CN103036142B - Laser frequency positive lock device - Google Patents
Laser frequency positive lock device Download PDFInfo
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- CN103036142B CN103036142B CN201210541178.8A CN201210541178A CN103036142B CN 103036142 B CN103036142 B CN 103036142B CN 201210541178 A CN201210541178 A CN 201210541178A CN 103036142 B CN103036142 B CN 103036142B
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Abstract
The invention discloses a kind of laser frequency positive lock device.This device comprises: laser head to be locked, for outgoing continuous print laser; Neutral-density filter, for described laser of decaying to suitable power; Atom pool device, produces without Doppler's saturated fluorescence spectral signal under the exciting of the laser after described decay; Control device, for gathering without Doppler's saturated fluorescence spectral signal, and according to the laser frequency exported without laser head to be locked described in the correction of Doppler's saturated fluorescence spectral signal collected.The present invention adopt atom pond interior atoms to launch without Doppler's saturated fluorescence spectral signal as frequency reference, make laser frequency absolutely accurate reliable.
Description
Technical field
The present invention relates to the technical field of laser frequency stabilization, particularly relate to based on the laser frequency positive lock device without Doppler's saturated fluorescence spectrum.
Background technology
Along with the progress of laser technology and application technology thereof, to the live width of laser frequency and stability requirement more and more higher.In Atmospheric Survey laser radar field, for the detection demand that required precision is not high, lower to the requirement of laser linewidth, commercial laser device standard type product (live width is generally at 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, introduce injection seeded technology, inject the narrower standard seed light of live width to laser resonant cavity, the output linewidth of compressible laser.But injection seeded method can only compress Laser output live width to a certain extent, the requirement steady in a long-term of frequency cannot be met.Promote to know clearly the development of laser frequency stabilization technology thus, in succession occur the lateral edges lock-in techniques and the Pound-Drever-Hall lock-in techniques that utilize reference cavity.The general 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 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 general principle of Pound-Drever-Hall lock-in techniques is by an electro-optical modulation device modulated laser frequency, the laser containing three kinds of frequencies after 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 error model to revise the chamber of laser long, thus reach the object locking laser frequency to a certain extent.
But, utilize lateral edges lock-in techniques and Pound-Drever-Hall lock-in techniques to lock laser frequency according to external reference chamber and still there is certain defect.Owing to being subject to the impact of environmental condition, such as temperature and vibration, and reference cavity device used is lax, in long situation, can drift be there is in the laser frequency of locking.Cannot the frequency of long-time stable laser under the frequency of absolutely accurate.For the system requiring frequency absolutely accurate, this technical difficulty problem need be solved.
Summary of the invention
(1) technical problem that will solve
The present invention, for solving the problem, proposes a kind of device of positive lock laser frequency, solves the long-time absolute stable demand of laser frequency.
(2) technical scheme
For solving the problem, the present invention proposes a kind of laser frequency positive lock device, it comprises: laser head to be locked, for outgoing continuous print laser; Neutral-density filter, for described laser of decaying to suitable power; Atom pool device, produces without Doppler's saturated fluorescence spectral signal under the exciting of the laser after described decay; Control device, for gathering without Doppler's saturated fluorescence spectral signal, and according to the laser frequency exported without laser head to be locked described in the correction of Doppler's saturated fluorescence spectral signal collected.
(3) beneficial effect
Advantage of the present invention and effect are: adopt atom pond interior atoms to launch without Doppler's saturated fluorescence spectral signal as frequency reference, make laser frequency absolutely accurate reliable.And the positive lock precision of laser frequency can be made can to reach MHz magnitude without the Lamb dip feature of Doppler's saturated fluorescence spectrum, precision is very high.The signal-generating device cheap by computer for controlling inside price and sampler, the signal needing waveform can be conveniently exported by program, and control algolithm is by software simulating, without the need to extra hardware signal processor and signal generator, reduce system cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the laser frequency positive lock device that the present invention proposes;
Fig. 2 is the structural representation with the assembly in atom pond in the present invention;
Fig. 3 is the control flow chart that in the present invention, computer for controlling realizes.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, 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, laser frequency positive lock device comprises laser head 1 to be locked, polarization beam splitting crystal 2, neutral-density filter 3, aperture 4,45 ° of speculums 5,6,0 °, atom pond speculum 7, photodetector 8, computer for controlling 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 design is developed voluntarily by software development environment, by the multifunction card of computer for controlling inside, makes it apply the laser frequency of sinusoidal jitter signal jitter laser to be locked.The laser of laser head outgoing separates part light by polarization beam splitting crystal and carrys out excimer subpool, excitation beam and the light beam that returned by speculum 7 are in opposite directions by atom pond, produce without Doppler's saturated fluorescence spectral signal, this signal is by the multifunction card collection of computer for controlling inside.Computer for controlling compares the sinusoidal jitter signal of applying and the how general saturated fluorescence spectral signal of nothing of collection by the control algolithm that programming produces, and is obtained the phase shift information of laser, thus obtain error correction signal by signal multiplication and integral operation.According to this error correction signal, computer for controlling output calibration voltage signal to laser controller 10, thus constantly revises laser Output of laser frequency.
