CN1435923A - Electro-optical switching method and structure for regulating Q in cavity - Google Patents

Electro-optical switching method and structure for regulating Q in cavity Download PDF

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CN1435923A
CN1435923A CN 02148543 CN02148543A CN1435923A CN 1435923 A CN1435923 A CN 1435923A CN 02148543 CN02148543 CN 02148543 CN 02148543 A CN02148543 A CN 02148543A CN 1435923 A CN1435923 A CN 1435923A
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CN1188939C (en
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陈长水
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Anhui Institute of Optics and Fine Mechanics of CAS
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Anhui Institute of Optics and Fine Mechanics of CAS
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Abstract

本发明是一种腔内调Q电光切换器的方法和结构，主要使用在同光束多脉冲激光器、同光束多脉冲多波长激光器，可用作差分吸收测污雷达光源，在双波长全息术、分光荧光诊断、卫星测距等研究领域均有重要的应用价值。腔内调Q电光切换器是由起偏器、调Q晶体、偏振分光器、调Q晶体的电控系统组成。通过调Q晶体电控系统使调Q晶体上分别产生1/4波电压、0波电压、1/2波电压，并控制调Q晶体上的电压变化的时序及电压改变的波形，获得特定组合的光束在A、B向传输特性。

The invention relates to a method and structure of an intracavity Q-switched electro-optic switcher, which is mainly used in multi-pulse lasers with the same beam, multi-pulse multi-wavelength lasers with the same beam, and can be used as a differential absorption pollution measurement radar light source, in dual-wavelength holography, Spectrofluorescence diagnosis, satellite ranging and other research fields have important application value. The intracavity Q-switched electro-optic switch is composed of a polarizer, a Q-switched crystal, a polarization beam splitter, and an electronic control system of a Q-switched crystal. Through the Q-switching crystal electronic control system, 1/4 wave voltage, 0-wave voltage, and 1/2 wave voltage are respectively generated on the Q-switching crystal, and the timing of voltage changes on the Q-switching crystal and the waveform of voltage change are controlled to obtain a specific combination. The transmission characteristics of the light beam in the A and B directions.

Description

The method and structure of transferring the Q electric light to switch in the chamber
Technical field
The present invention relates to the laser technology application, be specifically related to transfer in a kind of chamber the method and structure of Q electric light switch.
Background technology
At present, Q-regulating technique is made up of the electric-control system of the Effect of Back-Cavity Mirror of resonant cavity, adjusting Q crystal, polarizer, adjusting Q crystal in the typical chamber, if the fluorescent emission of laser crystal has polarization characteristic preferably, then the polarizer can omit.By the change in voltage on the adjusting Q crystal, carry out the variation control of laser Q value during work, obtain Q-switch laser output.This structure can only have the variation of Q value in the chamber of one road resonant cavity, is difficult to obtain the laser beam with light beam multiple-pulse multi-wavelength.
Summary of the invention
The objective of the invention is to design the method and structure of transferring Q electric light switch in a kind of chamber.
The method of transferring the Q electric light to switch in a kind of chamber, it is characterized in that forming accent Q electric light switch in the chamber by the electric-control system of the polarizer, adjusting Q crystal, polarizing beam splitter and adjusting Q crystal, electric-control system through adjusting Q crystal, offer voltage different on the adjusting Q crystal and voltage timing variations, come control beam to pass through the transmission direction of light beam behind the accent Q electric light switch in the chamber by the change in voltage on the adjusting Q crystal during work.
