CN104795717A - Blue-green band pulse all-solid-state laser - Google Patents
Blue-green band pulse all-solid-state laser Download PDFInfo
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Abstract
A blue-green band pulse all-solid-state laser mainly comprises a single-frequency 1.06-micrometer pulse laser, an optical parametric oscillation amplifier, a frequency doubling module, a triple-frequency module and a control circuit. The blue-green band pulse all-solid-state laser has the advantages of simple and compact structure, narrow linewidth and high stability and pulse energy. The transmission wave band of the laser belongs to solar spectrum Frauenhofer darkline (518.36 nm), and the laser stays in an ocean blue-green window and is applicable to the underwater communication system.
Description
Technical field
The present invention relates to bluish-green laser device, particularly a kind of bluish-green band pulse all solid state laser.
Background technology
At present, the research work carrying out 516-519nm band pulse laser technology is in the world relatively less, and its technology path mainly concentrates on following three kinds:
1) semiconductor laser based on gallium nitride (GaN) matrix directly exports, and wave-length coverage is at 510 ~ 520nm, but such laser output peak power is difficult to effective lifting;
2) mixing and doping (Er is adopted
3+, Yb
3+) bulk and fiber gain media, obtain certain peak power 1554nm wavelength fundamental frequency in conjunction with main oscillations-amplification (MOPA) technology to export, then adopt frequency multiplication, frequency tripling technology to obtain 518nm wavelength to export, it is low that this scheme obtains pulse energy, is only μ J magnitude;
3) with high energy 355nm UV laser pulses for pumping source, pumping OPO technology realizes the tunable output of 410nm ~ 2400nm wave band, this technology path can obtain high pulse energy 518nm Laser output, but its fatal weakness makes pumping source with the macro-energy 355nm UV laser pulses of high power density, very easily cause optic element damage, especially optical thin film.How improving the narrow linewidth of this bluish-green band pulse laser, high pulse energy exports, and obtain application, is current research difficult point.And increasingly mature along with pure-tone pulse 1.06 μm of laser technologies, and the development of high-quality nonlinear crystal, makes to realize narrow linewidth (~ 10MHz), the bluish-green band pulse laser of high-energy (~ mJ magnitude) becomes possibility.
Summary of the invention
The object of the invention is to overcome existing 516 ~ 519nm pulse laser and export the not high shortcoming of energy, a kind of 516 ~ 519nm pulse all solid state laser is provided, exports with the narrow-linewidth laser pulse obtaining high pulse energy.
Technical solution of the present invention is as follows:
A kind of bluish-green band pulse all solid state laser, is characterized in that its structure comprises single-frequency 1.06 μm of pulse lasers, optical parametric oscillator-amplifier, two times of frequency modules, frequency tripling module and control circuit five parts:
Described single-frequency 1.06 μm of pulse lasers are successively by 1.06 μm of pure-tone pulse oscillators, isolator, coupled lens, the first row twt amplifier, first compensating glass assembly, beam splitter, first beam-expanding system, second travelling-wave amplifier and the second compensating glass assembly composition, described beam splitter and light path setting at 45 °, 1.06 μm of described pure-tone pulse oscillators are injection seeded single-frequency 1.06 μm of pulse lasers, the laser that this laser exports is through described isolator, coupled lens injects the first row twt amplifier, folded light beam and transmitted light beam is divided into through the first compensating glass assembly by described beam splitter after the first row twt amplifier amplifies, this transmitted light beam continues to promote pulse energy through the first beam-expanding system and the second travelling-wave amplifier, the second pump coupling light is exported by the second compensating glass assembly, described folded light beam is as the first pump coupling light,
