CN103151696B - The antihunt means of laser frequency and power and stabilizing arrangement - Google Patents
The antihunt means of laser frequency and power and stabilizing arrangement Download PDFInfo
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- CN103151696B CN103151696B CN201310054366.2A CN201310054366A CN103151696B CN 103151696 B CN103151696 B CN 103151696B CN 201310054366 A CN201310054366 A CN 201310054366A CN 103151696 B CN103151696 B CN 103151696B
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Abstract
The invention discloses antihunt means and the stabilizing arrangement of a kind of laser frequency and power, the method comprises: obtain first-order diffraction light; By first-order diffraction light incident light electric explorer; The intensity of detection first-order diffraction light; The signal detected is processed; Signal after process is delivered to drive source; Drive source output signal acts on acousto-optic modulator.This device comprises laser, acousto-optic modulator, electrooptic modulator, polarization splitting prism, λ/4 wave plate, Fabry-Bo Luo Gan interferometer.The present invention improves precision and the stability of reference greatly, realizes higher power stabilization, and improves our frequency stabilization effect.
Description
Technical field
The present invention relates to the stable field of laser frequency and power, refer to antihunt means and the stabilizing arrangement of a kind of laser frequency and power particularly.
Background technology
The relative frequency accuracy of frequency marking and stability are all inversely proportional to nominal frequency f, frequency of light wave exceeds 4-5 magnitude than microwave frequency, if the live width Δ f of the reference spectral line of its correspondence is identical with the traditional frequency marking (rubidium, hydrogen, caesium clock) being operated in microwave band, so for the Q(=f/ Δ f of frequency stabilization spectral line) value be then Microwave Frequency target several ten thousand-hundreds of thousands doubly, namely foretell that stability and the accuracy of optical frequency standard go out 4-5 magnitude than Microwave Frequency absolute altitude theoretically, this is current optical frequency standard development reason very rapidly.Meanwhile, along with the development of super-narrow line width laser technology and femtosecond laser frequency comb technology, optical frequency standard achieves swift and violent development, Al best in the world at present
+the precision of optical frequency standard reaches 10
-18, than current Microwave Frequency absolute altitude 2 magnitudes.High-precision optical frequency standard is for the measurement of physics constant, and inspection and the more high-precision navigation system of development of basic physical law have very large meaning.In order to realize optical frequency standard, the laser of narrow linewidth is absolutely necessary, and its core is exactly adopt sideband modulation frequency-stabilizing method that clock transition is detected the Frequency Locking of light on the optical resonator of a high stability, by photodetector detection resonant cavity reflected light signal, be translated into the signal of telecommunication, utilize after low-pass filter circuit and amplifying circuit process signal, send into feedback actuator as error signal thus realize the locking of laser frequency.In the method, the stability of the laser power before entering chamber is extremely important, the change that the impact due to laser power can cause the chamber of optical resonator long, changes the resonance frequency in chamber, thus causes the frequency after laser lock-on to chamber.Therefore, laser power stability has vital impact for the effect of frequency stabilization, therefore needs to carry out power stability to laser before laser enters chamber.
Traditional laser frequency and power stability device as shown in Figure 1, wherein bold portion be light path,
Dotted portion is circuit, Laser-laser, AOM1-first sound-optic modulator, AOM2-second sound-optic modulator, EOM-electrooptic modulator, BS-beam splitting chip, PBS-polarization splitting prism, PD1-first photodetector, PD2-second photodetector, λ/4-λ/4 wave plate.
The antihunt means of conventional laser frequency are the locking of Fabry-Bo Luo optical resonator realization to laser frequency utilizing a high-fineness.The reflected signal of optical resonator is obtained by polarization splitting prism PBS, mixing is carried out with the signal that the second photoelectric detector PD 2 receives afterwards and second drive source of electrooptic modulator EOM sends, the deviation correcting signal obtaining frequency through low pass filter feeds back to the frequency modulation port of first drive source of first sound-optic modulator AOM1 and the piezoelectric ceramic of laser Laser itself, respectively to narrow live width and the long term drift of laser Laser as fast ring and slow ring.