The placement of the polarizer, adjusting Q crystal and polarizing beam splitter must be satisfied one of following four kinds of operating states, operating state 1 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the all-wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along B to transmission, set when voltage is half-wave voltage on the crystal, light beam is by behind the adjusting Q crystal again, and the polarization direction has rotated 90 degree, be polarized the optical splitter effect, along A to transmission.When the voltage on adjusting Q crystal is 1/4 wave voltage, then light beam by the time, half light energy along A to transmission, half light energy along B to transmission.Operating state 2 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the all-wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along A to transmission, be polarized the optical splitter effect, along B to transmission.When the voltage on adjusting Q crystal is 1/4 wave voltage, then light beam by the time, half light energy along A to transmission, half light energy along B to transmission.Operating state 3 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the half-wave voltage, when then light beam passes through, half light energy along A to transmission, half light energy along B to transmission, when the voltage on adjusting Q crystal is 1/4 wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along B to transmission, set again on the crystal when being 3/4 wave voltage or negative 1/4 wave voltage, light beam is by behind the adjusting Q crystal, the polarization direction rotated 90 the degree, be polarized the optical splitter effect, along A to transmission.Operating state 4 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the half-wave voltage, when then light beam passes through, half light energy along A to transmission, half light energy along B to transmission, when the voltage on adjusting Q crystal is 1/4 wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along A to transmission, set again on the crystal when being 3/4 wave voltage or negative 1/4 wave voltage, light beam is by behind the adjusting Q crystal, the polarization direction rotated 90 the degree, be polarized the optical splitter effect, along B to transmission.
It is characterized in that by the variation of the voltage on the electric control system controls adjusting Q crystal of adjusting Q crystal and the sequential and the change in voltage waveform of change in voltage, and then the transmission direction of control beam, corresponding work sequential and characteristic.
It is characterized in that and to transfer Q electric light switch and front cavity mirror, laser crystal, two cover tuned cells and Effect of Back-Cavity Mirror to form the resonant cavity that contains two way chambeies in the chamber, and it is selective along A and B in resonant cavity to the wavelength of the light beam of transmission, then when transferring Q electric light switch to be operating state 1 and operating state 2 in the accent Q chamber in the accent Q chamber in the chamber, when not having voltage on the adjusting Q crystal or being all-wave voltage, system obtains one tunnel laser output; When voltage on the adjusting Q crystal was half-wave voltage, system obtained another road laser output; When the voltage on the adjusting Q crystal was 1/4 wave voltage, light beam was in intrasystem one-way transmission, half energy of loss, and round trip will lose 75% energy, make the Q value of resonant cavity lower, again by the gain of control resonant cavity, can no-output.Then when transferring Q electric light switch to be operating state 3 and operating state 4 in the accent Q chamber in the accent Q chamber in the chamber, when the voltage on the adjusting Q crystal was 1/4 wave voltage, system obtained the output of one road laser; When voltage on the adjusting Q crystal was 3/4 wave voltage or negative 1/4 wave voltage, system obtained another road laser output; When not having voltage on the adjusting Q crystal or being half-wave voltage, light beam is in intrasystem one-way transmission, and half energy of loss, round trip will lose 75% energy, make the Q value of resonant cavity lower, again by the gain of control resonant cavity, and can no-output.
It is characterized in that transferring in the chamber Q electric light switch in resonant cavity, and selective along A and B in resonant cavity to the wavelength of the light beam of transmission, then can realize the switching of the oscillation wavelength in the resonant cavity, finish the multipulse Q-switch laser output of multi-wavelength.