Described optical parametric oscillator-amplifier is made up of optical parametric oscillator and optical parametric amplifier, formation comprises: along the first pump coupling optical path direction focus lamp successively, first speculum and energy adjustable attenuator, resonance front cavity mirror, first parametric crystals, second parametric crystals, resonance Effect of Back-Cavity Mirror, second beam-expanding system, / 1st wave plate, light combination mirror, tri-consult volume crystal, 4th parametric crystals, angled mirrors group successively along the second pump coupling light direction, second speculum, 3rd beam-expanding system, / 2nd wave plate and described light combination mirror, the first described speculum, second speculum and light path are all at 45 °, the laser amplified is by the output of the 4th described parametric crystals, wavelength is 1.55 μm, for follow-up times of frequency module provides first-harmonic,
The formation of two times of described frequency modules, the output light path direction of propagation along the 4th described parametric crystals is made up of the first spectroscope, contracting beam system, the 1/3rd wave plate and two frequency-doubling crystals, the first described spectroscope and light path at 45 °;
The formation of described frequency tripling module, the output light path direction of propagation along two described frequency-doubling crystals is made up of special wave plate, frequency tripling crystal and the second spectroscope, described special wave plate is full-wave plate to described first-harmonic, be half-wave plate to two frequency doubled lights, the second described spectroscope and light path at 45 °, frequency tripling light is separated by it, obtains bluish-green band pulse Laser output;
Described control circuit is by the first drive circuit module, second drive circuit module, 3rd drive circuit module, pure-tone pulse control module and time-sequence control module are formed, the first described drive circuit connects the drive end of described pure-tone pulse oscillator, the control end of the pure-tone pulse oscillator described in output termination of described pure-tone pulse control module, the second described drive circuit is connected with the drive end of the second travelling-wave amplifier with described the first row twt amplifier respectively with the 3rd drive circuit, the output of described time-sequence control module respectively with the first described drive circuit, second drive circuit, 3rd drive circuit is connected with the sequencing control end of pure-tone pulse control module,
Described front cavity mirror is coated with 1.55 mu m waveband high-reflecting films and the anti-reflection film to 1.06 μm of pump lights;
Described Effect of Back-Cavity Mirror be coated with to 1.55 μm have 30% ~ 50% transmitance and to 1.06 μm of pump light high transmittance films;
Described light combination mirror is coated with the high transmittance film of 1.55 μm of parameteric lights and the high-reflecting film to 1.06 μm of pump lights;
Described parametric crystals is the arsenic acid titanyl potassium crystal (KTiOAsO of critical cutting
4, KTA);
Two described frequency-doubling crystals and frequency tripling crystal are the BBO Crystal (β-barium borate, β-BBO) of I type-Ⅱphase matching;
Described special wave plate is full-wave plate to described 1.55 μm of first-harmonics, is half-wave plate to 0.77 μm of two frequency multiplication ripple, and first-harmonic and 0 °, two frequency multiplication ripples are incident in this wave plate, rotates the phase-matching condition that this special wave plate can meet efficient frequency tripling;
1.06 μm of described pure-tone pulse oscillators are the electric-optically Q-switched Nd:YAG pulse lasers of Nd:YAG pulse laser or injection seeded single-frequency;
Described condenser lens converts pump beam, and the resonance hot spot that its spot size in resonant cavity and resonant cavity are produced is in the same size;
Described isolator ensures the one-way transmission of light path, in order to avoid the reverse laser spilt from amplifier enters oscillator and affects its output characteristic;
/ 2nd described wave plates, its effect incident ray polarized light is adjusted to the polarization state meeting condition subsequent;
Described pure-tone pulse control module, its effect realizes single mode narrow linewidth pulse laser to export, details consult " Conductively cooled 250-Hz single frequencyNd:YAG laser, " Chin Opt Lett 8,670-672 (2010) such as document Wang Jun great waves.
