CN102208745A - Miniaturized passive Q-switching eye-safe Raman laser - Google Patents
Miniaturized passive Q-switching eye-safe Raman laser Download PDFInfo
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- CN102208745A CN102208745A CN 201110108338 CN201110108338A CN102208745A CN 102208745 A CN102208745 A CN 102208745A CN 201110108338 CN201110108338 CN 201110108338 CN 201110108338 A CN201110108338 A CN 201110108338A CN 102208745 A CN102208745 A CN 102208745A
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Abstract
The invention discloses a miniaturized passive Q-switching eye-safe Raman laser, which belongs to the field of solid lasers. The miniaturized passive Q-switching eye-safe Raman laser comprises a pumping source, a coupling lens system, a laser crystal, a Raman crystal, a passive Q-switching crystal, a rear cavity mirror and an output mirror, and is characterized in that: the pumping source is positioned in front of the coupling lens system; a resonant cavity consisting of the rear cavity mirror and the output mirror is formed behind the coupling lens system; the laser crystal, the Raman crystal and the passive Q-switching crystal are sequentially arranged in the resonant cavity; and the laser crystal and the Raman crystal are wrapped by an indium foil respectively, fixed in a copper block with a water cooling or semiconductor refrigeration device and subjected to the thermostatic control of the refrigeration device. The miniaturized passive Q-switching eye-safe Raman laser generates fundamental frequency light by utilizing the laser diode (LD) end pumped laser crystal, generates a column of giant pulses by utilizing the passive Q-switching crystal to achieve peak power required by Raman conversion, converts the fundamental frequency light into Raman light by the Raman crystal, and outputs the Raman light in an eye-safe waveband. The miniaturized passive Q-switching eye-safe Raman laser the advantages of small volume, stable performance, high power, low cost and the like, and is highly practical.
Description
Technical field
The present invention relates to a kind of solid state laser, particularly a kind of 1.5 microns passive Q-adjusted human eye safe Raman lasers of miniaturization.
Background technology
At present both at home and abroad relevant for the report of solid eye-safe laser, they mainly take three kinds of modes to realize: the bait amorphous laser of first LD pumping (Spectral and temporal properties ofdiode-pumped Er, Yb:glasslaser, " Optics Communications ", Vol.252,2005,301-306); Its two be the mode of taking parametric oscillator (High-repetition-rate, intracavity-pumped KTP OPO at 1572nm, " Applied Physics B ", Vol.80,2005,329-332); It three is to utilize stimulated Raman scattering (Compact efficient all-solid-state eye-safe laserwith self-frequency Raman conversion in a Nd:YVO
4Crystal, " Optics Letters ", Vol.29,2004,2171-2174).Wherein, Er amorphous laser material difficulty, the low thermal conductance coefficient restriction repetition rate of host glass material is not suitable for frequency applications; And stimulated Raman scattering belongs to the third-order non-linear effect, and (OPO) compares with parametric oscillation, and it need not phase matched, and its output beam quality is good, and the transformation efficiency height can be worked under higher repetitive frequency.Therefore in recent years, utilizing the mode of stimulated Raman scattering to obtain the output of 1.5 μ m human eye safe waveband laser is subjected to people and more and more pays close attention to.Utilizing stimulated Raman scattering (SRS) to obtain the output of 1.5 μ m eye-safe laser needs fundamental frequency light to have high peak power to reach the SRS threshold value, therefore fundamental frequency light has all adopted pulsed light in the present existing bibliographical information, and be adopt acousto-optic or electric light initiatively transfer the Q structure.Though initiatively transfer the Q structure can obtain stable pulse output, obtain the required higher peak power of stimulated Raman scattering, but one side structure more complicated, the introducing of acousto-optic or electro-optical device has increased the length of resonant cavity, thereby makes resonator design difficulty more; Acousto-optic and electro-optical device itself cost an arm and a leg and need independent power drives on the other hand, have increased the cost of laser, and have made the laser heaviness, are unfavorable for practical application.
Summary of the invention
For overcoming the defective of prior art, little with the realization volume, the power height, conversion efficiency height and compact conformation, the eye-safe laser of function-stable the invention provides the passive Q-adjusted human eye safe Raman laser of a kind of miniaturization.