Its feature comprises the polarizer, adjusting Q crystal, the electric-control system of polarizing beam splitter and adjusting Q crystal, the polarizer, adjusting Q crystal, polarizing beam splitter is arranged successively, must satisfy one of following four kinds of operating states, operating state 1 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the all-wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along B to transmission, set again when voltage is half-wave voltage on the crystal, light beam is by behind the adjusting Q crystal, the polarization direction has rotated 90 degree, be polarized the optical splitter effect, along A to transmission.When the voltage on adjusting Q crystal is 1/4 wave voltage, then light beam by the time, half light energy along A to transmission, half light energy along B to transmission.Operating state 2 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the all-wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along A to transmission, set again when voltage is half-wave voltage on the crystal, light beam is by behind the adjusting Q crystal, the polarization direction rotated 90 the degree, be polarized the optical splitter effect, along B to transmission.When the voltage on adjusting Q crystal is 1/4 wave voltage, then light beam by the time, half light energy along A to transmission, half light energy along B to transmission.Operating state 3 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the half-wave voltage, when then light beam passes through, half light energy along A to transmission, half light energy along B to transmission, when the voltage on adjusting Q crystal is 1/4 wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along B to transmission, set again on the crystal when being 3/4 wave voltage or negative 1/4 wave voltage, light beam is by behind the adjusting Q crystal, the polarization direction rotated 90 the degree, be polarized the optical splitter effect, along A to transmission.Operating state 4 is as follows: light beam is a light beam when propagating the arrival adjusting Q crystal by the polarizer, and there is not voltage on the setting adjusting Q crystal or when the half-wave voltage, when then light beam passes through, half light energy along A to transmission, half light energy along B to transmission, when the voltage on adjusting Q crystal is 1/4 wave voltage, the light beam low-loss by adjusting Q crystal and polarizing beam splitter after along A to transmission, set again on the crystal when being 3/4 wave voltage or negative 1/4 wave voltage, light beam is by behind the adjusting Q crystal, the polarization direction rotated 90 the degree, be polarized the optical splitter effect, along B to transmission.
Description of drawings Fig. 1 transfers Q electric light switch concrete application structure schematic diagram in obtaining with bundle dual wavelength dipulse Q-switched laser in a kind of chamber.Fig. 2 is a structural representation of transferring Q electric light switch in the chamber.
Embodiment
To transfer Q electric light switch in the chamber is that operating state 1 is an example, and other state class seemingly.
Referring to Fig. 1,2, wherein 1, front cavity mirror, 2, tunable laser crystal, 3, transfer Q electric light switch in the chamber, 4,5 tuned cells, 6,7 Effect of Back-Cavity Mirror, 8, xenon lamp, 9, play device partially, 10 adjusting Q crystals, 11, polarizing beam splitter, 12, the electric-control system of adjusting Q crystal, A to the beam Propagation direction of B after being respectively the mutually perpendicular beam split in polarization direction.
The present invention uses in light beam double wavelength and double pulse laser device a kind of.This system is made up of the electric-control system 12 and the photoflash lamp 8 of front cavity mirror 1, laser crystal 2, the polarizer 9, adjusting Q crystal 10, polarizing beam splitter 11, two cover tuned cells 4,5 and Effect of Back-Cavity Mirror 6,7 and adjusting Q crystal successively from left to right.The laser crystal 2 that is suitable for doing photoflash lamp 8 pumpings is tunable laser crystal 2, itself has a polarization characteristic if laser crystal is luminous, and the polarizer 9 can omit (as mix chromium strontium fluoride aluminium Cr:LiSAF, mix chromium calcirm-fluoride aluminium Cr:LiCAF crystal).Utilize the polarizer 9, have the crystal 10 of transferring the Q function and polarizing beam splitter 11 accent Q electric light switch in the chamber that (as the film polarizer etc.) form, in the time of a pumping pulse, successively vibrate in the two way chambeies that make laser in front cavity mirror 1, laser crystal 2, chamber, transfer Q electric light switch 3, two cover tuned cells 4,5 and Effect of Back-Cavity Mirror 6,7 to form, its two-way wavelength difference has the dipulse of two different wave lengths to export from front cavity mirror in same light beam thereby reach.
The electric-control system 12 of adjusting Q crystal offers adjusting Q crystal 10 different voltage and wave voltage timing variations, the starting of oscillation, failure of oscillation and the multipulse generation that come the control chamber inner light beam by the change in voltage on the adjusting Q crystal 10 during work.
