CN1225066C - Homo-light-beam double-wavelength double-pulse laser generating method - Google Patents
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- CN1225066C CN1225066C CN 02148544 CN02148544A CN1225066C CN 1225066 C CN1225066 C CN 1225066C CN 02148544 CN02148544 CN 02148544 CN 02148544 A CN02148544 A CN 02148544A CN 1225066 C CN1225066 C CN 1225066C
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Abstract
The present invention relates to a method for generating dual-wavelength dipulse lasers with the same light beams. A laser crystal is a tunable laser crystal which is suitable for flashlight pumping, can obtain Q-switching pulse output, and can be used for differential absorbing pollution monitoring radar, holographic molecular fluorescence diagnosis, satellite distance measurement, etc. But two pulse light beams in the prior art are separate in space, or two pulses can not be independently adjustable at all wavebands of the laser crystal so that the prior art is not conveniently used for measurement. Lasers are orderly oscillated in two paths of subcavities by an electro-optic switcher by the present invention within the pulse time of once pumping, the oscillation wavelengths of the two paths are different, and both of the two pulses are Q pulses so as to achieve that the same light beams are provided with dual-wavelength dipulse output.
Description
Technical field
The present invention relates to laser technology field, be specifically related to the production method of double wavelength and double pulse laser.
Background technology
January nineteen ninety-five, Germany " optics and optoelectronics news " the remote sensing monograph delivered one piece for a short time and has been entitled as " and the three-dimensional atmospheric pollution monitoring of vehicle-mounted total solidifying laser radar system paper (J.P.wolf; " 3-DminitoringOf air poilution using mobile All-Solid-State lidar system ", optics﹠amp; Photonics news, Jan, 1995, P27), disclose the method that a kind of use has the prism rotation of parallel surfaces in the literary composition and realized the method that two wavelength switch, and be used for Difference Absorption and survey dirty system.The photon journal had been published Ruan Shuangchen etc. in 1996 " dual wavelength mixes chromium lithium fluoride strontium aluminum laser " photon journal V01.25, N08,768 (1996), be with argon laser pumping Cr:LiSAF laser crystal, obtained continuous dual laser output.The name that is proposed in August, 1999 by China Science ﹠ Technology University is called " dual wavelength dipulse harmonic wave tunable laser and dual wavelength harmonic wave production method " (patent of invention, the patent No.: ZL99108774.7) be that the direction of propagation is identical too and pulsed light beam different wave length spatially separates, be not easy to the use of DIAL, in a same flash lamp pumping, the two Q impulse tunable laser of output dual wavelength yet there are no report in the same light beam.
Summary of the invention
The objective of the invention is in the pumping pulse that photoflash lamp produces, utilization has the electric light switch, make laser vibration successively in two way chambeies, produce the laser pulse of two follow-ups, tuned cell and Effect of Back-Cavity Mirror separately passed through on every road, make its two-way oscillation wavelength difference, thereby reach the pulse output that two different wave lengths are arranged in same light beam.
A kind of production method with the light beam double wavelength and double pulse laser, it is characterized in that using the tunable laser crystal that is suitable for doing flash lamp pumping, the output of acquisition adjusting Q pulse laser, utilization has the crystal and the polarizer of transferring the Q function, polarization spectroscope, electric-control system is formed the electric light switch, two groups of tuned cells and Effect of Back-Cavity Mirror are arranged behind the electric light switch, in the time of a pumping pulse, through the adjusting Q crystal electric-control system, offer voltage different on the adjusting Q crystal and voltage timing variations, control transmission direction and the corresponding work sequential of laser beam by the change in voltage on the adjusting Q crystal by laser beam behind the electric light switch, make laser by front cavity mirror, laser crystal, the polarizer, have crystal and the polarization spectroscope of transferring the Q function, successively vibrate in the two way chambeies of the resonant cavity that every group of tuned cell and Effect of Back-Cavity Mirror are formed, its two-way oscillation wavelength difference, in same light beam, there is the dipulse of different wave length to export thereby reach, itself has polarization characteristic then can save the polarizer if laser crystal is luminous from front cavity mirror;
The placement of the polarizer of electric light switch, 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, 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;
When electric light switch operating state was state 1 or state 2, when not having voltage on the adjusting Q crystal or being all-wave voltage, system obtained the output of one road laser; 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, and half energy of loss makes the Q value of resonant cavity lower, again by the gain of control resonant cavity, and can no-output.When electric light switch operating state was state 3 or state 4, 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 1/2 wave voltage, light beam is one-way transmission in system, and half energy of loss makes the Q value of resonant cavity lower, again by the gain of control resonant cavity, and can no-output.
