CN204927799U - Long pulsed laser of high -energy obtains device - Google Patents
Long pulsed laser of high -energy obtains device Download PDFInfo
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- CN204927799U CN204927799U CN201520739080.2U CN201520739080U CN204927799U CN 204927799 U CN204927799 U CN 204927799U CN 201520739080 U CN201520739080 U CN 201520739080U CN 204927799 U CN204927799 U CN 204927799U
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Abstract
The utility model discloses a long pulsed laser of high -energy obtains device, direction according to laser transmission includes in proper order: continuous laser source, isolator, electric optic modem, polaroid and laser amplifier, the utility model discloses the tunable single frequency laser who uses continuous narrow linewidth is as planting a component, and the laser after amplifying still is tunable single -frequency narrow linewidth laser when having higher energy, and center wavelength is the same with the kind component, and the pulse width is determined by the modulating signal pulse width that the output pulse wave form is by the chronogenesis joint decision of modulating signal wave form, modulation laser pulse and amplifier stage pumping pulse, for the even wave form of sliding.
Description
Technical field
The utility model relates to all solid state laser field, in particular to a kind of high-energy Long Pulse LASER obtaining means.
Background technology
In the systems such as laser Sodium guide star, gravitational wave detection, laser radar, need tunable hundred Microsecond grade long pulse 1064nm laser, and laser linewidth, longitudinal mode are controlled.Meanwhile, for the ease of application, should try one's best even cunning, spectral line of laser pulse shape also should be stablized as far as possible.
The all solid state Long Pulse LASER of existing high-energy hundred Microsecond grade obtains mainly through the resonant cavity of quasi continuous diode laser pumping solid state gain medium, namely direct by vibration chamber acquisition pulse laser, and then paired pulses laser carries out energy expansion.But due to the relaxation oscillation characteristic that solid state laser gain medium is intrinsic, the Long Pulse LASER of output exists the relaxation spike that cannot eliminate, and this easily damages optical element in the application, or high-speed photodetector is made to be tending towards saturated and impact measurement.The existence of the spike of relaxation oscillation simultaneously, makes the difficulty controlling longitudinal mode strengthen, easily produces moding, is difficult to obtain the stable single mode narrow linewidth Laser output of spectral line.In addition, because the transmitted bandwidth of solid state gain medium near 1 μm only has tens GHz usually, therefore resonant cavity technology is difficult to obtain wider tuning range.
Utility model content
For above-mentioned problems of the prior art, the single-frequency Long Pulse LASER obtaining means that the utility model provides a kind of high-energy, narrow linewidth, tuning range wide.
For achieving the above object, the utility model provides following technical scheme:
A kind of high-energy Long Pulse LASER obtaining means, according to the direction of laser transmission, comprises: continuous laser source, isolator, electrooptic modulator, polarizer and laser amplifier successively.
Further, described continuous laser source is fiber laser or solid state laser.
Further, the isolation > 20dB of described isolator.
Further, described electrooptic modulator is connected with voltage source, modulation pulsewidth 100 μ s-2300 μ s.
Further, the laser reflectivity of described polarizer to s polarization is greater than 99%, is greater than 95% to the laser transmittance of p polarization.
Further, the laser reflectivity of described polarizer to p polarization is greater than 99%, is greater than 95% to the laser transmittance of s polarization.
Further, described device also comprises 1/2nd wave plates, and described 1/2nd wave plates are located between described electrooptic modulator and polarizer, and the optical axis direction of described 1/2nd wave plates and laser transmission direction are 90 °.
The beneficial effects of the utility model are as follows:
1, the utility model uses the tunable single frequency laser of continuous narrow linewidth as seed source, laser after amplification is while having higher-energy, be still tunable single mode narrow linewidth laser, centre wavelength is identical with seed source, pulsewidth is determined by modulation signal pulsewidth, output pulse waveform is determined jointly by the sequential of modulation signal waveform, modulated laser pulse and amplifying stage pumping pulse, is the waveform of even cunning;
2, high-energy Long Pulse LASER preparation method of the present utility model is different from the preparation method of prior art completely, eliminate Long Pulse LASER of the prior art and have that relaxation spike, tuning range are narrower, live width is difficult to control, the defect of spectral line instability, be obtain the effective way that high-energy high light beam quality single-frequency Long Pulse LASER exports.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model.