The antihunt means of conventional laser power, being realized by the driving power of the 3rd drive source of second sound-optic modulator AOM2, is specifically exactly the change utilizing the change of the one-level light diffraction efficiency of second sound-optic modulator AOM2 thus realize 0 grade of luminous power.And the size of second sound-optic modulator AOM2 one-level light diffraction efficiency is relevant with the amplitude size of the 3rd drive source added by second sound-optic modulator AOM2.For 0 grade of light by second sound-optic modulator AOM2, a part of light is allowed to enter the first photoelectric detector PD 1 by beam splitting chip BS, then the voltage signal the first photoelectric detector PD 1 produced sends into power stabilization circuit and an analog voltage reference compares, deviation correcting signal is obtained through differential amplification and proportional integral circuit, deviation correcting signal is sent into the pressure regulation port of the 3rd drive source of second sound-optic modulator AOM2, because the amplitude of the 3rd drive source is modulated, therefore according to the general principle of acousto-optic modulator, the diffraction efficiency of second sound-optic modulator AOM2 first-order diffraction light will change, thus the power of zero order light also can change, finally due to the continuous feedback of power stabilization circuit thus the power stability realizing 0 grade of light in a reference value, realize the stable of laser power thus.In this power stability method, do not utilize the one-level light of second sound-optic modulator AOM2, reason is that the output frequency of the 3rd drive source itself may be just stable not, thus affects further frequency stabilization.
But this traditional antihunt means, usually two acousto-optic modulators will be used to realize the stable of laser power and frequency respectively, add the complexity of light path and circuit, simultaneously, analog voltage reference in power stabilization circuit may be stable not enough, also find that its power stabilization is also not enough to reach our requirement through experiment, laser also can cause the waste of a part of luminous power simultaneously by two acousto-optic modulators.
Summary of the invention
Object of the present invention is exactly antihunt means and the stabilizing arrangement that will provide a kind of laser frequency and power, adopts the method and device that an acousto-optic modulator can be utilized to realize the Dual Stabilization of laser frequency and power simultaneously.
For achieving the above object, the antihunt means of laser frequency provided by the present invention and power, comprise the following steps:
1) the first-order diffraction light of laser by acousto-optic modulator is obtained;
2) by the first-order diffraction light incident light electric explorer by acousto-optic modulator;
3) by the intensity of photodetector detection first-order diffraction light;
4) signal that photodetector detects is processed;
5) signal after process is delivered to drive source;
6) drive source output signal acts on acousto-optic modulator, thus realizes the stable of laser frequency and power.
The stabilizing arrangement of laser frequency provided by the present invention and power, comprise laser, acousto-optic modulator, electrooptic modulator, polarization splitting prism, λ/4 wave plate, Fabry-Bo Luo Gan interferometer according to sequentially passing through laser optical path connection, polarization splitting prism is also connected with the second photodetector by laser optical path; Acousto-optic modulator and electrooptic modulator are connected to the first drive source and the second drive source by cable, and the second drive source is connected with frequency mixer by cable with the second photodetector, and frequency mixer is connected with the first drive source by low pass filter.
Further, described laser frequency and power stability device also comprise hydrogen clock, beam splitting chip, first photodetector, analog to digital converter, comparator, hexadecimal numbers reference voltage source and pass through digital to analog converter, beam splitting chip is arranged between acousto-optic modulator and electrooptic modulator by laser optical path, beam splitting chip is also connected with the first photodetector by laser optical path, first photodetector is complied with by cable and is connected with analog to digital converter and comparator in turn, the input of comparator is connected with hexadecimal numbers reference voltage source by cable, the output of comparator is connected with the first drive source by digital to analog converter, first drive source external input terminals is connected with hydrogen clock by cable.