It is characterized in that laser crystal is the tunable laser crystal that is fit to do flash lamp pumping, can be to mix chromium lithium strontium aluminium fluoride Cr:LiSAF or mix chromium aluminum fluoride calcium lithium Cr:LiCAF crystal.
The output wavelength that it is characterized in that two pulses is independent adjustable in the fluorescence linewidth of laser crystal respectively, and two wavelength are not same wavelength, when tunable crystal is the Cr:LiSAF laser crystal, can obtain the double wavelength and double pulse laser bundle of 900nm wave band, behind harmonic wave, be effective wave band of differential absorption lidar.
It is characterized in that in the burst length of a pumping produce the laser pulse of two follow-ups, each laser pulse is Q impulse, its pulse duration is all less than 100ns.
It is characterized in that the two-way pulse tuned cell placement must with the polarization direction of light beam coupling, when a road during as one tunnel output of tuned cell place, tuned cell must be the placement side of loss minimum in resonant cavity
The present invention is at O
3, NO, NO
2, SO
2Etc. the measurement of gas concentration, in the double-wavelength holographic art, research fields such as molecular fluorescence diagnosis, satellite ranging all have important use to be worth.
Description of drawings
Fig. 1 is a structural principle schematic diagram of the present invention.
Fig. 2 is an electric light switch structural representation.
Embodiment
Referring to Fig. 1,2.Wherein 1, front cavity mirror, 2, laser crystal, 3, electric light switch, 4,5, tuned cell, 6,7, Effect of Back-Cavity Mirror, 8, photoflash lamp, 9, the polarizer, 10, adjusting Q crystal, 11, polarization spectroscope, 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.
A kind of production method of the present invention with the light beam double wavelength and double pulse laser, use photoflash lamp 8 pumping tunable laser crystals 2, utilize the polarizer 9, have the crystal 10 of accent Q function and the electric light switch 3 of polarization spectroscope 11 (as the film polarizer) composition, in the time of a pumping pulse, make laser at front cavity mirror 1, laser crystal 2, electric light switch 3, priority is vibrated in the two way chambeies that two cover tuned cells 4 and 5 are formed with Effect of Back-Cavity Mirror 6 and 7, its two-way oscillation wavelength difference is exported from front cavity mirror 1 thereby reach the Q impulse that two different wave lengths are arranged in same light beam.
The laser crystal 2 that is fit to do flash lamp pumping is tunable laser crystal (as mix chromium lithium strontium aluminium fluoride Cr:LiSAF, mix chromium aluminum fluoride calcium lithium Cr:LiCAF).The effect of electric light switch 3 is in 8 pumpings of photoflash lamp, Q is transferred in timesharing in the chamber of resonant cavity, in same light beam, can produce the output of dual wavelength dipulse, its concrete structure is to utilize to have the crystal 10 of transferring the Q function, the polarizer 9, the electric-control system 12 of polarization spectroscope 11 and adjusting Q crystal is formed, if tunable laser crystal 2 itself has polarization characteristic, 9 of the polarizers can omit, the electric-control system 12 of adjusting Q crystal offers adjusting Q crystal 10 different regulation and control voltage and voltage timing variations, during work, in photoflash lamp 8 pumpings, the starting of oscillation of leaning on the change in voltage on the adjusting Q crystal 10 to come the control chamber inner light beam, failure of oscillation and multipulse generation.The electric-control system 12 of adjusting Q crystal applies the variation of voltage on adjusting Q crystal 10 and (with the electric light switch is that operating state 1 is an example with the following plurality of processes that is produced as of restrainting the dual wavelength dipulse, other state class is seemingly): 1, before photoflash lamp 8 work, on adjusting Q crystal 10, add quarter-wave voltage (or for quarter-wave voltage just, negative odd-multiple voltage), at this moment, light is by 9,10, behind 11 elements, along A, B is to each half transmission, in resonant cavity, 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 of 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 serves as the main parameter of determining with the pumping characteristic and the experimental result of laser crystal 2 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 cavity oscillations 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 2 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, by 1,2,3,4, a road of 6 compositions are exported the adjustable Q laser pulse of its resonance wavelength:
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.Simultaneously, the optical maser wavelength of two-way output is all independent adjustable in the tuning range of laser crystal 2, as seen, in the burst length of a pumping, laser is vibration successively in two way chambeies, its two-way oscillation wavelength difference, and two pulses are the Q pulse, thus reach in intrafascicular have dual wavelength, the dipulse output of sharing the same light.