In figure: 1-continuous laser source, 2-isolator, 3-electrooptic modulator, 4-1/2nd wave plate, 5-polarizer, 6-laser amplifier.
Embodiment
The technical solution of the utility model is understood better in order to make those skilled in the art; below in conjunction with accompanying drawing of the present utility model; clear, complete description is carried out to the technical solution of the utility model; based on the embodiment in the application; other roughly the same embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of the application's protection.
Embodiment one:
As shown in Figure 1, a kind of high-energy Long Pulse LASER obtaining means, according to the direction of laser transmission, comprises successively: continuous laser source 1, isolator 2, electrooptic modulator 3,1/2nd wave plate 4, polarizer 5 and laser amplifier 6.
Continuous laser source 1 is fiber laser or solid state laser, and the laser of output is tunable continuous single-frequency laser, and polarization state is p polarization, and centre wavelength is tunable within the scope of 1064.5nm ± 1.0nm, and power output 100mW ~ 10W, live width is less than 100kHz.
Isolator 2 is the combination of optical crystal, wave plate and polarizer, to be that laser that continuous laser source 1 is exported is unidirectional pass through in effect, the backlight of the optical element after isolator 2 does not then return continuous laser source 1 by isolator 2, isolation > 20dB.
Electrooptic modulator 3 comprises 1 piece or 2 blocks of electrooptic crystals, modulation pulsewidth 100 μ s ~ 2300 μ s, work repetition rate 50Hz ~ 1000Hz, electrooptic crystal is driven by voltage source, voltage source is controlled by modulating signal source, exportable square wave, triangular wave, sine wave or any wave voltage; Not during load-modulate signal, polarization laser is not by changing polarization state after electrooptic crystal; When having load signal, polarization laser retrodeviates polarization state half-twist by electrooptic crystal.The continuous laser that continuous laser source exports is after electrooptic modulator 3, the polarization state of fraction of laser light deflects 90 °, namely fraction of laser light is s polarization state, another part laser is p polarization state, the laser of s polarization can be chosen as target laser, also can choose the laser of p polarization as target laser.
Polarizer 5 pairs of s light reflectivities are greater than 99%, are greater than 95% to p light transmission rate, and after polarizer 5, the s light in continuous laser is reflected, and only remaining p light, namely forms pulse laser.
/ 2nd wave plate 4 optical axis directions and optical direction are 90 °, are 45 ° with continuous laser source 1 polarization direction, make the laser polarization state half-twist by it.
When s polarization laser after elected electrooptic modulator 3 of learning from else's experience is as target laser, need before polarizer 5, add 1/2nd wave plates 4, so that the polarization state of target laser is become p polarization from s polarization; When p polarization laser after elected electrooptic modulator 3 of learning from else's experience is as target laser, then do not need to add 1/2nd wave plates 4 before polarizer 5.
Laser amplifier 6 is one-level or two-stage, and every first stage amplifier comprises the Nd:YAG module 2 of diode laser pump, bilateral amplification also can amplify by single-pass, realizes the function of paired pulses laser amplifier.
The utility model uses the tunable single frequency laser of continuous narrow linewidth as seed source, be different from the existing apparatus and method using pulse laser as seed source completely, laser after amplification is while having higher-energy, be still tunable single mode narrow linewidth laser, centre wavelength is identical with seed source, pulsewidth is determined by modulation signal pulsewidth, and output pulse waveform is determined jointly by the sequential of modulation signal waveform, modulated laser pulse and amplifying stage pumping pulse, is the waveform of even cunning.
Utilize above-mentioned obtaining means to obtain a method for high-energy Long Pulse LASER, comprise the following steps:
(1) continuous laser source 1 exports the seed laser of continuous print s polarization or p polarization, this seed laser continuously, single-frequency, narrow linewidth, tunable;
(2) seed laser is successively after isolator 2 and electrooptic modulator 3, because voltage source applies periodic pulse voltage to electrooptic modulator 3, polarization state generating period through the seed laser of electrooptic modulator 3 changes, and s polarization and p polarization interval exist, and obtain periodic laser;
(3) periodic laser is through polarizer 5, wherein a kind of laser light of polarization state, and the laser of another kind of polarization state is reflected, and obtains Long Pulse LASER, and pulse duration is 40 μ s-250 μ s;
(4) pulse laser that step (3) obtains carries out energy amplification through laser amplifier 6, obtain high-energy Long Pulse LASER, described high-energy refers to the energy higher than seed laser, and this kind of high-energy Long Pulse LASER is used for laser Sodium guide star, gravitational wave detection or laser radar.