The electric-control system 12 of adjusting Q crystal adds on adjusting Q crystal 10 and moves back the following plurality of processes of being changed to of voltage:
1, before photoflash lamp 8 work, on adjusting Q crystal 10, add quarter-wave voltage (or being the positive and negative odd-multiple voltage of quarter-wave voltage), at this moment, light is by behind 9,10,11 elements, along A, B to each half transmission, because the oscillation wavelength difference of two-way, so two-way all is in the low reactance-resistance ratio state, by adjusting the gain (can pass through the photoflash lamp 8 pumping voltages of control tunable laser crystal 2) in the resonant cavity, two-way all can not starting of oscillation, does not have laser output;
2, after photoflash lamp 8 flashes of light, the time-delay certain hour (can determine according to actual needs by this time, be generally near the pumping peak value of the photoflash lamp of delaying time), utilize thyratron or other power technology to change the voltage on the adjusting Q crystal 10 into no-voltage or positive and negative all-wave voltage, at this moment the road system that is made up of element 1,2,3,5,7 is in high Q value, and be in low reactance-resistance ratio by 1,2,3,4,6 another road systems that form, the adjustable Q laser pulse of a road the resonance wavelength that nonoscillatory, output are made up of element 1,2,3,5,7;
3, the 100ns that delays time again is above, and (its greatest length is based on laser crystal 2 and pumping characteristic and experimental result to the number microsecond, with in the interbody spacer at this moment by element 1,2,3,5, a road of 7 compositions can only be exported a Q impulse and exceed), utilize 12 with voltage on 10 change into fast quarter-wave voltage (or for quarter-wave voltage just, negative odd-multiple voltage), this time is by 9,10, behind 11 elements, along A, B is to each half transmission, because two way oscillation wavelength differences, so two-way all is in the low reactance-resistance ratio state, by adjusting the gain (can pass through the photoflash lamp 8 pumping voltages of control tunable laser crystal 2) in the resonant cavity, two-way all can not starting of oscillation, does not have laser output.
4, delaying time a period of time, (this delay time starting point at interval is that the place as a result of process 2 is calculated again, if the half width of photoflash lamp 8 pumping pulses is greater than the upper level lifetime of laser crystal 2, then Yan Shi time is about the upper level lifetime of laser crystal, otherwise be limited to the upper level lifetime of laser crystal in the time-delay), utilize thyratron or other power technology to change the voltage on the adjusting Q crystal 10 into 1/2nd wave voltages or negative 1/2nd wave voltages, at this moment by element 1,2,3,4,6 road systems that form are in high Q value, and by 1,2,3,4, the adjustable Q laser pulse of 6 road the resonance wavelengths of forming;
5, finish the back before photoflash lamp 8 next pumpings in vibration then, the voltage on the adjusting Q crystal 10 returns to quarter-wave voltage, prepares to carry out next cycle.

Claims (6)

1、一种腔内调Q电光切换的方法，其特征在于有起偏器、调Q晶体、偏振分光器和调Q晶体的电控系统组成腔内调Q电光切换器，经调Q晶体的电控系统，提供给调Q晶体上不同的电压和电压时序变化，工作时靠调Q晶体上的电压变化来控制光束通过腔内调Q电光切换器后光束的传输方向。1. A method for intracavity Q-switching electro-optic switching, characterized in that an intracavity Q-switching electro-optic switch is formed by an electric control system including a polarizer, a Q-switching crystal, a polarization beam splitter and a Q-switching crystal. The electronic control system provides different voltages and voltage timing changes on the Q-switched crystal. During operation, the voltage change on the Q-switched crystal is used to control the transmission direction of the beam after passing through the Q-switched electro-optic switch in the cavity. 2、根据权利要求1所述的一种腔内调Q电光切换的方法，其特征在于起偏器、调Q晶体和偏振分光器的放置必须满足如下四种工作状态之一，工作状态1如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为全波电压时，光束低损耗通过调Q晶体和偏振分光器后沿B向传输，再设定晶体上电压为半波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿A向传输；在调Q晶体上的电压为1/4波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输。