CN201853942U - Electro-optic Q-switched solid-state laser with variable pulse width - Google Patents
Electro-optic Q-switched solid-state laser with variable pulse width Download PDFInfo
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- CN201853942U CN201853942U CN2010202456868U CN201020245686U CN201853942U CN 201853942 U CN201853942 U CN 201853942U CN 2010202456868 U CN2010202456868 U CN 2010202456868U CN 201020245686 U CN201020245686 U CN 201020245686U CN 201853942 U CN201853942 U CN 201853942U
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Abstract
The utility model relates to an electro-optic Q-switched solid-state laser with high recurrence frequency and variable pulse width. The laser is provided with a laser resonant cavity which is composed of an output mirror, a laser medium and a totally reflecting mirror, wherein a polaroid and an electro-optic Q-switched crystal are arranged between the laser medium and the totally reflecting mirror in sequence. A high-frequency Q-switched power supply with variable pulse width is connected with the electro-optic Q-switched crystal to supply a high-pressure pulse driving signal, high pressure applied to the electro-optic Q-switched crystal is quickly turned off to improve loss in the resonant cavity, laser oscillation is cut off in advance, and therefore the output pulse width of the solid-state laser is compressed. The output pulse width of the electro-optic Q-switched solid-state laser can be from 2.5ns to basic pulse width. If an LD (Laser Diode) side pump module is used, the basic pulse width is 30ns or so, during pulse output, the pulse width is stable and smooth, and the quality of laser beam is good.
Description
Technical field
The utility model relates to a kind of solid state laser, especially a kind of high repetition frequency, the electric-optically Q-switched solid state laser of pulse width variability.
Background technology
In the later stage eighties 20th century, along with the important breakthrough of crystalline material and laser diode techniques, solid state laser is developed rapidly, and its application is constantly expanded.It is little that all solid state laser of laser diode (LD) pumping has a volume, the conversion efficiency height, and good beam quality, advantage such as stability is high, and the life-span is long is widely used in Materialbearbeitung mit Laserlicht, laser medicine, military confrontation, undersea detection, fields such as laser display.
Transferring Q is the compression output pulse width, improves the peak power of output laser, exports the main means of different repetition rate laser pulses.Mainly contain electric-optically Q-switchedly in the prior art, passive Q-adjusted and acousto-optic Q modulation etc. are transferred the Q mode.Wherein passive Q-adjusted stability is lower, and the output single pulse energy is lower, can't accurately control the laser output pulse width.Though the acousto-optic Q modulation repetition rate is higher, switching speed is slow, the output pulse width broad, generally all above 100ns, peak power can only reach tens KW even tens KW, can't satisfy laser processing, the needs of using with low pulsewidth, and compression pulse width accurately.Electric-optically Q-switched repetition rate height can reach 1000HZ, stable performance, and switching speed is fast, can realize the narrow pulse width laser pulse output about 30ns, and peak power reaches more than the 100KW.Therefore electric-optically Q-switched is the narrow pulsewidth of output accent Q mode commonly used.But the pulsewidth of general electric-optically Q-switched laser output is about 30ns.And in laser acquisition and laser display, the low more display precision of laser pulse pulsewidth is high more.The following laser pulse of 20ns will improve the precision of laser acquisition and laser display.It is variable that market in urgent need obtains a kind of laser output pulse width, and further compress the laser output pulse width, realize being lower than 30ns, even the solid state laser of several ns.Therefore how to realize that the laser output pulse width is adjustable, compression laser output pulse width becomes urgent problem.
The utility model content
The utility model purpose is to overcome the deficiencies in the prior art, and a kind of high repetition frequency is provided, the electric-optically Q-switched solid state laser of pulse width variability.This solid state laser pulsewidth can be from 2.5ns to basic pulsewidth (as using the LD side pump module, basic pulsewidth probably is 30ns), and output burst length pulsewidth is stable, and is level and smooth, good beam quality.
Technical scheme of the present invention is: a kind of high repetition frequency, the electric-optically Q-switched solid state laser of pulse width variability, it is characterized in that: constitute laserresonator by outgoing mirror, laser medium and total reflective mirror, along the optical axis of described laserresonator, between described laser medium and described total reflective mirror, place polarizer and electric-optically Q-switched crystal successively; The high frequency Q switching power supply that pulse duration is adjustable connects described electric-optically Q-switched crystal so that the high-voltage pulse drive signal to be provided.
