CN103036142A - Laser frequency absolute locking device - Google Patents
Laser frequency absolute locking device Download PDFInfo
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- CN103036142A CN103036142A CN2012105411788A CN201210541178A CN103036142A CN 103036142 A CN103036142 A CN 103036142A CN 2012105411788 A CN2012105411788 A CN 2012105411788A CN 201210541178 A CN201210541178 A CN 201210541178A CN 103036142 A CN103036142 A CN 103036142A
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Abstract
The invention discloses a laser frequency absolute locking device which comprises a laser head to be locked, a neutral filter, an atomic pool device and a control device, wherein the laser head to be locked is used for emitting continuous laser, the neutral filter is used for weakening the laser to an appropriate power, the atomic pool device is stimulated by the weakened laser to generate a doppler-free saturated fluorescence spectral signal, and the control device is used for collecting the doppler-free saturated fluorescence spectral signal and revising the laser frequency output by the laser head to be locked according to the collected the doppler-free saturated fluorescence spectral signal. The laser frequency is enabled to be absolutely accurate and reliable by adopting the Doppler-free saturated fluorescence spectral signal emitted by atom inside the atomic pool device as a frequency standard.
Description
Technical field
The present invention relates to the technical field of laser frequency stabilization, relate in particular to based on the absolute locking device of laser frequency without Doppler's saturated fluorescence spectrum.
Background technology
Along with the progress of laser technology and application technology thereof, more and more higher to live width and the stability requirement thereof of laser frequency.In Atmospheric Survey laser radar field, lower to the requirement of laser linewidth for the not high detection demand of required precision, commercially available laser standard type product (live width is generally about 30GHz) can be satisfied the demand.And for the higher detection demand of required precision, live width need reach hundred megahertz requirements, for this reason, introduces the seed injection technique, injects the narrower standard seed light of live width, the output linewidth of compressible laser to laser resonant cavity.Yet the seed method for implanting can only compress the Laser output live width to a certain extent, can't satisfy the requirement steady in a long-term of frequency.Lateral edges lock-in techniques and the Pound-Drever-Hall lock-in techniques of reference cavity have appearred utilizing in promote thus the to know clearly development of laser frequency stabilization technology in succession.The basic principle of lateral edges lock-in techniques is by an external reference chamber, detect reference cavity transmission signal spectrum, keyed end is arranged on the halfwidth degree point place of transmission signal spectrum one side, when laser frequency changes, reference cavity flashlight spectral intensity will depart from keyed end, obtain error correction signal, control laser cavity by executive component long, laser frequency is brought back to the keyed end of setting.The basic principle of Pound-Drever-Hall lock-in techniques is by an electro-optical modulation device modulated laser frequency, the laser that contains three kinds of frequencies after the modulation enters an external reference chamber, the laser that reference cavity returns and the mixing of loading electrooptic modulator modulation signal obtain error signal, control system thus the error model to revise the chamber of laser long, thereby reach the purpose that locks to a certain extent laser frequency.
Yet, utilize lateral edges lock-in techniques and Pound-Drever-Hall lock-in techniques to lock laser frequency according to the external reference chamber and still have certain defect.Owing to being subject to the impact of environmental condition, for example temperature and vibration, and the used device of reference cavity is lax, can there be drift in the laser frequency of locking in long situation.The frequency of stable laser is under the frequency of absolutely accurate for a long time.For the system that requires the frequency absolutely accurate, need to solve this technical difficulty problem.
Summary of the invention
The technical problem that (one) will solve
The present invention has proposed a kind of device of absolute locking laser frequency for addressing the above problem, and has solved the long-time absolute stable demand of laser frequency.
(2) technical scheme
For addressing the above problem, the present invention proposes the absolute locking device of a kind of laser frequency, it comprises: laser head to be locked is used for the continuous laser of outgoing; Neutral-density filter, the described laser that is used for decaying is to suitable power; The atom pool device, generation is without Doppler's saturated fluorescence spectral signal under the exciting of the laser after the described decay; Control device is used for gathering without Doppler's saturated fluorescence spectral signal, and according to the laser frequency without the described laser head output to be locked of Doppler's saturated fluorescence spectral signal correction that collects.