工作状态2如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为全波电压时，光束低损耗通过调Q晶体和偏振分光器后沿A向传输，再设定晶体上电压为半波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿B向传输；在调Q晶体上的电压为1/4波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输，工作状态3如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为半波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输，在调Q晶体上的电压为1/4波电压时，光束低损耗通过调Q晶体和偏振分光器后沿B向传输，再设定晶体上为3/4波电压或负1/4波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿A向传输；工作状态4如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为半波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输，在调Q晶体上的电压为1/4波电压时，光束低损耗通过调Q晶体和偏振分光器后沿A向传输，再设定晶体上为3/4波电压或负1/4波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿B向传输。2. A method for intracavity Q-switched electro-optic switching according to claim 1, characterized in that the placement of polarizers, Q-switched crystals and polarization beam splitters must satisfy one of the following four working states, working state 1 is as follows : When the beam propagates through the polarizer and reaches the Q-switched crystal, it is a polarized beam, and when there is no voltage or full-wave voltage on the Q-switched crystal, the beam with low loss passes through the Q-switched crystal and the polarization beam splitter and then transmits along the B direction, and then When the voltage on the crystal is set to a half-wave voltage, the polarization direction of the beam rotates 90 degrees after passing through the Q-switched crystal, and is transmitted along the A direction by the action of the polarization beam splitter; when the voltage on the Q-switched crystal is 1/4 wave voltage , then when the beam passes, half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction. Working state 2 is as follows: when the beam propagates through the polarizer and reaches the Q-switched crystal, it is a polarized beam, and when there is no voltage or full-wave voltage on the Q-switched crystal, the beam passes through the Q-switched crystal and the polarization beam splitter with low loss at the rear edge A When the voltage on the crystal is set to a half-wave voltage, the polarization direction of the beam is rotated by 90 degrees after passing through the Q-switched crystal, and is transmitted along the B direction by the action of the polarization beam splitter; the voltage on the Q-switched crystal is 1/ When the voltage is 4 waves, when the beam passes, half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction. When there is no voltage or half-wave voltage on the Q crystal, when the beam passes, half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction. When the voltage on the Q-switched crystal is 1/4 wave voltage, the beam is low The loss is transmitted along the B direction after passing through the Q-switched crystal and the polarization beam splitter. When the crystal is set to 3/4 wave voltage or negative 1/4 wave voltage, after the beam passes through the Q-switched crystal, the polarization direction is rotated by 90 degrees and is The polarizing beam splitter works and transmits along the A direction; the working state 4 is as follows: when the beam propagates through the polarizer and reaches the Q-switching crystal, it is a polarized beam, and when there is no voltage or half-wave voltage on the Q-switching crystal, the beam passes through , half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction. When the voltage on the Q-switched crystal is 1/4 wave voltage, the light beam with low loss passes through the Q-switched crystal and the polarization beam splitter and then transmits along the A direction, and then When the crystal is set to 3/4 wave voltage or negative 1/4 wave voltage, after the light beam passes through the Q-switched crystal, the polarization direction is rotated by 90 degrees, and is transmitted along the B direction by the polarization beam splitter. 3、根据权利要求1所述的一种腔内调Q电光切换的方法，其特征在于通过调Q晶体的电控系统控制调Q晶体上的电压的变化和电压变化的时序和电压变化波形，进而控制光束的传输方向、相应的工作时序和特性。3. A method for intracavity Q-switched electro-optic switching according to claim 1, characterized in that the voltage change on the Q-switched crystal and the timing and voltage change waveform of the voltage change are controlled by the electronic control system of the Q-switched crystal, Then control the transmission direction of the light beam, the corresponding working sequence and characteristics. 