Wherein polarization beam splitting crystal is used for separating weak laser for laser frequency lock, and most of laser is used for other experiments and uses; The light signal strength of neutral-density filter adjustable excimer subpool is to appropriate power; Aperture is consistent with back light light path for adjusting excimer subpool light; 45 ° of speculums are for changing beam direction, and its surface is coated with high-reflecting film, and reflectivity reaches more than 99%; Inside, atom pond is filled with the atom species that can produce wave spectrum to be locked; 0 ° of speculum is for passing back through the laser in atom pond; Photodetector be used for Measurement atom pond export without Doppler's saturated fluorescence spectral signal, be converted into the signal of telecommunication; Computer for controlling is used for settling signal collection, and correction signal produces, and sinusoidal jitter signal occurs and other program control functions.
See Fig. 1, laser head 1 outgoing continuous laser, by polarization beam splitting crystal 2 beam splitting, wherein separates sub-fraction weak laser for laser frequency lock, and most of laser is used for other experiments and uses.This sub-fraction weak laser decays to suitable power by neutral-density filter 3, and this neutral-density filter is arranged on the convenient mirror holder replaced, and can replace the neutral-density filter of proper density at any time as required.Through the laser of neutral-density filter 3 through aperture 4 center, aperture 4 is the adjustable apertures of a pore size.Pass from the window center in atom pond 6 after the laser of small holes 4 is reflected by 45 ° of speculums 5.Atom pond 6 is encapsulated in isoperibol, and as shown in Figure 2, its temperature controls the constant temperature needed by a temperature controller to overall package structure.Laser through atom pond 6 is returned by 0 ° of former road of speculum 7, back light can be made by aperture 4 center by the adjusting mechanism adjusting 0 ° of speculum 7, thus reaches the object of incident light and the coincidence of back light light path.When incident light and back light are through atom pond 6, meeting fluorescence excitation signal, converts fluorescence signal to the signal of telecommunication in the side in atom pond by photodetector 8.The signal of telecommunication is again by the multifunction card collection assigned on controlling calculation 9, and computer for controlling 9 calculates correction voltage signal by the control algolithm worked out voluntarily, exports to laser controller 10.Laser controller 10 is long according to this correction voltage signal adjustment laser head cavity, thus reaches the object of adjustment laser frequency.
Fig. 2 gives atom pond 6 system construction drawing, and left figure is its whole structure figure, right figure is parts disassembly diagrams.In disassembly diagram, 203 is atom pond, and it is the optical element that cylindrical structural is transparent, and both sides are the window with counnter attack plated film, and the sharp assembling structure in cylindrical centre is its sealing joint place, and inside, atom pond envelope has atom species.The outer race in atom pond has heat-conducting metal to overlap 204, can be the material that aluminium matter etc. is easy to heat conduction.More balanced in order to make heat distribute, be pasted with heating element 202 at the two ends of heat-conducting metal cover, this heating element should adopt the good heating plate of pliability, and power density and length are selected as required.Temperature sensor is placed on correct position in the middle of heat transfer jacket.Overlapping periphery at heating element and heat-conducting metal is incubation chamber 201, its objective is to prevent heat to run off fast, being easy to make atom pond temperature constant at specified temp.At the sealing joint place in atom pond, be designed with heat conducting element (or heat conducting bar), thus make sealing joint place temperature minimum, make unnecessary atom all be cooled to sealing joint place, and prevent atoms condense at two side windows in atom pond, cause window light transmittance to reduce.
Said photodetector 8 generally adopts fast photodiode or photomultiplier, and photomultiplier transit tube elements can obtain larger enlargement ratio, recommends to adopt.Its current signal exported can convert output voltage to by voltage follower circuit, and makes its impedance and assign into the impedance matching of the multifunction card acquisition function part on computer for controlling 9.Said multifunction card mainly has three zones: multichannel collecting, and multichannel analog exports and digital IO.Required signal can be gathered by multichannel collecting function.The analog signal of required waveform can be exported by multichannel analog output function.Can be used for communicating with other equipment by digital IO function, complete required controlling functions.