(3) beneficial effect
Advantage of the present invention and effect are: adopt the inner atomic emissions of former subpool without Doppler's saturated fluorescence spectral signal as frequency reference, so that the laser frequency absolutely accurate is reliable.And the Lamb dip feature without Doppler's saturated fluorescence spectrum can be so that the absolute locking precision of laser frequency can reach the MHz magnitude, and precision is very high.By cheap signal generator spare and the sampler of control computer-internal, can conveniently export the signal that needs waveform by program, and control algolithm can realize by software, need not extra hardware signal processor and signal generator, has reduced system cost.
Description of drawings
Fig. 1 is the structural representation of the absolute locking device of laser frequency that proposes of the present invention;
Fig. 2 is with the structural representation of the assembly of former subpool among the present invention;
Fig. 3 is the computer implemented control flow chart of control among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, the absolute locking device of laser frequency comprises laser head 1 to be locked, polarization beam splitting crystal 2, neutral- density filter 3,4,45 ° of speculums 5 of aperture, 6,0 ° of speculums 7 of former subpool, photodetector 8, control computer 9, laser controller 10 to be locked and reference cavity parts thereof.This device utilize atom without Doppler's saturated fluorescence spectrum as frequency absolute reference benchmark.Control software is developed voluntarily by software development environment, and the multifunction card by the control computer-internal makes it apply the laser frequency of sinusoidal jitter signal jitter laser to be locked.The laser head emitting laser is told part light by the polarization beam splitting crystal and is come the excimer subpool, excitation beam and the light beam that returned by speculum 7 are in opposite directions by former subpool, generation is without Doppler's saturated fluorescence spectral signal, and this signal is by the multifunction card collection of control computer-internal.The sinusoidal jitter signal that the control algolithm that the control computer produces by programming relatively applies and the how general saturated fluorescence spectral signal of nothing of collection obtain the phase shifts information of laser by signal multiplication and integral operation, thereby obtain error correction signal.According to this error correction signal, control computer export correction voltage signal to laser controller 10, thereby constantly revise laser Output of laser frequency.
Wherein the polarization beam splitting crystal is used for telling weak laser and is used for laser frequency lock, and most of laser is used for other experiments to be used; The light signal strength of neutral-density filter capable of regulating excimer subpool is to appropriate power; It is consistent with the back light light path that aperture is used for adjusting excimer subpool light; 45 ° of speculums are used for changing beam direction, and its surface is coated with high-reflecting film, and reflectivity reaches more than 99%; Former subpool inside is filled with the atom species that can produce wave spectrum to be locked; 0 ° of speculum is used for returning the laser that passes former subpool; Photodetector be used for the output of Measurement atom pond without Doppler's saturated fluorescence spectral signal, be converted into the signal of telecommunication; The control computer is used for the settling signal collection, and correction signal produces, and the sinusoidal jitter signal occurs and other program control functions.
Referring to Fig. 1, laser head 1 outgoing continuous laser is wherein told the sub-fraction weak laser and is used for laser frequency lock by the beam splitting of polarization beam splitting crystal 2, and most of laser is used for other experiments to be used.This sub-fraction weak laser decays to suitable power by neutral-density filter 3, and this neutral-density filter is installed on the convenient mirror holder of replacing, and can replace as required at any time the neutral-density filter of proper density.Laser through neutral-density filter 3 passes aperture 4 centers, and aperture 4 is the adjustable apertures of a pore size.After being reflected by 45 ° of speculums 5, passes from the window center of former subpool 6 laser of small holes 4.Former subpool 6 is encapsulated in the isoperibol, the overall package structure as shown in Figure 2, its temperature is by the constant temperature at needs of temperature controller control.The laser that passes former subpool 6 is returned by 0 ° of speculum, 7 former roads, can make back light pass through aperture 4 centers by the adjusting mechanism of adjusting 0 ° of speculum 7, thereby reaches the purpose of incident light and the coincidence of back light light path.When incident light and back light pass former subpool 6, can the fluorescence excitation signal, convert fluorescence signal to the signal of telecommunication in a side of former subpool by photodetector 8.The signal of telecommunication is again by the multifunction card collection that assigns in the control calculating 9, and control computer 9 calculates the correction voltage signal by the control algolithm of voluntarily establishment, exports to laser controller 10.It is long that laser controller 10 is adjusted the laser head cavity according to this correction voltage signal, thereby reach the purpose of adjusting laser frequency.