4、根据权利要求1所述的一种腔内调Q电光切换的方法，其特征在于将腔内调Q电光切换器和前腔镜、激光晶体、两套调谐元件和后腔镜组成含两路子腔的谐振腔，且在谐振腔内沿A和B向传输的光束的波长有选择性，则当腔内调Q电光切换器为工作状态1和工作状态2时，调Q晶体上没有电压或为全波电压时，系统获得一路的激光输出；当调Q晶体上电压为半波电压时，系统获得另一路激光输出；当调Q晶体上的电压为1/4波电压时，光束在系统内的单向传输，损耗一半能量，往返一次将损失75％的能量，使谐振腔的Q值较低，再通过控制谐振腔的增益，可以无输出；则当腔内调Q电光切换器为工作状态3和工作状态4时，当调Q晶体上的电压为1/4波电压时，系统获得一路激光输出；当调Q晶体上电压为3/4波电压或负1/4波电压时，系统获得另一路激光输出；调Q晶体上没有电压或为半波电压时，光束在系统内的单向传输，损耗一半能量，往返一次将损失75％的能量，使谐振腔的Q值较低，再通过控制谐振腔的增益，可以无输出。4. A method for intracavity Q-switched electro-optic switching according to claim 1, characterized in that the intracavity Q-switched electro-optic switch, the front cavity mirror, the laser crystal, two sets of tuning elements and the rear cavity mirror are composed of two The resonant cavity of the sub-cavity, and the wavelength of the beam transmitted along the A and B directions in the resonant cavity is selective, then when the Q-switched electro-optic switch in the cavity is in working state 1 and working state 2, there is no voltage on the Q-switching crystal Or when the voltage is full wave, the system obtains one laser output; when the voltage on the Q-switched crystal is half-wave voltage, the system obtains another laser output; when the voltage on the Q-switched crystal is 1/4 wave voltage, the beam is in One-way transmission in the system consumes half of the energy, and one round trip will lose 75% of the energy, so that the Q value of the resonant cavity is low, and then by controlling the gain of the resonant cavity, there can be no output; In working state 3 and working state 4, when the voltage on the Q-switched crystal is 1/4 wave voltage, the system obtains one laser output; when the voltage on the Q-switched crystal is 3/4 wave voltage or negative 1/4 wave voltage , the system obtains another laser output; when there is no voltage or half-wave voltage on the Q-switched crystal, the unidirectional transmission of the beam in the system will lose half of the energy, and 75% of the energy will be lost for one round trip, making the Q value of the resonator Low, and then by controlling the gain of the resonant cavity, there can be no output. 5、根据权利要求1、4所述的一种腔内调Q电光切换的方法，其特征在于腔内腔内调Q电光切换器在谐振腔内，且在谐振腔内沿A和B向传输的光束的波长有选择性，则可以实现谐振腔内的振荡波长的切换，完成多波长多脉冲的调Q激光输出。5. A method for intracavity Q-switched electro-optic switching according to claims 1 and 4, characterized in that the intracavity intracavity Q-switched electro-optic switch is in the resonant cavity, and transmits along the A and B directions in the resonant cavity If the wavelength of the beam is selective, the switching of the oscillation wavelength in the resonator can be realized, and the multi-wavelength and multi-pulse Q-switched laser output can be completed. 6、根据权利要求1所述的一种腔内调Q电光切换的结构，其特征包括起偏器、调Q晶体、偏振分光器和调Q晶体的电控系统，起偏器、调Q晶体、偏振分光器依次排布，必须满足如下四种工作状态之一，工作状态1如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为全波电压时，光束低损耗通过调Q晶体和偏振分光器后沿B向传输，再设定晶体上电压为半波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿A向传输。在调Q晶体上的电压为1/4波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输；工作状态2如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为全波电压时，光束低损耗通过调Q晶体和偏振分光器后沿A向传输，再设定晶体上电压为半波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿B向传输；在调Q晶体上的电压为1/4波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输；工作状态3如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为半波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输，在调Q晶体上的电压为1/4波电压时，光束低损耗通过调Q晶体和偏振分光器后沿B向传输，再设定晶体上为3/4波电压或负1/4波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿A向传输；工作状态4如下：光束通过起偏器传播到达调Q晶体时为偏振光束，并设定调Q晶体上没有电压或为半波电压时，则光束通过时，一半光能量沿A向传输，一半光能量沿B向传输，在调Q晶体上的电压为1/4波电压时，光束低损耗通过调Q晶体和偏振分光器后沿A向传输，再设定晶体上为3/4波电压或负1/4波电压时，光束通过调Q晶体后，偏振方向旋转了90度，被偏振分光器作用，沿B向传输。6. A Q-switched electro-optic switching structure in a cavity according to claim 1, characterized in that it comprises a polarizer, a Q-switched crystal, an electric control system for a polarizing beam splitter and a Q-switched crystal, the polarizer, a Q-switched crystal , Polarizing beam splitters are arranged sequentially, and must meet one of the following four working states. Working state 1 is as follows: when the beam propagates through the polarizer and reaches the Q-switched crystal, it is a polarized beam, and it is set that there is no voltage on the Q-switched crystal or it is full When the wave voltage is used, the light beam passes through the Q-switched crystal and the polarization beam splitter with low loss and then transmits