High-energy Long Pulse LASER preparation method of the present utility model is different from the preparation method of prior art completely, eliminate Long Pulse LASER of the prior art and have that relaxation spike, tuning range are narrower, live width is difficult to control, the defect of spectral line instability, be obtain the effective way that high-energy high light beam quality single-frequency Long Pulse LASER exports.
Embodiment two:
Part identical with embodiment one in the present embodiment repeats no more, unlike: the polarization state of seed light is s polarization, and the laser reflectivity of polarizer 5 pairs of p polarizations is greater than 99%, is greater than 95% to the laser transmittance of s polarization.
When p polarization laser after elected electrooptic modulator 3 of learning from else's experience is as target laser, need before polarizer 5, add 1/2nd wave plates 4, so that the polarization state of target laser is become s polarization from p polarization; When s polarization laser after elected electrooptic modulator 3 of learning from else's experience is as target laser, then do not need to add 1/2nd wave plates 4 before polarizer 5.
Embodiment three:
Tunable single-frequency 1064nm continuous laser source 1 is the output of solid state laser space, and vacuum central wavelength is 1063.5nm, live width 5kHz, power output 100mW, and polarization state is s linearly polarized light, and spot diameter is Φ 1.0mm, beam quality M
2=1.02.
Monolithic LN crystal selected by electrooptic modulator 3, modulation voltage 1200V, and modulation pulsewidth 150 μ s, repetition rate 50Hz, modulation signal waveform is sinusoidal wave.
Do not use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of s polarization, is greater than 95% to the laser transmittance of p polarization.
Solid amplifier 6 is two-stage dual channel structure, and gain media is Nd:YAG rod, Pump duration 200 μ s, Laser output single pulse energy 200mJ, average power 10W, beam quality M after amplifying
2=1.2, live width 20kHz, spot diameter is Φ 3.5mm, pulse duration 110 μ s.
Embodiment four:
Tunable single-frequency 1064nm continuous laser source 1 is optical fiber output, and vacuum central wavelength is 1065.5nm, live width 10kHz, power output 2W, and polarization state is p polarised light, spot diameter Φ 2mm, beam quality M
2=1.05.
Single KD selected by electrooptic modulator 3
*p crystal, modulation voltage 6200V, modulation pulsewidth 220 μ s, repetition rate 100Hz, modulation waveform is triangular wave.
Do not use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of p polarization, is greater than 95% to the laser transmittance of s polarization.
Laser amplifier 6 is two-stage, and the first order is dual channel structure, and the second level is single-pass structure, and gain media is Nd:YAG rod, Pump duration 260 μ s, Laser output single pulse energy 400mJ, average power 40W, beam quality M after amplifying
2=1.3, live width 30kHz, spot diameter is Φ 6.0mm, pulse duration 150 μ s.
Embodiment five:
Tunable single-frequency 1064nm continuous laser source 1 is optical fiber output, and vacuum central wavelength is 1064nm, live width 70kHz, power output 5W, and polarization state is p polarised light, spot diameter Φ 2mm, beam quality M
2=1.1.
Two LN orthogonal crystals pressurization selected by electrooptic modulator 3, modulation voltage 260V, and modulation pulsewidth 250 μ s, repetition rate 200Hz, modulation waveform is square wave.
Use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of s polarization, is greater than 95% to the laser transmittance of p polarization.
Laser amplifier 6 is two-stage, and the first order is dual channel structure, and the second level is single-pass structure, and gain media is Nd:YAG rod, Pump duration 300 μ s, Laser output single pulse energy 800mJ, average power 160W, beam quality M after amplifying
2=1.8, live width 200kHz, spot diameter is Φ 10.0mm, pulse duration 180 μ s.
Embodiment six:
Tunable single-frequency 1064nm continuous laser source 1 is optical fiber output, and vacuum central wavelength is 1064.5nm, live width 100kHz, power output 10W, and polarization state is s polarised light, spot diameter Φ 3mm, beam quality M
2=1.1.
KD selected by electrooptic modulator 3
*p crystal, modulation voltage 6200V, modulation pulsewidth 100 μ s, repetition rate 500Hz, modulation waveform is triangular wave.
Use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of p polarization, is greater than 95% to the laser transmittance of s polarization.