The output wavelength of two pulses is in the fluorescence linewidth of laser crystal 2 independent adjustable (but two wavelength can not be same wavelength) respectively.To obtaining near the double wavelength and double pulse laser bundle the 900nm, behind harmonic wave, be effective wave band of differential absorption lidar especially.
In the burst length of a pumping, produce the laser pulse of two follow-ups, each laser pulse is Q impulse, and its pulse duration is all less than 100ns.
Claims (4)
1, a kind of production method with the light beam double wavelength and double pulse laser, it is characterized in that using the tunable laser crystal that is suitable for doing flash lamp pumping, the output of acquisition adjusting Q pulse laser, utilization has the crystal and the polarizer of transferring the Q function, polarization spectroscope, electric-control system is formed the electric light switch, two groups of tuned cells and Effect of Back-Cavity Mirror are arranged behind the electric light switch, in the time of a pumping pulse, through the adjusting Q crystal electric-control system, offer voltage different on the adjusting Q crystal and voltage timing variations, control transmission direction and the corresponding work sequential of laser beam by the change in voltage on the adjusting Q crystal by laser beam behind the electric light switch, make laser by front cavity mirror, laser crystal, the polarizer, have crystal and the polarization spectroscope of transferring the Q function, successively vibrate in the two way chambeies of the resonant cavity that every group of tuned cell and Effect of Back-Cavity Mirror are formed, its two-way oscillation wavelength difference, in same light beam, there is the dipulse of different wave length to export thereby reach, itself has polarization characteristic then can save the polarizer if laser crystal is luminous from front cavity mirror;
The placement of the polarizer of electric light switch, 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 has rotated 90 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.
2, the production method with the light beam double wavelength and double pulse laser according to claim 1 is characterized in that laser crystal is the tunable laser crystal that is fit to do flash lamp pumping, can be to mix the chromium lithium strontium aluminium fluoride or mix chromium aluminum fluoride calcium crystalline lithium.
3, the production method with the light beam double wavelength and double pulse laser according to claim 1, the output wavelength that it is characterized in that two pulses is independent adjustable in the fluorescence linewidth of laser crystal respectively, and two wavelength are not same wavelength, when tunable crystal when mixing chromium strontium aluminium fluoride lithium laser crystal, can obtain the double wavelength and double pulse laser bundle of 900nm wave band, behind harmonic wave, be effective wave band of differential absorption lidar.
4, the production method with the light beam double wavelength and double pulse laser according to claim 1, it is characterized in that in the burst length of a pumping, produce the laser pulse of two follow-ups, each laser pulse is Q impulse, and its pulse duration is all less than 100ns.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100364187C (en) * | 2005-01-07 | 2008-01-23 | 清华大学 | Internal cavity electrically controlled wavelength code output method and biwavelength laser module thereof |
| CN100364186C (en) * | 2005-01-07 | 2008-01-23 | 清华大学 | External cavity electrically controlled laser wavelength code input method and biwavelength laser module thereof |
| CN102244358B (en) * | 2011-06-02 | 2013-02-27 | 天津奇谱光电技术有限公司 | External-cavity tunable laser |
| CN102244353B (en) * | 2011-06-09 | 2012-11-21 | 天津奇谱光电技术有限公司 | Tunable external cavity laser with light frequency interval of 25GHz |
| CN102299472B (en) * | 2011-07-12 | 2012-11-21 | 天津奇谱光电技术有限公司 | Light frequency precise tunable laser |
| CN103236641A (en) * | 2012-11-08 | 2013-08-07 | 国神光电科技（上海）有限公司 | Device and method for generating envelop-adjustable ultrashort pulse sequences |
| CN108306167B (en) * | 2018-01-22 | 2019-06-18 | 武汉安扬激光技术有限责任公司 | A kind of multichannel mode-locked all fibre resonant cavity |
| CN110943366B (en) * | 2019-05-09 | 2021-01-15 | 长春理工大学 | Dual-wavelength alternating Q-switching output group pulse laser and laser output method |
| CN110932074B (en) * | 2019-05-09 | 2021-04-13 | 长春理工大学 | Dual-wavelength laser cross frequency hopping and frequency modulation Q output laser and laser output method |
| CN111029893B (en) * | 2019-05-09 | 2021-01-15 | 长春理工大学 | Dual-wavelength alternate Q-switching single longitudinal mode output group pulse laser and laser output method |
| CN112290360A (en) * | 2020-10-28 | 2021-01-29 | 中国人民解放军陆军工程大学 | Dual-wavelength free control output laser |
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