Fig. 2 has provided former subpool 6 system construction drawings, and left figure is its whole structure figure, and right figure is the parts disassembly diagrams.203 is former subpool in the disassembly diagram, and it is the transparent optical element of cylindrical structural, and both sides are the window with the counnter attack plated film, and the sharp assembling structure in cylindrical centre is its sealing joint place, and the inner envelope of former subpool has atom species.The outer race of former subpool has heat-conducting metal cover 204, can be the material that aluminium matter etc. is easy to heat conduction.More balanced for heat is distributed, be pasted with heating element 202 at the two ends of heat-conducting metal cover, this heating element should adopt preferably heating plate of pliability, and power density and length are selected as required.Temperature sensor is placed on the middle correct position of heat transfer jacket.Be incubation chamber 201 in heating element and heat-conducting metal cover periphery, its objective is in order to prevent that heat runs off fast, be easy to make former subpool temperature constant at specified temp.At the sealing joint place of former subpool, be designed with heat conducting element (or heat conducting bar), thereby make sealing joint place temperature minimum, make unnecessary atom all be cooled to the sealing joint place, and prevent that atom from condensing in two side windows of former subpool, cause the window light transmittance to reduce.
Said photodetector 8 general fast photodiode or the photomultipliers of adopting, the photomultiplier transit tube elements can obtain larger enlargement ratio, recommend adoption.The current signal of its output can convert output voltage to by voltage follower circuit, and makes its impedance and assign into the multifunction card acquisition function impedance matching partly of controlling on the computer 9.Said multifunction card mainly has three large functions: multichannel collecting, multichannel analog output and digital IO.Can gather needed signal by the multichannel collecting function.Can export the analog signal of required waveform by the multichannel analog output function.Can be used for communicating with other equipment by the digital IO function, finish needed control function.
Said control software is based on Labview development environment G language compilation, and its graphic programming characteristics are easy to and user interactions, and its integrated a lot of interface functions and algorithmic function are that the plenty of time is saved in development.This control software main following module, basic procedure be as shown in Figure 3: initialization module, parameter arranges module, manual scanning control module, automatic scan control module and locking tracking module.Initialization module is mainly finished the initialization of control parameter such as starting voltage, acquisition parameter and interface parameter etc. and the data initialization function that control shows, figure shows.Parameter arranges module and be used for to revise the relevant control parameter is set, signal output voltage scope for example, the arranging etc. of signal sampling rate.Under initial situation, the manual scanning control module is finished the scanning of former subpool spectrum by artificial button, and manually selects the laser frequency lock point.In the sweep limits of the interface parameter regulation of setting, each stepping output voltage signal is to laser controller by program for the automatic scan control module, thereby finishes voluntarily the spectral scan function, and automatically searches the laser frequency lock point according to the maximum algorithm of signal.The locking tracking module is finished described sinusoidal jitter Voltage-output, the former subpool of synchronous acquisition is without how general saturated fluorescence spectral signal, and the how general saturated fluorescence spectral signal of the nothing of the sinusoidal jitter signal that relatively applies and collection, thereby obtain the phase shifts information of laser frequency by signal multiplication and integral operation, calculate thus error correction signal, if the error of calculating then obtains required correction voltage signal according to this error correction signal by pid control algorithm and exports to laser controller outside the error range of setting.Laser controller is adjusted laser head according to this correction voltage signal, thereby revises laser Output of laser frequency.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. absolute locking device of laser frequency, it comprises:
Laser head to be locked is used for the continuous laser of outgoing;
Neutral-density filter, the described laser that is used for decaying is to suitable power;
The atom pool device, generation is without Doppler's saturated fluorescence spectral signal under the exciting of the laser after the described decay;
Control device is used for gathering without Doppler's saturated fluorescence spectral signal, and according to the laser frequency without the described laser head output to be locked of Doppler's saturated fluorescence spectral signal correction that collects.
2. device as claimed in claim 1 is characterized in that, described control device also is used for applying the sinusoidal jitter signal to described laser head to be locked.
3. device as claimed in claim 2, it is characterized in that, described control device according to described without Doppler's saturated fluorescence spectral signal and described sinusoidal jitter calculated signals error correction signal, and calculate output calibration voltage to described laser head to be locked according to described error correction signal, to revise the laser frequency of described laser head output to be locked.
4. device as claimed in claim 1 is characterized in that, described device also comprises polarization mark crystal, and it is used for the beam splitting of described laser head emitting laser to be locked, and then obtains the weak laser for laser frequency lock.
5. device as claimed in claim 1, it is characterized in that, described device also comprises speculum, passes laser former road after described mirror reflects of described atom pool device and returns, so that described incident light and the coincidence of reverberation light path, thereby produce without Doppler's saturated fluorescence spectral signal.