Laser amplifier 6 is two-stage dual channel structure, and gain media is Nd:YAG rod, Pump duration 150 μ s, Laser output single pulse energy 500mJ, average power 250W, beam quality M after amplifying
2=1.6, live width 300kHz, spot diameter is Φ 6.0mm, pulse duration 70 μ s.
Embodiment seven:
Tunable single-frequency 1064nm continuous laser source 1 is optical fiber output, and vacuum central wavelength is 1063.5nm ~ 1065.5nm, live width 100kHz, power output 10W, and polarization state is p polarised light, spot diameter Φ 3mm, beam quality M
2=1.1.
KD selected by electrooptic modulator 3
*p crystal, modulation voltage 6200V, modulation pulsewidth 950 μ s, repetition rate 1000Hz, modulation waveform is square wave.
Do not use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of s polarization, is greater than 95% to the laser transmittance of p polarization.
Laser amplifier 6 is two-stage dual channel structure, and gain media is Nd:YAG rod, Pump duration 100 μ s, adjustment pump signal and modulation signal time delay, Laser output single pulse energy 300mJ, average power 300W, beam quality M after amplifying
2=1.5, live width 300kHz, spot diameter is Φ 6.0mm, pulse duration 40 μ s.
Embodiment eight:
Tunable single-frequency 1064nm continuous laser source 1 is the output of solid state laser space, and vacuum central wavelength is 1065nm, live width 10kHz, power output 600mW, and polarization state is s linearly polarized light, spot diameter Φ 2mm, beam quality M
2=1.1.
KD selected by electrooptic modulator 3
*p crystal, modulation voltage 6200V, modulation pulsewidth 2300 μ s, repetition rate 400Hz, modulation waveform is square wave.
Do not use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of p polarization, is greater than 95% to the laser transmittance of s polarization.
Laser amplifier 6 is two-stage dual channel structure, and gain media is Nd:YAG rod, Pump duration 250 μ s, adjustment pump signal and modulation signal time delay, Laser output single pulse energy 800mJ, average power 320W, beam quality M after amplifying
2=2.2, live width 300kHz, spot diameter is Φ 10.0mm, pulse duration 150 μ s.
Embodiment nine:
Tunable single-frequency 1064nm continuous laser source 1 is optical fiber output, and vacuum central wavelength is 1063.5nm, live width 100kHz, power output 10W, and polarization state is s linearly polarized light, spot diameter Φ 3mm, beam quality M
2=1.1.
KD selected by electrooptic modulator 3
*p crystal, modulation voltage 6200V, modulation pulsewidth 220 μ s, repetition rate 100Hz, modulation waveform is square wave.
Do not use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of s polarization, is greater than 95% to the laser transmittance of p polarization.
Laser amplifier 6 is two-stage dual channel structure, and gain media is Nd:YAG rod, Pump duration 270 μ s, Laser output single pulse energy 1.2J, average power 120W, beam quality M after amplifying
2=1.7, live width 300kHz, spot diameter is Φ 10.0mm, pulse duration 160 μ s.
Embodiment ten:
Tunable single-frequency 1064nm continuous laser source 1 is the output of solid state laser space, and live width 10kHz, vacuum central wavelength is 1063.5nm ~ 1065.5nm, power output 800mW, and polarization state is s linearly polarized light, spot diameter Φ 2mm, beam quality M
2=1.1.
KD selected by electrooptic modulator 3
*p crystal, modulation voltage 6200V, modulation pulsewidth 300 μ s, repetition rate 80Hz, modulation waveform is any wave function of editor.
Do not use 1/2nd wave plates 4, polarizer 5 is be greater than 99% to the laser reflectivity of s polarization, is greater than 95% to the laser transmittance of p polarization.
Laser amplifier 6 is one-level dual channel structure, and gain media is Nd:YAG rod, Pump duration 350 μ s, Laser output single pulse energy 300mJ, average power 24W, beam quality M after amplifying
2=1.4, live width 30kHz, spot diameter is Φ 4.0mm, pulse duration 250 μ s.
In order to make the abundant energy storage of gain media, Long Pulse LASER can fully extract its energy, Long Pulse LASER has a delay usually relative to pumping pulse, therefore the Long Pulse LASER width after amplifying generally is slightly less than initial modulation signal pulse, and the actual Long Pulse LASER width obtained needs measurement to obtain.