Laser works principle of the present invention is as follows: adopt the mode of optical pumping to store the energy in the laser medium (for example Nd:YAG crystal), the Q value that reduces in the resonant cavity promptly increases cavity loss, thereby stops the generation of laser generation.When the upper laser level inverted population is accumulated to optimum value in a large number, return to high Q value suddenly, energy storage just discharges with very short light pulse like this.Wherein be that laser pulse width, single pulse energy are usually only long with resonant cavity under no external interference factor affecting release time, energy storage intensity in the chamber, to open time of turn-offing resonant cavity, cavity loss etc. relevant.This laser is regulated cavity loss by human factor in the giant pulse forming process, thereby reaches the purpose that changes the giant pulse laser pulse width.The adjusting of cavity loss is by regulating the mode of high-voltage pulse drive signal pulsewidth, promptly adopt the mode of turn-offing electric-optically Q-switched crystal high pressure fast to improve cavity loss, in advance by laser generation, reaching the purpose that slicing reduces output pulse width.Concrete: constitute laserresonator by outgoing mirror, laser medium and total reflective mirror, polarizer provides polarised light for electric-optically Q-switched crystal as the polarizer, the high frequency Q switching power supply that pulse duration is adjustable connects described electric-optically Q-switched crystal provides the high-voltage pulse drive signal, by regulating high-voltage pulse drive signal impulse width, by laser generation, adjust output pulse pulsewidth, and compression laser output pulse pulsewidth.
The described laser medium of pump light source profile pump.This pump light source is that pulse duration is adjustable, the quasi-cw pumping light source.The pulse pulsewidth of described pump light source output is adjustable, can improve pulse pumping peak power like this, reduces thermal effect, thereby optimizes the resonant cavity output beam quality.
Between described laser medium and described total reflective mirror, also have λ/4 wave plates.Described λ/4 wave plates comprise a λ/4 wave plates and the 2nd λ/4 wave plates; A described λ/4 wave plates are between described polarizer and described electric-optically Q-switched crystal; Described the 2nd λ/4 wave plates are between described electric-optically Q-switched crystal and described total reflective mirror.
Described laser medium is neodymium-doped yttrium-aluminum garnet crystal (Nd:YAG), or Nd-doped yttrium vanadate crystal (Nd:YVO
4).
Described polarizer becomes Brewster's angle with described optical axis.
Described electric-optically Q-switched crystal is potassium dihydrogen phosphate (KDP) or potassium dideuterium phosphate (KD*P).
The beneficial effects of the utility model are:
1, adopt the adjustable adjustable high-voltage pulse drive signal of high frequency Q switching power supply output pulse width of pulsewidth to control the opening and closing of electric-optically Q-switched crystal, the laser pulse output pulse width is accurately controlled, can press narrow laser output pulse width.And the high-voltage pulse drive signal has guaranteed effectively that less than rising edge and/or the trailing edge of 3ns accent Q opens the turn-off time, thereby reaches the optimum operation effect when turning on and off.For example in the LD side pumping module, be basic pulsewidth if define the laser pulse width that common high-voltage pulse drive signal exported, this basic pulsewidth is about 30ns; Use the adjustable high frequency Q switching power supply output high-voltage pulse drive signal of pulsewidth, output pulse width is minimum can be compressed into 2.5ns.
2, between laser medium and total reflective mirror, place λ/4 wave plates, described λ/4 wave plates make the polarised light phase shift pi/2 of process, the polarised light depolarization phenomenon that the thermal birefringence effect that compensation at high temperature produces owing to laser medium causes, the power output of raising solid state laser.
3, laser crystal uses laser medium to be the neodymium-doped yttrium-aluminum garnet crystal, or the Nd-doped yttrium vanadate crystal, and fluorescence lifetime is short, is fit to the high-repetition-rate running.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified;
Fig. 1 is the electric-optically Q-switched solid state laser of the utility model pulse width variability.
Fig. 2 is the high-voltage pulse drive signal of high frequency Q switching power supply output.
1. outgoing mirrors among the figure, 2. laser medium, 3. pump light source, 4. polarizer, a 5. λ/4 wave plates, 6. electric-optically Q-switched crystal, 7. high frequency Q switching power supply, 8. the 2nd λ/4 wave plates, 9. total reflective mirror.