Compared with prior art, the invention has the advantages that: the present invention is based on hydrogen clock and digital voltage reference, only employ an acousto-optic modulator and achieve the stable of laser power and frequency simultaneously, so just greatly reduce the complexity of system light path and circuit, improve the reliability and stability of system.And decrease the loss of the laser power caused due to acousto-optic modulator diffraction effect, a part of luminous power of saving can be used for other experiment.We adopt digital voltage benchmark for referencial use, just greatly can improve precision and the stability of reference like this relative to analog circuit, realize higher power stabilization, and improve our frequency stabilization effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional laser frequency and power stability device.
Fig. 2 is the structural representation of laser frequency provided by the present invention and power stability device.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of laser frequency shown in Fig. 2 and power stability device, comprise laser 1, acousto-optic modulator 2, beam splitting chip 3, electrooptic modulator 4, polarization splitting prism 5, λ/4 wave plate 6, Fabry-Bo Luo Gan interferometer 7 according to sequentially passing through laser optical path connection, beam splitting chip 3 and polarization splitting prism 5 are also connected with the first photodetector 8 and the second photodetector 9 respectively by laser optical path, acousto-optic modulator 2 and electrooptic modulator 4 are connected to the first drive source 10 and the second drive source 11 by cable, first drive source 10 external input terminals is connected with hydrogen clock 12 by cable, first photodetector 8 is complied with by cable and is connected with analog to digital converter 13 and comparator 14 in turn, second drive source 11 is connected with frequency mixer 15 by cable with the second photodetector 9, frequency mixer 15 is connected with the frequency modulation port of the first drive source 10 by low pass filter 16, the input of comparator 14 is connected with hexadecimal numbers reference voltage source 17 by cable, the output of comparator 14 is connected with the pressure regulation port of the first drive source 10 by digital to analog converter 18.First drive source 10 and the second drive source 11 are signal generator, and the sinusoidal wave frequency that the first drive source 10 exports can reach 300MHz, and power output can reach 2W; The sinusoidal wave frequency that second drive source 11 exports can reach 20MHz, and output amplitude can reach 100V.
The antihunt means of laser frequency comprise the following steps:
1) the first-order diffraction light of laser by acousto-optic modulator 2 is obtained;
2) the first-order diffraction light obtained is passed through electrooptic modulator 4, laser is made to produce two frequency band, namely three frequency contents are contained by the laser of electrooptic modulator 4, carrier angular frequency, radio-frequency component angular frequency+Ω and low-frequency component angular frequency-Ω, wherein Ω is the angular frequency size that the second drive source 11 outputs signal;
3) light by electrooptic modulator 4 is injected Fabry-Bo Luo Gan interferometer 7 after polarization splitting prism 5 and λ/4 wave plate 6;
4) the reflective light intensity signal of Fabry-Bo Luo Gan interferometer 7 is entered as frequency error signal with the second photodetector 9 exploring laser light;
5) frequency error signal detected by the second photodetector 9 and the frequency oscillator signal frequency mixer 15 of the second drive source 11 carry out mixing;
6) signal exported by frequency mixer 15 obtains the deviation correcting signal of frequency through low pass filter 16;
7) deviation correcting signal of frequency be divided into frequency band to be that the frequency deviation correction signal of 1kHz to 1MHz and the frequency deviation correction signal of below 1kHz feed back to acousto-optic modulator 2 and laser 1 as fast ring and slow ring respectively by cable, thus realize laser frequency lock in Fabry-Bo Luo Gan interferometer 7.