along the B direction. When the voltage on the crystal is set to half-wave voltage, the polarization direction of the beam is rotated by 90 degrees after passing through the Q-switched crystal, and is polarized and split The device works and transmits along the A direction. When the voltage on the Q-switched crystal is 1/4 wave voltage, when the light beam passes through, half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction; the working state 2 is as follows: the light beam propagates through the polarizer and reaches the Q-switched When the crystal is a polarized beam, and when there is no voltage on the Q-switched crystal or a full-wave voltage, the light beam passes through the Q-switched crystal and polarizing beam splitter with low loss and then transmits along the A direction, and then the voltage on the crystal is set to a half-wave voltage , after the beam passes through the Q-switched crystal, the polarization direction is rotated by 90 degrees, and is transmitted along the B direction by the action of the polarization beam splitter; when the voltage on the Q-switched crystal is 1/4 wave voltage, when the beam passes through, half of the light energy along Transmission in the A direction, half of the light energy is transmitted along the B direction; the working state 3 is as follows: when the beam propagates through the polarizer and reaches the Q-switching crystal, it is a polarized beam, and when there is no voltage or half-wave voltage on the Q-switching crystal, the beam When passing through, half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction. When the voltage on the Q-switched crystal is 1/4 wave voltage, the light beam with low loss passes through the Q-switched crystal and the polarization beam splitter and then transmits along the B direction. , when the voltage on the crystal is set to 3/4 wave voltage or negative 1/4 wave voltage, after the light beam passes through the Q-switched crystal, the polarization direction is rotated by 90 degrees, and is transmitted along the direction A by the action of the polarization beam splitter; the working state 4 is as follows : When the beam propagates through the polarizer and reaches the Q-switched crystal, it is a polarized beam, and if there is no voltage or half-wave voltage on the Q-switched crystal, then when the beam passes, half of the light energy is transmitted along the A direction, and half of the light energy is transmitted along the B direction When the voltage on the Q-switched crystal is 1/4 wave voltage, the light beam with low loss passes through the Q-switched crystal and polarization beam splitter and then transmits along the A direction, and then set the crystal to 3/4 wave voltage or negative 1/2 When the voltage is 4 waves, after the light beam passes through the Q-switched crystal, the polarization direction is rotated by 90 degrees, and it is transmitted along the B direction by the polarization beam splitter.
CNB021485437A 2002-12-11 2002-12-11 Electro-optical switching method and structure for regulating Q in cavity Expired - Fee Related CN1188939C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101266342B (en) * 2007-08-08 2010-12-29 北京师范大学 Polarization state for controlling two bundle of pulsed laser by out-cavity electro-optical polarization controller
CN108963746A (en) * 2017-05-24 2018-12-07 中国科学院理化技术研究所 Laser using method, pulse width adjustable laser and using method thereof
CN110752503A (en) * 2019-05-09 2020-02-04 长春理工大学 Single longitudinal mode and non-single longitudinal mode double-pulse laser alternate Q-switching output method and laser

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101266342B (en) * 2007-08-08 2010-12-29 北京师范大学 Polarization state for controlling two bundle of pulsed laser by out-cavity electro-optical polarization controller
CN108963746A (en) * 2017-05-24 2018-12-07 中国科学院理化技术研究所 Laser using method, pulse width adjustable laser and using method thereof
CN108963746B (en) * 2017-05-24 2020-06-26 中国科学院理化技术研究所 Method of using laser, laser with adjustable pulse width and method of using the same
CN110752503A (en) * 2019-05-09 2020-02-04 长春理工大学 Single longitudinal mode and non-single longitudinal mode double-pulse laser alternate Q-switching output method and laser

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