A kind of 516 ~ 519nm pulse all solid state laser based on nonlinear optical conversion technology, utilize the pure-tone pulse Nd:YAG monofier of technical maturity, the conversion of pumping laser to flashlight is realized in optical parameter technology, then using flashlight as first-harmonic, utilize frequency doubling technology to realize second harmonic to export, finally utilize frequency tripling technology to realize 516 ~ 519nm wavelength laser and export.Due to single-frequency 1.06 μm of laser single-pulse energies high (~ 800mJ), bigbore nonlinear crystal has high damage threshold, the bluish-green band pulse laser described in the present invention, is expected to realize narrow linewidth, high-energy exports.
The present invention compared with prior art has the following advantages:
1. utilize single-frequency nanosecond pulse Nd:YAG laser as pumping source, narrow-linewidth single frequency pulse laser can be obtained.
2. utilize the Pulse Nd of nearly joule magnitude: YAG laser, in conjunction with high damage threshold crystal, high-octane 516 ~ 519nm pulse laser that can obtain mJ magnitude exports.
3.516 ~ 519nm laser belongs to the not bright Hough concealed wire (518.36nm) of solar spectrum, is in again ocean blue-green window, is applicable to underwater communications system.
4. high-octane 516 ~ 519nm pulse laser, can realize remote subsurface communication.
Accompanying drawing explanation
Fig. 1 is the optical system principle schematic of the bluish-green band pulse all solid state laser of the present invention;
Fig. 2 is the structured flowchart of the bluish-green band pulse all solid state laser of the present invention;
Fig. 3 is two frequencys multiplication of the bluish-green band pulse all solid state laser of the present invention, the phase matched mode schematic diagram of frequency tripling.
Embodiment
Below in conjunction with accompanying drawing, technical solution of the present invention is described further, but should limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the optical system principle schematic of the bluish-green band pulse all solid state laser of the present invention.As shown in Figure 1, the present invention's bluish-green band pulse all solid state laser optical system comprises single-frequency 1.06 μm of pulse lasers 1, optical parametric oscillation amplifier 2, two times of frequency modules 3 and frequency tripling module 4 four part, the laser that pure-tone pulse laser 1 exports enters optical parametric oscillation amplifier 2, optical parametric oscillation amplifier 2 Output of laser enters two times of frequency modules 3 and frequency tripling module 4 successively, in optical parametric oscillation amplifier, 1.06 μm of laser are converted to flashlight 1.55 μm output, as the first-harmonic of cavity external frequency multiplication, afterwards first through two frequency-doubling crystals, part of fundamental light transfers two frequency doubled lights of 0.77 μm to, again together with residue fundamental frequency light, by frequency tripling crystal, obtain the bluish-green band pulse laser of 516 ~ 519nm.
Fig. 2 is the structured flowchart of the bluish-green band pulse all solid state laser of the present invention, and as seen from the figure, structure of the present invention comprises single-frequency 1.06 μm of pulse lasers 1, optical parametric oscillator-amplifier 2, two times of frequency modules 3, frequency tripling module 4 and control circuit 5 five part:
Described single-frequency 1.06 μm of pulse lasers 1, Laser output direction along this pulse oscillator 1-1 is isolator 1-2, coupled lens 1-3, the first row twt amplifier 1-4, the first compensating glass assembly 1-5, beam splitter 1-6, first beam-expanding system 1-7, the second travelling-wave amplifier 1-8 at 45 ° with light path successively, and the second compensating glass assembly 1-9;