The antihunt means of laser power comprise the following steps:
1) hydrogen clock 12 produces standard 10MHz frequency signal, the standard 10MHz frequency signal of generation is input to the foreign frequency reference input of the first drive source 10 by cable;
2) the first-order diffraction light of laser by acousto-optic modulator 2 is obtained;
3) the first-order diffraction light of acquisition is separated a part by beam splitting chip 3 to inject the first photodetector 8 and be used for stabilized lasers power;
4) voltage signal that the first photodetector 8 detects is input to analog to digital converter 13 by cable, analog to digital converter 13 is converted into digital signal, and hexadecimal numbers reference voltage source 17 sends hexadecimal numbers reference voltage;
5) digital signal exported from analog to digital converter 13 and hexadecimal numbers reference voltage are together sent into comparator 14 to compare, thus obtain the voltage deviation correcting signal of laser power;
6) the voltage deviation correcting signal obtained is sent into digital to analog converter 18, digital to analog converter 18 is translated into analog signal;
7) analog signal of conversion is input to the outside pressure regulation port of the first drive source 10 by digital to analog converter 18 through cable, thus changes the output signal voltage size of the first drive source 10;
8) voltage signal produced in step 6 and step 7 is input to the driving port of acousto-optic modulator 2 thus realizes the stable of laser power by the first drive source 10.
Frequency is ω
0laser after electrooptic modulator, its frequency by rf frequency Ω (being generally 5-20MHz) modulation, at carrier frequency (carrier frequency) ω
0both sides produce two frequencies and are respectively ω
0-Ω and ω
0the sideband of+Ω, the amplitude of these two sidebands is consistent but phase place is contrary, and when modulating frequency is greater than the live width of reference cavity, if carrier frequency to be adjusted the resonance frequency in chamber, then carrier wave can be coupled to inside chamber, and sideband can not be coupled in chamber.The signal of returning from cavity reflection utilizes photodiode or photomultiplier to receive, when the carrier frequency of laser is mated completely with the resonance frequency of reference cavity, but the equal phase place of sideband amplitude of returning from cavity reflection is contrary, the result caused is that the photoelectric current that photodiode exports does not comprise the composition that frequency is Ω.If the resonance frequency in laser frequency and chamber has certain off resonance, be designated as Δ ω, the amplitude of two sidebands so reflected does not disappear mutually, the composition that frequency is Ω is just comprised in the current signal that at this time photodiode exports, the amplitude of this composition is directly proportional to Δ ω, this signal after filtering after and local oscillation (Local oscillator, frequency is Ω) signal send into frequency mixer mixing, amplitude and the Δ ω of the output signal of frequency mixer are directly proportional, this signal is exactly error signal, high frequency (being generally MHz magnitude) and low frequency (being less than 1kHz) part is comprised in this signal, wherein the current source of the error signal feeding laser of HFS directly controls the Injection Current of laser diode, and low frequency part feeds back to the PZT of laser grating, control the angle of grating.In this way, the frequency range comprised that the scope that laser can lock is two modulation sideband,s, such as modulating frequency is 10MHz to profit, and the scope so locked is exactly each 10MHz in centre frequency left and right.
Operation principle of the present invention is such, and basic thought utilizes an acousto-optic modulator 2 and an electrooptic modulator 4.Stablizing for laser frequency, we utilize the locking of high-fineness optical resonator realization to laser frequency of Fabry-Bo Luo Gan interferometer 7, the reflected signal of optical resonator is obtained by polarization splitting prism 5, the frequency signal sent with the second drive source 11 after receiving with the second photodetector 9 carries out mixing, the deviation correcting signal obtaining frequency through low-pass filtering is divided into frequency band to be that the frequency deviation correction signal of 1kHz to 1MHz and the frequency deviation correction signal of below 1kHz feed back to the frequency modulation port of the first drive source 10 and the outside locking input of laser 1 circuit control box respectively as fast ring and slow ring, thus realize the frequency stabilization of laser.For power stability, hydrogen clock signal is input to the foreign frequency reference input of the first drive source 10 as stable frequency reference, frequency due to 1 order diffraction light of acousto-optic modulator 2 depends on the driving frequency of acousto-optic modulator 2, therefore, as long as ensure the output frequency Stability and veracity of the first drive source 10, just can ensure frequency accuracy and the stability of 1 laser of acousto-optic modulator 2, thus make the frequency of 1 order diffraction light of acousto-optic