Said control software design is write based on Labview development environment G language, and its graphic programming feature is easy to and user interactions, and its integrated a lot of interface function and algorithmic function are the development saving plenty of time.The main following module of this control software design, basic procedure as shown in Figure 3: initialization module, parameter setting module, manual scanning control module, automatic scan control module and locking tracking module.Initialization module mainly complete controling parameters as the initialization of starting voltage, acquisition parameter and interface parameter etc. and control display, figure display data initialization function.Parameter setting module is used for amendment and arranges associated control parameters, such as signal output voltage scope, arranging of signal sampling rate.Under initial situation, manual scanning control module completes the scanning of atom pond spectrum by artificial button, and manually selects laser frequency lock point.Automatic scan control module is by program in the sweep limits that the interface parameter of setting specifies, each stepping output voltage signal to laser controller, thus completes spectral scan function voluntarily, and automatically searches laser frequency lock point according to the maximum algorithm of signal.Locking tracking module completes described sinusoidal jitter voltage and exports, synchronous acquisition atom pond is without how general saturated fluorescence spectral signal, and compare the sinusoidal jitter signal of applying and the how general saturated fluorescence spectral signal of nothing of collection, the phase shift information of laser frequency is obtained by signal multiplication and integral operation, calculate error correction signal thus, if the error calculated outside the error range of setting, then obtains required correction voltage signal according to this error correction signal by pid control algorithm and exports to laser controller.Laser controller according to this correction voltage signal adjustment laser head, thus revises laser Output of laser frequency.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a laser frequency positive lock device, it comprises:
Laser head to be locked, for outgoing continuous print laser;
Neutral-density filter, for described laser of decaying to suitable power;
Atom pool device, produces without Doppler's saturated fluorescence spectral signal under the exciting of the laser after described decay; Described atom pool device enclosed inside has atom species; Described atom pool device is a cylindrical structural, and its two ends are the window with plated film, and the middle position of cylindrical structural has the sealing joint of pointed structures; The outer race of described atom pool device has heat-conducting metal cover, and heat-conducting metal cover two ends are pasted with heating element, is incubation chamber, makes described atom pool device be in temperature constant state at described heat-conducting metal cover and described heating element periphery; Wherein said laser is walked from described window; The sealing joint place of described atom pool device is provided with heat conducting element, and this heat conducting element makes the temperature at sealing joint place minimum, and then makes unnecessary atom all be cooled to sealing joint place, prevents atoms condense at the window place at two ends, atom pond;
Control device, for gathering without Doppler's saturated fluorescence spectral signal, and according to the laser frequency exported without laser head to be locked described in the correction of Doppler's saturated fluorescence spectral signal collected; Wherein, described control device is also for applying sinusoidal jitter signal to described laser head to be locked; 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 that described laser head to be locked exports; Described control device exports sinusoidal jitter signal to after described laser head to be locked, gather without how general saturated fluorescence spectral signal, and compare applied sinusoidal jitter signal and the how general saturated fluorescence spectral signal of nothing gathered, the phase shifts signal of laser frequency is obtained 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, thus revise the laser frequency of described laser head output to be locked.
2. device as claimed in claim 1, it is characterized in that, described device also comprises polarization mark crystal, and it for the laser beam splitter by described laser head outgoing to be locked, and then obtains the weak laser for laser frequency lock.
3. device as claimed in claim 1, it is characterized in that, described device also comprises speculum, and the laser through described atom pool device returns through described speculum reflection Hou Yuan road, incident light and reverberation light path are overlapped, thus produces without Doppler's saturated fluorescence spectral signal.
4. device as claimed in claim 1, it is characterized in that, described device also comprises photodetector, and it is described without Doppler's saturated fluorescence spectral signal for detecting, and is converted into the signal of telecommunication; Described control device also comprises multifunction card, and wherein said multifunction card is 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.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109066283B (en) * | 2018-09-26 | 2020-08-25 | 中国科学技术大学 | Method, device and system for locking laser frequency |
| 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 |
| 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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| CN102183234A (en) * | 2011-03-21 | 2011-09-14 | 清华大学 | Method and device for measuring frequency scanning absolute distance based on femtosecond optical frequency comb |
| CN102213619A (en) * | 2011-05-20 | 2011-10-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser frequency measuring device and method |
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| JPH05102581A (en) * | 1991-03-27 | 1993-04-23 | Yokogawa Electric Corp | Timing stabilizer |
| US7061944B2 (en) * | 2001-05-25 | 2006-06-13 | International Business Machines Corporation | Apparatus and method for wavelength-locked loops for systems and applications employing electromagnetic signals |
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|---|---|---|---|---|
| CN102183234A (en) * | 2011-03-21 | 2011-09-14 | 清华大学 | Method and device for measuring frequency scanning absolute distance based on femtosecond optical frequency comb |
| CN102213619A (en) * | 2011-05-20 | 2011-10-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser frequency measuring device and method |
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