Technical scheme of the present invention is as follows:
The passive Q-adjusted human eye safe Raman laser of a kind of miniaturization, comprise pumping source, coupled lens system, laser crystal, Raman crystal, passive Q-adjusted crystal, Effect of Back-Cavity Mirror and outgoing mirror, it is characterized in that pumping source is positioned at before the coupled lens system, place the resonant cavity of forming by Effect of Back-Cavity Mirror and outgoing mirror after the coupled lens system; Place laser crystal, Raman crystal and passive Q-adjusted crystal in the resonant cavity successively; Laser crystal, Raman crystal wrap up and are fixed in the copper billet that has water-cooled or semiconductor cooling device by indium foil, by refrigerating plant it are carried out thermostatic control;
Wherein pumping source is that output wavelength is the laser diode of the optical fiber coupling output of 808nm or 880nm, and pump mode is an end pumping; It is 1064nm that two end faces of laser crystal all are coated with wavelength, and the anti-reflection film of 1300-1550nm, front end face add the anti-reflection film of plating to 808nm and 880nm; The Raman crystal both ends of the surface are all plated the anti-reflection film of 1300-1550nm; It is the anti-reflection film of 1300-1550nm that passive Q-adjusted crystal two ends are coated with wavelength; Effect of Back-Cavity Mirror is coated with to the high transmittance film of wavelength 808nm, 880nm and 1064nm with to the high-reflecting film of wavelength 1300-1550nm; Outgoing mirror is coated with the high transmittance film of wavelength 1064nm and is the transmission film of 2%-50% to the high-reflecting film of wavelength 1300-1350nm, to the 1500-1550nm light transmission rate; Its reflectivity of above-mentioned high-reflecting film all is not less than 99.9%.
Described laser crystal is a kind of yttrium-aluminium-garnet (YAG), the vanadic acid yttrium (YVO in neodymium-doped (Nd) or the following all crystal of mixing ytterbium (Yb)
4), vanadic acid gadolinium (GdVO
4), vanadic acid lutetium (LuVO
4), lithium yttrium fluoride (YLF), yttrium aluminate (YAP), Gd-Ga garnet (GGG), wolframic acid gadolinium potassium (KGd (WO
4)
2); Or bonding crystal yttrium-aluminium-garnet/neodymium-doped yttrium-aluminum garnet (YAG/Nd:YAG), vanadic acid yttrium/Nd-doped yttrium vanadate (YVO
4/ Nd:YVO
4) a kind of in all crystal; Or neodymium-doped (Nd) or mix the YAG pottery of ytterbium (Yb); The doping content of laser crystal is 0.05-at.% to 3-at.% when neodymium-doped; When mixing ytterbium 0.05-at.% to 10-at.%.The laser crystal effect is to produce the required fundamental frequency light of Raman conversion.
Described Raman crystal is YVO
4, GdVO
4, SrWO
4, BaWO
4, KGd (WO
4)
2A kind of in the crystal, the Raman crystal effect is the laser of 1.3 microns fundamental frequency phototransformation to 1.5 micron human eye safe waveband that laser crystal is produced.
Described passive Q-adjusted crystal is V:YAG, Co:MgAl
2O
4(Co:MALO) a kind of in the crystal, passive Q-adjusted crystal effect is to produce a row giant pulse, to reach the required peak power of Raman conversion.
Described Effect of Back-Cavity Mirror and outgoing mirror can be a kind of of level crossing, concave mirror or convex mirror.
Above-mentioned laser crystal and Raman crystal can be same crystal, promptly are fixed as the YVO that is doped with neodymium ion that a-cuts
4Crystal or bonding crystal YVO
4-Nd:YVO
4Or YVO
4-Nd:YVO
4-YVO
4, the doping content of neodymium is 0.05-at.% to 3-at.%.
Above-mentioned cooling system has dual mode: the recirculated water cooling---crystal on side face all encases with the metal derby that has pipeline, continues to be connected with recirculated cooling water in the pipeline of metal derby, is used for reducing temperature to crystal; Semiconductor refrigerating---crystal on side face is surrounded by the semiconductor refrigerating piece.
The radius of curvature of Effect of Back-Cavity Mirror and outgoing mirror can be selected according to actual conditions.The length of all crystals among the present invention all can be chosen according to specific requirement; The face area of crystal can be determined according to the area of resonant cavity inner laser beam sizes.
The workflow of laser is as follows: the wavelength that laser diode LD sends is that the pump light of 808nm or 880nm enters gain medium after optical fiber coupled lens system and Effect of Back-Cavity Mirror, and the fundamental frequency light of generation 1.3m, fundamental frequency light produces a row giant pulse through passive Q-adjusted crystal, giant pulse has high peak power, can reach the Raman switching threshold, giant pulse is converted to Raman light through three rank Stokes effects of Raman crystal, and is exported by outgoing mirror.
The present invention proposes the passive Q-adjusted 1.5 μ m eye-safe full-solid state Raman laser designs of a kind of novel miniaturization, compact conformation, high conversion efficiency.The volume of laser head of the present invention is 10 * 10 * 20cm
3About, specific volume is little mutually with laser in the background information, and cost is low, and efficient height, light-light conversion efficiency can reach more than 6%, and power output can reach 1W, and stable performance.
