path of miniaturization iodine Frequency Stabilized Lasers device frequency stabilization part is of a size of 27 * 12 * 11cm3, and its structure chart as shown in Figure 5.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (3)
1. a laser frequency stabilization implementation method, is characterized in that, comprising:
Step 1, utilize monolithic dual laser output 532nm laser, described 532nm laser incides iodine saturated absorption frequency stabilization device, wherein, described monolithic dual laser is dual wavelength output, a wavelength is single-frequency 1064nm laser, and another wavelength is the 532nm laser that described single-frequency 1064nm laser single is produced by PPKTP frequency-doubling crystal;
Step 2, utilize described iodine saturated absorption frequency stabilization device to judge processing to described 532nm laser, if the reference frequency of iodine saturated absorption frequency stabilization device described in the frequency departure of 532nm laser, described iodine saturated absorption frequency stabilization device produces feedback signal, and this feedback signal is sent to Servocontrol device, perform step 3; If described 532nm swashs light frequency in described reference frequency, realized laser frequency stabilization, without processing;
Step 3, utilizes described Servocontrol device to regulate the chamber of described monolithic dual laser long according to feedback signal, makes described 532nm swash light frequency in described reference frequency.
2. laser frequency stabilization implementation method as claimed in claim 1, is characterized in that,
Described step 1 comprises:
Step 11 incides the 808nm laser of the semiconductor laser diode transmitting of monolithic dual laser in sealing monolithic resonant cavity after polarization coupling prism closes light, and excitation bonded monoblock crystal produces 1064nm laser;
Step 12, utilizes the first beam splitter prism to 808nm laser-transmitting, and to 1064nm laser reflection, the 808nm laser of transmission, after the second beam splitter prism transmission, is used electro-optical feedback noise suppression circuit, carries out the inhibition of laser intensity noise; The 1064nm laser of reflection is after the second beam splitter prism reflection, use λ/4 wave plate to do polarization state adjustment, then line focus lens enter PPKTP frequency-doubling crystal, produce 532nm laser, and the light beam after frequency multiplication passes through the spatial distribution shape that collimating lens collimates and adjusts light beam;
Step 13, utilizes the laser-transmitting of the 3rd beam splitter prism to 1064nm, to the reflection of 532nm frequency doubled light, 532nm frequency doubled light and 1064nm fundamental frequency light is spatially separated.
3. laser frequency stabilization implementation method as claimed in claim 1, is characterized in that,
Described step 2 comprises:
Step 21,532nm laser after carrying out space polarization state adjustment, λ/4 wave plate and lens is divided into the orthogonal two-beam in polarization direction, wherein beam of laser is that pump light utilizes the electrooptic modulator of described iodine saturated absorption frequency stabilization device to modulate, and another beam of laser is not modulated for surveying light;
Step 22, enters two-beam in the ，Dian chamber, iodine chamber of described iodine saturated absorption frequency stabilization device in the same way or oppositely, and two-beam produces non-linear four wave mixing, realizes sideband transfer to unmodulated light beam by modulated beam of light;
Step 23, imports the sideband of described detection light and generation in photoelectricity differential detector, by double balanced mixer demodulation and with local oscillation signal mixing, obtain error signal, this error signal, through servo control circuit device, is divided into fast loop section and slow loop section;
Step 24, utilize the piezoelectric ceramic on fast loop section FEEDBACK CONTROL laser monolithic resonant cavity, thereby the chamber that changes laser monolithic resonant cavity by change stress is long, adjust the output frequency of monolithic laser, realize quick tracking and the locking among a small circle of monolithic laser, slow loop section feedback, on the temperature-controlling system of monolithic resonant cavity, by changing the resonance frequency of the temperature change laser of monolithic resonant cavity, is realized to the locking of laser frequency;
Step 25, Servocontrol device adopts the quick tracking characteristics of fast ring feedback and the lockout feature of slow ring feedback simultaneously, finally realizes the frequency stabilization of laser in reference frequency.
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