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 PDFInfo
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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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Abstract
An in-cavity Q-regulating photo-electric switching device used for same beam multi-pulse laser, same-beam multi-pulse multi-wavelength laser, pollution measuring radar, dual-wavelength homography, spectrofluorescence diagnosis, satellite range finding, etc is composed of polarizer, Q-regulating crystal, polarized splitter and electric control system of Q-regulating crystal. Under the control of said control system, the Q-regulating crystal can respectively generate 1/4-wave, O-wave and 1/2-wave voltages, whose time sequence and waveforms can be controlled to obtain the transmission characteristics of particularly combined beam in directions A and B.
Description
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, the method for 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.
2, the method of transferring the Q electric light to switch in a kind of chamber according to claim 1, it is characterized in that the polarizer, the placement of 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 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, when then light beam passes through, 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.
3, the method for transferring the Q electric light to switch in a kind of chamber according to claim 1, 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.
4, the method for transferring the Q electric light to switch in a kind of chamber according to claim 1, 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 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, and the gain by the control resonant cavity again can no-output; Then when transferring Q electric light switch to be operating state 3 and operating state 4 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.
5, according to the method for transferring the Q electric light to switch in claim 1, the 4 described a kind of chambeies, it is characterized in that transferring in the inner chamber of chamber Q electric light switch in resonant cavity, and it is 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.
6, the structure of transferring the Q electric light to switch in a kind of chamber according to claim 1, 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021485437A CN1188939C (en) | 2002-12-11 | 2002-12-11 | Electro-optical switching method and structure for regulating Q in cavity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021485437A CN1188939C (en) | 2002-12-11 | 2002-12-11 | Electro-optical switching method and structure for regulating Q in cavity |
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| CN1435923A true CN1435923A (en) | 2003-08-13 |
| CN1188939C CN1188939C (en) | 2005-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (3)
| 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 |
-
2002
- 2002-12-11 CN CNB021485437A patent/CN1188939C/en not_active Expired - Fee Related
Cited By (4)
| 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 | 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 |
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| Publication number | Publication date |
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| CN1188939C (en) | 2005-02-09 |
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