modulator 2 accurately and keep stable, we utilize 1 order diffraction light of acousto-optic modulator 2 to treat steady light as laser power stability.Power due to 1 order diffraction light of acousto-optic modulator 2 depends on the driving power of acousto-optic modulator 2, the i.e. power output of the first drive source 10, therefore by the power output of adjustment first drive source 10, the power of 1 order diffraction light of acousto-optic modulator 2 can just be regulated.The 1 order diffraction light by acousto-optic modulator 2 is carried out light splitting with a beam splitting chip 3, because beam splitting chip 3 does not possess polarization selectivity, therefore the power ratio of the transmitted light of laser after beam splitting chip 3 and reverberation is constant, can not change along with the change of laser polarization.The first photodetector 8 is utilized to detect, light signal is changed into voltage signal, again voltage signal is converted to digital signal through analog to digital converter 13, the numerical reference voltage of this digital signal and a sixteen bit compares, be converted to analog signal by digital analog converter 18 again after obtaining voltage deviation correcting signal and feed back to the pressure regulation port of the first drive source 10, thus regulate 1 order diffraction optical efficiency of acousto-optic modulator 2, the performance number so just laser power stability can wanted at us.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (2)
1. antihunt means for laser frequency and power, is characterized in that: the antihunt means of described laser frequency comprise the following steps:
1) the first-order diffraction light of laser by acousto-optic modulator is obtained;
2) the first-order diffraction light of acquisition is passed through electrooptic modulator, laser is made to produce two frequency band, namely three frequency contents are contained by the laser of electrooptic modulator, carrier angular frequency, radio-frequency component angular frequency+Ω and low-frequency component angular frequency-Ω, wherein Ω is the angular frequency size of the second drive source output signal;
3) laser by electrooptic modulator is injected Fabry-Bo Luo Gan interferometer after polarization splitting prism and λ/4 wave plate;
4) the reflective light intensity signal of Fabry-Bo Luo Gan interferometer is entered as frequency error signal with the second photodetector exploring laser light;
5) frequency error signal detected by the second photodetector and the frequency oscillator signal frequency mixer of the second drive source carry out mixing;
6) signal exported by frequency mixer obtains the deviation correcting signal of frequency through low pass filter;
7) deviation correcting signal of frequency be divided into frequency band to be that the frequency deviation correction signal of 1kHz to 1MHz and the frequency deviation correction signal of below 1kHz feed back to acousto-optic modulator and laser as fast ring and slow ring respectively by cable, thus realize laser frequency lock in Fabry-Bo Luo Gan interferometer;
The antihunt means of described laser power comprise the following steps:
1) hydrogen clock produces standard 10MHz frequency signal, the standard 10MHz frequency signal of generation is input to the foreign frequency reference input of the first drive source by cable;
2) the first-order diffraction light of laser by described acousto-optic modulator is obtained;
3) the first-order diffraction light of acquisition is separated a part by beam splitting chip to inject the first photodetector and be used for stabilized lasers power;
4) voltage signal that the first photodetector detects is input to analog to digital converter by cable, analog to digital converter is converted into digital signal, and hexadecimal numbers reference voltage source sends hexadecimal numbers reference voltage;
5) digital signal exported from analog to digital converter and hexadecimal numbers reference voltage are together sent into comparator to compare, thus obtain the voltage deviation correcting signal of laser power;
6) the voltage deviation correcting signal obtained is sent into digital to analog converter, digital to analog converter is translated into analog signal;
7) analog signal of conversion is input to the outside pressure regulation port of the first drive source by digital to analog converter through cable, thus changes the output signal voltage size of the first drive source;
8) voltage signal produced in step 7 is input to the driving port of acousto-optic modulator thus realizes the stable of laser power by the first drive source.
2. the antihunt means of laser frequency according to claim 1 and power, is characterized in that, described first drive source and the second drive source are signal generator.
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| CN113300203B (en) * | 2021-07-26 | 2021-10-08 | 济南量子技术研究院 | Rapid mode locking method and system for optical frequency comb |
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| CN116365349A (en) * | 2023-02-01 | 2023-06-30 | 航飞激器科技(杭州)有限公司 | Laser frequency locking system for locking laser frequency difference among multiple single-frequency lasers |
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