Described optical parametric oscillator-amplifier 2 comprises the focus lamp 2-1 in the first pump coupling light path, first speculum 2-2, energy adjustable attenuator 2-3, resonance front cavity mirror 2-4, first parametric crystals 2-5, second parametric crystals 2-6, resonance Effect of Back-Cavity Mirror 2-7, second beam-expanding system 2-8, / 1st wave plate 2-9, light combination mirror 2-15 at 45 ° with light path, tri-consult volume crystal 2-16, 4th parametric crystals 2-17, angled mirrors group 2-10 and 2-11 successively along the second pump coupling light direction, second speculum 2-12, 3rd beam-expanding system 2-13, / 2nd wave plate 2-14 and described light combination mirror 2-15, the first described speculum, second speculum and light path are all at 45 °, the laser amplified is by the output of the 4th described parametric crystals 2-17,
3rd beam-expanding system 2-8, the 1/2nd wave plate 2-9, and two pieces of parametric crystals 2-16 and 2-17 walked from compensating placement in its subsequent optical path, the light path between described front cavity mirror 2-4 and Effect of Back-Cavity Mirror 2-7 is provided with two pieces and walks from compensating parametric crystals 2-5 and 2-6 placed;
Two times of described frequency modules 3 comprise the first spectroscope 3-1 at 45 ° with light path, along optical propagation direction having beam-shrinked mirror assembly 3-2, the 1/3rd wave plate 3-3, two frequency-doubling crystal 3-4;
Described frequency tripling module 4 comprises special wave plate 4-1, frequency tripling crystal 4-2 and the second spectroscope 4-3 at 45 ° with light path;
Described control circuit 5, comprise the first described drive circuit module 5-1, second drive circuit module 5-3, 3rd drive circuit module 5-4, pure-tone pulse control module 5-2 and sequencing control mould 5-5 block are formed, the output of described pure-tone pulse control module 5-2 is all connected with the input of described pure-tone pulse oscillator 1-1 with the output of the first drive circuit module 5-1, the output of the second described drive circuit module 5-3 is connected with the input of described the first row twt amplifier 1-3, the output of the 3rd described drive circuit module 5-4 is connected with the input of the second described travelling-wave amplifier 1-8, the output of described time-sequence control module 5-5 and the input of described pure-tone pulse control module 5-2, the input of the first drive circuit module 5-1, the input of the second drive circuit module 5-3, the input of the 3rd drive circuit module 5-4 is connected, as shown in Figure 2,
Described bluish-green band pulse all solid state laser, it is characterized in that pumping laser is 1.06 μm of lasers, optical parameter mechanism output wavelength is 1.55 μm, and parametric crystals is the critical cutting arsenic acid titanyl potassium crystal (KTiOAsO of II type-Ⅱphase matching
4, KTA), described front cavity mirror is coated with 1.06 μm of anti-reflection films and to 1.55 μm of high-reflecting films, Effect of Back-Cavity Mirror has pumping laser 1.06 μm of anti-reflection films and to the transmitance of 1.55 μm 30% ~ 50%, described light combination mirror is coated with the anti-reflection film of 1.55 μm of parameteric lights and the high-reflecting film to 1.06 μm of pump lights, two times of frequency module Output of laser wavelength are 0.77 μm, frequency-doubling crystal is the BBO Crystal (β-barium borate of I type-Ⅱphase matching, β-BBO), frequency tripling module Output of laser wavelength is 516 ~ 519 μm, frequency tripling crystal is the BBO Crystal (β-barium borate of I type-Ⅱphase matching, β-BBO), two frequencys multiplication, phase matched mode in frequency tripling module as shown in Figure 3,
Described condenser lens converts pump beam, and the resonance hot spot that its spot size in resonant cavity and resonant cavity are produced is in the same size;
Described isolator ensures the one-way transmission of light path, in order to avoid the reverse laser spilt from amplifier enters oscillator and affects its output characteristic;
/ 2nd described wave plates, its effect incident ray polarized light is adjusted to the polarization state meeting condition subsequent;
Described special wave plate is full-wave plate to described first-harmonic, is half-wave plate to two frequency multiplication ripples, rotates the phase-matching condition that this special wave plate can meet efficient frequency tripling;
The bluish-green band pulse all solid state laser of described one, is characterized in that 1.06 μm of described pure-tone pulse oscillators are the electric-optically Q-switched Nd:YAG pulse lasers of Nd:YAG pulse laser or injection seeded single-frequency.