Description of drawings
Fig. 1 is the structural representation of laser of the present invention.
Wherein: 1. pumping source, 2. optical fiber, 3. coupled lens system, 4. Effect of Back-Cavity Mirror, 5. laser crystal, 6. Raman crystal, 7. passive Q-adjusted crystal, 8. outgoing mirror.
Embodiment
Embodiment 1:
The embodiment of the invention 1 as shown in Figure 1, comprise pumping source 1, optical fiber 2, coupled lens system 3, laser crystal 5, Raman crystal 6, passive Q-adjusted crystal 7, Effect of Back-Cavity Mirror 4 and outgoing mirror 8, it is characterized in that pumping source 1 is positioned at before the coupled lens system 3, place the resonant cavity of forming by Effect of Back-Cavity Mirror 4 and outgoing mirror 8 after the coupled lens system 3; Place laser crystal 5, Raman crystal 6 and passive Q-adjusted crystal 7 in the resonant cavity successively; Laser crystal 5, Raman crystal 6 wrap up and are fixed in the copper billet that has water cooling plant by indium foil, by refrigerating plant it are carried out thermostatic control, and its temperature remains on 20 ℃ in lasing whole process;
Wherein pumping source 1 is that output wavelength is the laser diode of the optical fiber coupling output of 808nm, and pump mode is an end pumping; It is 1064nm that 5 two end faces of laser crystal all are coated with wavelength, and the anti-reflection film of 1300-1550nm, front end face add the anti-reflection film of plating to 808nm; Raman crystal 6 both ends of the surface are all plated the anti-reflection film of 1300-1550nm; It is the anti-reflection film of 1300-1550nm that passive Q-adjusted crystal 7 two ends are coated with wavelength; The radius of curvature of Effect of Back-Cavity Mirror 4 is 1000mm, is coated with wavelength 808nm, and the high transmittance film of 1064nm and to the high-reflecting film of wavelength 1300-1500nm, it is 99.9% to 1319nm and 1503nm reflectivity; Outgoing mirror 8 is coated with the high transmittance film to wavelength 1064nm, and to the high-reflecting film of wavelength 1319nm, its reflectivity is 99.9%, and its transmitance to wavelength 1503nm is 8%.
Described laser crystal 5 is Nd:YAG crystal, and the Nd:YAG crystal is as laser medium, and effect is to produce the required fundamental frequency light of Raman conversion, and the Nd ion doping concentration of Nd:YAG crystal 5 is 0.8%, and length is 6mm.
Described Raman crystal 6 is BaWO
4Crystal, BaWO
4Crystal is as the Raman medium, with the laser of 1.3 microns fundamental frequency phototransformation to 1.5 micron human eye safe wavebands.
Described passive Q-adjusted crystal 7 is V:YAG crystal, and the V:YAG crystal uses as passive Q-adjusted switch, and effect is to produce a row giant pulse, changes required peak power to reach Raman.
The workflow of laser is as follows: the wavelength that laser diode LD pumping source 1 sends is that the pump light of 808nm enters Nd:YAG laser crystal 5 after optical fiber 2 and coupled lens system 3 and Effect of Back-Cavity Mirror 4, and the fundamental frequency light of generation 1319nm, fundamental frequency light produces a row giant pulse through passive Q-adjusted crystal 7, giant pulse has high peak power, can reach the Raman switching threshold, giant pulse is converted to Raman light through three rank Stokes effects of Raman crystal 6, and by outgoing mirror 8 outputs.
Embodiment 2:
Identical with embodiment 1, be described laser diode LD pumping source 1 for 880nm laser diode, laser crystal 5 and Raman crystal 6 by same Nd:YVO
4Crystal 5 is realized.The radius of curvature of described Effect of Back-Cavity Mirror 4 is 500mm; Described Effect of Back-Cavity Mirror 4 and outgoing mirror 7 all are coated with the high transmittance film to 1064nm, and Effect of Back-Cavity Mirror 4 is plated the high transmittance film to 880nm simultaneously, and plate 1342nm and 1525nm high-reflecting film, and it is 99.9% to 1342nm and 1525nm reflectivity; Described outgoing mirror 8 is coated with to the 1064nm high transmittance film with to 1342nm high-reflecting film (reflectivity is 99.9%), and is 10% to the 1525nm transmitance; Described Nd:YVO
4The doping content of crystal 5 is 0.4%, and length is 15mm, and it is 1064nm that its end face all is coated with wavelength, and the anti-reflection film of 1300-1550nm, front end face add the anti-reflection film of plating to 880nm.