Embodiment
Below in conjunction with accompanying drawing 1,2 and embodiment the utility model is described further.As shown in Figure 1, a kind of high repetition frequency in the utility model, the electric-optically Q-switched solid state laser of pulse width variability, comprise the laserresonator that is constituted by outgoing mirror 1, laser medium 2 and total reflective mirror 9, wherein along the optical axis of described laserresonator, place polarizer 4 and electric-optically Q-switched crystal 6 between laser medium 2 and total reflective mirror 9 successively, high frequency Q switching power supply 7 is the Switching Power Supplies that pulsewidth is adjustable, connects electric-optically Q-switched crystal 6 so that the high-voltage pulse drive signal to be provided.Pump light source 3 is quasi-cw pumping light sources, in the mode of quasi-cw pumping pump light is injected laser medium 2 in the mode of profile pump by optical coupling system, and the pulse pulsewidth of described pump light source output is adjustable.This Switching Power Supply 7 can provide the high-voltage pulse drive signal synchronously with pump light source, and this drive signal can be regulated electric-optically Q-switched crystal 6 high tension voltage amplitude, high-voltage pulse width simultaneously.When pump light stores the energy in (for example Nd:YAG crystal) in the laser medium, reduce the Q value in the resonant cavity, thereby also promptly increase the generation that cavity loss stops laser generation, when the upper laser level inverted population is accumulated to optimum value in a large number, suddenly return to high Q value, energy storage just discharges with very short light pulse like this.Wherein also be that laser pulse width, single pulse energy are usually only long with resonant cavity under no external interference factor affecting release time, energy storage intensity in the chamber, to open time of turn-offing resonant cavity, cavity loss etc. relevant.This solid state laser medium-high frequency Q switching power pulse width-adjustable in the giant pulse forming process, adopts the mode of turn-offing electric-optically Q-switched crystal high pressure fast to improve cavity loss, in advance by laser generation, reaches the purpose that slicing reduces the giant pulse pulsewidth.
Because laser medium 2 at high temperature thermal birefringence effect can take place, the polarised light that forms by polarizer 4 changes by laser medium 2 polarization states, can export from axle by polarizer 4 once more, thereby increase cavity loss.Can in the chamber, insert λ/4 wave plates to reduce depolarization phenomenon in the chamber.In one embodiment, λ/4 wave plates comprise a λ/4 wave plates and the 2nd λ/4 wave plates.The one λ/4 wave plates are between polarizer 4 and electric-optically Q-switched crystal 6, and the 2nd λ/4 wave plates are between electric-optically Q-switched crystal 6 and total reflective mirror 9.Laser medium can be neodymium-doped yttrium-aluminum garnet crystal (Nd:YAG), or Nd-doped yttrium vanadate crystal (Nd:YVO
4).Polarizer 4 becomes Brewster's angle with the resonant cavity optical axis.Electric-optically Q-switched crystal is potassium dihydrogen phosphate crystal (KDP) or potassium dideuterium phosphate crystal (KD*P).
In a preferred embodiment: it is 1000W that pump light source adopts peak power, pulsewidth is that the laser diode (LD) of 200 μ s carries out quasi-cw pumping, laser medium is the Nd:YAG pole, doping content is 0.4%, specifically be of a size of 3mm*75mm, electric-optically Q-switched crystal is potassium dideuterium phosphate crystal (KD*P).High frequency Q switching power supply 7 is the adjustable Switching Power Supply of pulse duration, and high repetition frequency is 1000Hz.As shown in Figure 2, high-voltage pulse drive signal voltage is 4500V, and pulsewidth is 63ns, and 201.3 μ s delay time.Polarizer 4 becomes Brewster's angle with optical axis, places a λ/4 wave plates 5 between polarizer 4 and KD*P, places the 2nd λ/4 wave plates 8 between KD*P and total reflective mirror.Total reflective mirror plating 9 plating wavelength are 1064 films that are all-trans, and outgoing mirror 1 plating 1064nm partly sees through film.Laser output wavelength 1064nm, pulse ceiling capacity 3.4mj@10ns, pulsewidth adjustable extent 6-20ns, single pulse energy stability≤2%rms, repetition rate is 250Hz, 500Hz or 1000Hz, output facula diameter 3mm, pulsewidth is dithered as ± 1ns, the angle of divergence≤2mrad.
Electric-optically Q-switched solid state laser of the present utility model can effectively compress laser output pulse, realizes that the output pulse is adjustable, and the accuracy height, and good beam quality is with a wide range of applications in laser acquisition, laser display.
Claims (7)
1. the electric-optically Q-switched solid state laser of a high repetition frequency, pulse width variability, it is characterized in that: comprise the laserresonator that constitutes by outgoing mirror, laser medium and total reflective mirror, wherein along the optical axis of described laserresonator, place polarizer and electric-optically Q-switched crystal between described laser medium and described total reflective mirror successively, the high frequency Q switching power supply that pulse duration is adjustable connects described electric-optically Q-switched crystal so that the high-voltage pulse drive signal to be provided.
2. electric-optically Q-switched solid state laser according to claim 1 is characterized in that: the described laser medium of pump light source ambient light pumping, this pump light source are that pulse duration is adjustable, the quasi-cw pumping light source.
3. electric-optically Q-switched solid state laser according to claim 1 is characterized in that: also have λ/4 wave plates between laser medium and total reflective mirror.
4. electric-optically Q-switched solid state laser according to claim 4 is characterized in that: described λ/4 wave plates comprise a λ/4 wave plates and the 2nd λ/4 wave plates; A described λ/4 wave plates are between described polarizer and described electric-optically Q-switched crystal; Described the 2nd λ/4 wave plates are between described electric-optically Q-switched crystal and described total reflective mirror.