Should illustrate, foregoing, only for technical conceive of the present invention and feature are described, its object is to understand content of the present invention for those skilled in the art and provide embodiment, can not limit the scope of the invention with this.All technical schemes according to the present invention are modified or equivalent replacement, and do not depart from aim and the scope of technical solution of the present invention, and it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a bluish-green band pulse all solid state laser, it is characterized in that, comprise single-frequency 1.06 μm of pulse lasers (1), optical parametric oscillator-amplifier (2), two times of frequency modules (3), frequency tripling module (4) and control circuit (5) five parts:
Described single-frequency 1.06 μm of pulse lasers (1) comprise 1.06 μm of pure-tone pulse oscillators (1-1), isolator (1-2), coupled lens (1-3), the first row twt amplifier (1-4), the first compensating glass assembly (1-5), beam splitter (1-6), the first beam-expanding system (1-7), the second travelling-wave amplifier (1-8) and the second compensating glass assembly (1-9);
The laser direction exported along described 1.06 μm of pure-tone pulse oscillators (1-1) is described isolator (1-2) successively, coupled lens (1-3), the first row twt amplifier (1-4), first compensating glass assembly (1-5) and with the beam splitter (1-6) described in the placement at 45 ° of this light path, light beam is divided into folded light beam and transmitted light beam by this beam splitter (1-6), this transmitted light beam is successively through described the first beam-expanding system (1-7), second travelling-wave amplifier (1-8) and the second compensating glass assembly (1-9) export the second pump coupling light afterwards, described folded light beam is as the first pump coupling light,
Described optical parametric oscillator-amplifier (2) comprises the focus lamp (2-1) placed successively along the first pump coupling optical path direction, first speculum (2-2), energy adjustable attenuator (2-3), resonance front cavity mirror (2-4), first parametric crystals (2-5), second parametric crystals (2-6), resonance Effect of Back-Cavity Mirror (2-7), second beam-expanding system (2-8), / 1st wave plate (2-9) and light combination mirror (2-15), along the angled mirrors group (2-10 that the second pump coupling light direction is placed successively, 2-11), second speculum (2-12), 3rd beam-expanding system (2-13), / 2nd wave plate (2-14) and described light combination mirror (2-15), described the first speculum (2-2), second speculum (2-12) and light combination mirror (2-15) and light path placement at 45 °, the parameteric light that described resonance Effect of Back-Cavity Mirror (2-7) exports by described light combination mirror (2-15) and the second pump coupling photosynthetic and after, export after tri-consult volume crystal (2-16) and the 4th parametric crystals (2-17) successively, this parameteric light provides first-harmonic for follow-up times of frequency module,
The output light path direction of propagation along the 4th parametric crystals (2-17) is two times of frequency modules (3) described in the first spectroscope (3-1), contracting beam system (3-2), the 1/3rd wave plate (3-3) and two frequency-doubling crystals (3-4) are formed successively, and described the first spectroscope (3-1) is at 45 ° with this output light path;
The output light path direction of propagation along described two frequency-doubling crystals (3-4) is the formation of the frequency tripling module (4) described in special wave plate (4-1), frequency tripling crystal (4-2) and the second spectroscope (4-3) are formed successively, described the second spectroscope (4-3) is at 45 ° with light path, frequency tripling light is separated by it, obtains bluish-green band pulse Laser output;
Described control circuit (5) comprises the first drive circuit module (5-1), second drive circuit module (5-3), 3rd drive circuit module (5-4), pure-tone pulse control module (5-2) and time-sequence control module (5-5), described the first drive circuit (5-1) connects the drive end of described pure-tone pulse oscillator (1-1), the control end of the pure-tone pulse oscillator (1-1) described in output termination of described pure-tone pulse control module (5-2), described the second drive circuit (5-3) is connected with the drive end of the second travelling-wave amplifier (1-8) with the drive end of described the first row twt amplifier (1-4) respectively with the 3rd drive circuit (5-4), the output of described time-sequence control module (5-5) respectively with described the first drive circuit (5-1), second drive circuit (5-3), 3rd drive circuit (5-4) is connected with the sequencing control end of pure-tone pulse control module (5-2).