Prior art obtains pulse laser by resonant cavity, and paired pulses laser carries out amplifying rear use, and near this 1 μm, the tunable range of Long Pulse LASER is limited to solid dielectric gain bandwidth, and live width is generally less than 0.1nm.As shown in Figure 2, Fig. 2 is the hundred microsecond long pulses that quasi-cw pumping directly produces in resonant cavity, abscissa is time (50 μ s/div), and ordinate is voltage (20mV/div), because the lower meeting of gain causes the relaxation oscillation of hundred musec order.If increase pump power or pulse repetition frequency by improving, then thermal effect can be caused to increase, cause beam quality obviously to descend degradation problem.The pulse laser that Fig. 3 adopts the apparatus and method in the utility model to obtain, eliminates relaxation oscillation, and pulse shape can by modulator regulable control.As can be seen from embodiment three to ten, the pulse laser tunable range that pulse laser obtaining means of the present utility model obtains is wide, and the pulse laser obtained can reach hundreds of microsecond, line width, and beam quality is high, and energy is high.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (7)
1. a high-energy Long Pulse LASER obtaining means, is characterized in that, according to the direction of laser transmission, comprises successively: continuous laser source, isolator, electrooptic modulator, polarizer and laser amplifier.
2. high-energy Long Pulse LASER obtaining means according to claim 1, is characterized in that, described continuous laser source is fiber laser or solid state laser.
3. high-energy Long Pulse LASER obtaining means according to claim 2, is characterized in that, the isolation > 20dB of described isolator.
4. high-energy Long Pulse LASER obtaining means according to claim 3, it is characterized in that, described electrooptic modulator is connected with voltage source, modulation pulsewidth 100 μ s-2300 μ s.
5. high-energy Long Pulse LASER obtaining means according to claim 4, is characterized in that, the laser reflectivity of described polarizer to s polarization is greater than 99%, is greater than 95% to the laser transmittance of p polarization.
6. high-energy Long Pulse LASER obtaining means according to claim 4, is characterized in that, the laser reflectivity of described polarizer to p polarization is greater than 99%, is greater than 95% to the laser transmittance of s polarization.
7. according to the arbitrary described high-energy Long Pulse LASER obtaining means of claim 1-6, it is characterized in that, described device also comprises 1/2nd wave plates, described 1/2nd wave plates are located between described electrooptic modulator and polarizer, and the optical axis direction of described 1/2nd wave plates and laser transmission direction are 90 °.
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| CN201520739080.2U CN204927799U (en) | 2015-09-23 | 2015-09-23 | Long pulsed laser of high -energy obtains device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244747A (en) * | 2015-09-23 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | High-energy long pulse laser obtaining device, method and application |
| CN108092127A (en) * | 2016-11-17 | 2018-05-29 | 中国航空工业集团公司北京航空制造工程研究所 | One kind moves back the electric-optically Q-switched structure of pressure type and Q-regulating method |
| CN108526711A (en) * | 2018-03-29 | 2018-09-14 | 歌尔股份有限公司 | A method of improving the cutting of nanosecond pulse width ultraviolet laser |
| CN115693362A (en) * | 2023-01-04 | 2023-02-03 | 武汉锐科光纤激光技术股份有限公司 | Seed source of pulse laser and laser |
-
2015
- 2015-09-23 CN CN201520739080.2U patent/CN204927799U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244747A (en) * | 2015-09-23 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | High-energy long pulse laser obtaining device, method and application |
| CN108092127A (en) * | 2016-11-17 | 2018-05-29 | 中国航空工业集团公司北京航空制造工程研究所 | One kind moves back the electric-optically Q-switched structure of pressure type and Q-regulating method |
| CN108092127B (en) * | 2016-11-17 | 2020-09-08 | 中国航空制造技术研究院 | Voltage-reducing type electro-optical Q-switching structure and Q-switching method |
| CN108526711A (en) * | 2018-03-29 | 2018-09-14 | 歌尔股份有限公司 | A method of improving the cutting of nanosecond pulse width ultraviolet laser |
| CN108526711B (en) * | 2018-03-29 | 2020-01-10 | 歌尔股份有限公司 | Method for improving nanosecond pulse width ultraviolet laser cutting |
| CN115693362A (en) * | 2023-01-04 | 2023-02-03 | 武汉锐科光纤激光技术股份有限公司 | Seed source of pulse laser and laser |
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