6. device as claimed in claim 3 is characterized in that, described device also comprises photodetector, and it is used for surveying described without Doppler's saturated fluorescence spectral signal, and is converted into the signal of telecommunication; Described control device also comprises multifunction card, and wherein said multifunction card is used for gathering the described signal of telecommunication; Described control device obtains the phase shifts signal of laser according to the described signal of telecommunication and described sinusoidal jitter calculated signals, and then obtains described error correction signal.
7. device as claimed in claim 1 is characterized in that, described atom pool device inside is packaged with atom species.
8. device as claimed in claim 7 is characterized in that, described atom pool device is a cylindrical structural, and its two ends are the window with plated film, the sealing joint that the place, centre position of cylindrical structural has pointed structure; The outer race of described atom pool device has the heat-conducting metal cover, and heat-conducting metal cover two ends are pasted with heating element, is incubation chamber at described heat-conducting metal cover and described heating element periphery, so that described atom pool device is in temperature constant state; Wherein said laser is walked from described window.
9. device as claimed in claim 8, it is characterized in that, the sealing joint place of described atom pool device is provided with heat conducting element, and this heat conducting element is so that the temperature at sealing joint place is minimum, and then make unnecessary atom all be cooled to the sealing joint place, prevent that atom from condensing in the window place at former subpool two ends.
10. device as claimed in claim 1, it is characterized in that, described control device output sinusoidal jitter signal is given after the described laser head to be locked, gather without how general saturated fluorescence spectral signal, and the sinusoidal jitter signal that relatively applies and the how general saturated fluorescence spectral signal of nothing that gathers, obtain the phase shifts signal of laser frequency by signal multiplication and integral operation, and then by described phase shifts calculated signals error correction signal, and give described laser head to be locked according to described error correction signal calculation correction voltage signal, thereby revise the laser frequency of described laser head output to be locked.
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| CN201210541178.8A CN103036142B (en) | 2012-12-14 | 2012-12-14 | Laser frequency positive lock device |
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| CN201210541178.8A CN103036142B (en) | 2012-12-14 | 2012-12-14 | Laser frequency positive lock device |
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| CN103036142B CN103036142B (en) | 2015-09-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103499814A (en) * | 2013-09-30 | 2014-01-08 | 中国科学技术大学 | High-precision Doppler laser radar frequency locking system |
| CN109066283A (en) * | 2018-09-26 | 2018-12-21 | 中国科学技术大学 | A kind of method, apparatus and system of laser frequency locking |
| JP2020198340A (en) * | 2019-05-31 | 2020-12-10 | 国立研究開発法人産業技術総合研究所 | Automatic optical frequency/phase stabilizer |
| CN117214918A (en) * | 2023-11-09 | 2023-12-12 | 中国科学技术大学 | Rayleigh Doppler temperature measurement wind measurement laser radar |
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Patent Citations (4)
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| JPH05102581A (en) * | 1991-03-27 | 1993-04-23 | Yokogawa Electric Corp | Timing stabilizer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499814A (en) * | 2013-09-30 | 2014-01-08 | 中国科学技术大学 | High-precision Doppler laser radar frequency locking system |
| CN103499814B (en) * | 2013-09-30 | 2016-01-20 | 中国科学技术大学 | A kind of high precision Doppler lidar Frequency Locking system |
| CN109066283A (en) * | 2018-09-26 | 2018-12-21 | 中国科学技术大学 | A kind of method, apparatus and system of laser frequency locking |
| CN109066283B (en) * | 2018-09-26 | 2020-08-25 | 中国科学技术大学 | Method, device and system for locking laser frequency |
| JP2020198340A (en) * | 2019-05-31 | 2020-12-10 | 国立研究開発法人産業技術総合研究所 | Automatic optical frequency/phase stabilizer |
| JP7304061B2 (en) | 2019-05-31 | 2023-07-06 | 国立研究開発法人産業技術総合研究所 | Optical frequency/phase automatic stabilizer |
| CN117214918A (en) * | 2023-11-09 | 2023-12-12 | 中国科学技术大学 | Rayleigh Doppler temperature measurement wind measurement laser radar |
| CN117214918B (en) * | 2023-11-09 | 2024-03-29 | 中国科学技术大学 | Rayleigh Doppler temperature measurement wind measurement laser radar |
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