2. bluish-green band pulse all solid state laser according to claim 1, is characterized in that described resonance front cavity mirror (2-4) is coated with 1.55 mu m waveband high-reflecting films and the anti-reflection film to 1.06 μm of pump lights.
3. bluish-green band pulse all solid state laser according to claim 1, is characterized in that described resonance Effect of Back-Cavity Mirror (2-7) is coated with the transmitance of 1.55 μm 30% ~ 50% and the high transmittance film to 1.06 μm of pump lights.
4. bluish-green band pulse all solid state laser according to claim 1, is characterized in that described light combination mirror (2-15) is coated with the high transmittance film of 1.55 μm of parameteric lights and the high-reflecting film to 1.06 μm of pump lights.
5. bluish-green band pulse all solid state laser according to claim 1, is characterized in that the arsenic acid titanyl potassium crystal (KTiOAsO that described parametric crystals (2-5,2-6,2-16 and 2-17) is critical cutting
4, KTA), two frequency-doubling crystals (3-4) and frequency tripling crystal (4-2) are the BBO Crystal (β-barium borate, β-BBO) of I type-Ⅱphase matching.
6. bluish-green band pulse all solid state laser according to claim 1, it is characterized in that described special wave plate (4-1) is full-wave plate to described 1.55 μm of first-harmonics, be half-wave plate to 0.77 μm of two frequency doubled light, rotate the phase-matching condition that this special wave plate can meet efficient frequency tripling.
7. bluish-green band pulse all solid state laser according to claim 1, is characterized in that 1.06 μm of described pure-tone pulse oscillators (1-1) are the electric-optically Q-switched Nd:YAG pulse lasers of Nd:YAG pulse laser or injection seeded single-frequency.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968313A (en) * | 2017-12-15 | 2018-04-27 | 中国科学院上海光学精密机械研究所 | Multi-wavelength narrow linewidth all solid state laser for marine exploration |
| CN110456381A (en) * | 2019-07-08 | 2019-11-15 | 中国科学院国家空间科学中心 | A kind of laser radar of all solid state metallic atom and ion Layer Detection |
| CN111106518A (en) * | 2019-12-13 | 2020-05-05 | 北京遥测技术研究所 | Joule-level three-wavelength tunable single-frequency pulse laser |
| CN113540946A (en) * | 2021-07-05 | 2021-10-22 | 苏州英谷激光有限公司 | Laser capable of switching three wavelengths |
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| CN204271441U (en) * | 2014-12-19 | 2015-04-15 | 武汉楚天工业激光设备有限公司 | Solid RGB laser |
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| JPH02239238A (en) * | 1989-01-13 | 1990-09-21 | Internatl Business Mach Corp <Ibm> | Apparatus for generating coherent bluish green light radiation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107968313A (en) * | 2017-12-15 | 2018-04-27 | 中国科学院上海光学精密机械研究所 | Multi-wavelength narrow linewidth all solid state laser for marine exploration |
| CN110456381A (en) * | 2019-07-08 | 2019-11-15 | 中国科学院国家空间科学中心 | A kind of laser radar of all solid state metallic atom and ion Layer Detection |
| CN110456381B (en) * | 2019-07-08 | 2022-01-25 | 中国科学院国家空间科学中心 | Laser radar for detecting all-solid-state metal atom and ion layer |
| CN111106518A (en) * | 2019-12-13 | 2020-05-05 | 北京遥测技术研究所 | Joule-level three-wavelength tunable single-frequency pulse laser |
| CN113540946A (en) * | 2021-07-05 | 2021-10-22 | 苏州英谷激光有限公司 | Laser capable of switching three wavelengths |
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