5. electric-optically Q-switched solid state laser according to claim 1 is characterized in that: described laser medium is the neodymium-doped yttrium-aluminum garnet crystal, or the Nd-doped yttrium vanadate crystal.
6. electric-optically Q-switched solid state laser according to claim 1 is characterized in that: described polarizer becomes Brewster's angle with described optical axis.
7. electric-optically Q-switched solid state laser according to claim 1 is characterized in that: described electric-optically Q-switched crystal is potassium dihydrogen phosphate or potassium dideuterium phosphate.
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| CN102496847A (en) * | 2011-11-29 | 2012-06-13 | 桂林星辰科技有限公司 | Multi-lamp single-rod solid laser and using method thereof |
| CN104269729A (en) * | 2014-09-10 | 2015-01-07 | 北京光电技术研究所 | Electro-optic Q-switch pulse laser with controllable single-pulse beam splitting ratio |
| CN105680315A (en) * | 2016-04-14 | 2016-06-15 | 北京工业大学 | Method for increasing average output power of electro-optic Q-switched laser |
| CN106025783A (en) * | 2016-06-06 | 2016-10-12 | 中国工程物理研究院应用电子学研究所 | Q-switched pulse laser for quickly switching polarization states |
| CN107994457A (en) * | 2017-12-29 | 2018-05-04 | 成都心无界光电技术有限公司 | A kind of electric-optically Q-switched solid state laser |
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| CN102496847B (en) * | 2011-11-29 | 2014-03-26 | 桂林星辰科技有限公司 | Multi-lamp single-rod solid laser and using method thereof |
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| CN104269729A (en) * | 2014-09-10 | 2015-01-07 | 北京光电技术研究所 | Electro-optic Q-switch pulse laser with controllable single-pulse beam splitting ratio |
| CN104269729B (en) * | 2014-09-10 | 2017-02-15 | 北京光电技术研究所 | Electro-optic Q-switch pulse laser with controllable single-pulse beam splitting ratio |
| CN105680315A (en) * | 2016-04-14 | 2016-06-15 | 北京工业大学 | Method for increasing average output power of electro-optic Q-switched laser |
| CN106025783A (en) * | 2016-06-06 | 2016-10-12 | 中国工程物理研究院应用电子学研究所 | Q-switched pulse laser for quickly switching polarization states |
| CN107994457A (en) * | 2017-12-29 | 2018-05-04 | 成都心无界光电技术有限公司 | A kind of electric-optically Q-switched solid state laser |
| CN108767639B (en) * | 2018-05-23 | 2020-01-07 | 吉林省科英激光股份有限公司 | Laser capable of outputting single longitudinal mode laser beam and light emitting control method thereof |
| CN108767639A (en) * | 2018-05-23 | 2018-11-06 | 吉林省科英激光股份有限公司 | A kind of laser of exportable single longitudinal mode laser beam and its go out light control method |
| CN108767634A (en) * | 2018-08-24 | 2018-11-06 | 南京罗默激光科技有限公司 | A kind of subnanosecond green (light) laser |
| CN109512576A (en) * | 2018-11-20 | 2019-03-26 | 吉林省科英激光股份有限公司 | Electro-optical Q-switch Frequency-doubled-double pulse laser rubble system |
| CN109512576B (en) * | 2018-11-20 | 2019-12-13 | 吉林省科英激光股份有限公司 | Electro-optical Q switch double-frequency double-pulse laser stone crushing system |
| US11364078B2 (en) | 2018-11-20 | 2022-06-21 | Jilin Province King Laser Co., Ltd. | Electro-optic Q-switching double-frequency double-pulse laser lithotripsy system |
| CN109462138A (en) * | 2018-12-03 | 2019-03-12 | 南京罗默激光科技有限公司 | A kind of Gao Zhongying short pulse infrared laser |
| CN110011177A (en) * | 2019-03-21 | 2019-07-12 | 北京遥测技术研究所 | A kind of electric light Radial Birefringent Q-switch |
| CN110011177B (en) * | 2019-03-21 | 2020-06-09 | 北京遥测技术研究所 | Electro-optical radial birefringence Q-switch |
| CN112271543A (en) * | 2020-09-29 | 2021-01-26 | 北京卓镭激光技术有限公司 | Active Q-switched laser and pulse width modulation method thereof |
| CN113471803A (en) * | 2021-07-02 | 2021-10-01 | 中国科学院半导体研究所 | Pulse output adjustable acousto-optic Q-switched solid laser and pulse laser generation method |
| CN113471803B (en) * | 2021-07-02 | 2023-12-26 | 中国科学院半导体研究所 | Pulse output adjustable acousto-optic Q-switched solid laser and pulse laser generation method |
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Granted publication date: 20110601 Termination date: 20130702 |