The workflow of laser is as follows: the wavelength that laser diode LD pumping source 1 sends is that the pump light of 880nm enters Nd:YVO after optical fiber 2 and coupled lens system 3 and Effect of Back-Cavity Mirror 4
4 Laser crystal 5, and the fundamental frequency light of generation 1342nm, fundamental frequency light produces a row giant pulse through passive Q-adjusted crystal 7, giant pulse has high peak power, can reach the Raman switching threshold, giant pulse is converted to Raman light through three rank Stokes effects of Raman crystal 6, and by outgoing mirror 8 outputs.
Embodiment 3:
Identical with embodiment 2, be described Nd:YVO
4Crystal 5 is by bonding crystal YVO
4-Nd:YVO
4-YVO
4Realize.Described bonding crystal YVO
4-Nd:YVO
4-YVO
4Be of a size of 3 * 3 * (2+8+15); Nd
3+Doping content is 0.6%, and its front end face adds the anti-reflection film of plating to 880nm.
The workflow of laser is as follows: the wavelength that laser diode LD pumping source 1 sends is that the pump light of 880nm enters YVO after optical fiber 2 and coupled lens system 3 and Effect of Back-Cavity Mirror 4
4-Nd:YVO
4-YVO
4The bonding crystal 5, and the fundamental frequency light of generation 1342nm, fundamental frequency light produces a row giant pulse through passive Q-adjusted crystal 7, and giant pulse has high peak power, can reach the Raman switching threshold, giant pulse is converted to Raman light and by outgoing mirror 8 outputs through three rank Stokes effects of Raman crystal 6.。
The core diameter of the optical fiber 2 among above-mentioned three embodiment is 400 μ m, and numerical aperture is 0.22, and maximum power output is 32W.Outgoing mirror 8 is flat mirror.And all crystals all has water cooling plant to guarantee that temperature remains on 20 ℃ in the experimentation.
Claims (5)
1. passive Q-adjusted human eye safe Raman laser of miniaturization, comprise pumping source, coupled lens system, laser crystal, Raman crystal, passive Q-adjusted crystal, Effect of Back-Cavity Mirror and outgoing mirror, it is characterized in that pumping source is positioned at before the coupled lens system, place the resonant cavity of forming by Effect of Back-Cavity Mirror and outgoing mirror after the coupled lens system; Place laser crystal, Raman crystal and passive Q-adjusted crystal in the resonant cavity successively; Laser crystal, Raman crystal wrap up and are fixed in the copper billet that has water-cooled or semiconductor cooling device by indium foil, by refrigerating plant it are carried out thermostatic control;
Wherein pumping source is that output wavelength is the laser diode of the optical fiber coupling output of 808nm or 880nm, and pump mode is an end pumping; It is 1064nm that two end faces of laser crystal all are coated with wavelength, and the anti-reflection film of 1300-1550nm, front end face add the anti-reflection film of plating to 808nm and 880nm; The Raman crystal both ends of the surface are all plated the anti-reflection film of 1300-1550nm; It is the anti-reflection film of 1300-1550nm that passive Q-adjusted crystal two ends are coated with wavelength; Effect of Back-Cavity Mirror is coated with to the high transmittance film of wavelength 808nm, 880nm and 1064nm with to the high-reflecting film of wavelength 1300-1550nm; Outgoing mirror is coated with the high transmittance film of wavelength 1064nm and is 2%-50% to the high-reflecting film of wavelength 1300-1350nm, to the 1500-1550nm light transmission rate; Its reflectivity of above-mentioned high-reflecting film all is not less than 99.9%.
2. the passive Q-adjusted human eye safe Raman laser of a kind of miniaturization as claimed in claim 1 is characterized in that described laser crystal is a kind of in neodymium-doped or the following all crystal of mixing ytterbium: yttrium-aluminium-garnet, vanadic acid yttrium, vanadic acid gadolinium, vanadic acid lutetium, lithium yttrium fluoride, yttrium aluminate, Gd-Ga garnet, wolframic acid gadolinium potassium; Or a kind of in the bonding crystal yttrium-aluminium-garnet/neodymium-doped yttrium-aluminum garnet, all crystal of vanadic acid yttrium/Nd-doped yttrium vanadate; Or neodymium-doped or mix the YAG pottery of ytterbium; The doping content of laser crystal is 0.05-at.% to 3-at.% when neodymium-doped; When mixing ytterbium 0.05-at.% to 10-at.%.The laser crystal effect is to produce the required fundamental frequency light of Raman conversion.
3. the passive Q-adjusted human eye safe Raman laser of a kind of miniaturization as claimed in claim 1 is characterized in that described Raman crystal is YVO
4, GdVO
4, SrWO
4, BaWO
4, KGd (WO
4)
2A kind of in the crystal, the Raman crystal effect is the laser of 1.3 microns fundamental frequency phototransformation to 1.5 micron human eye safe waveband that laser crystal is produced.
4. the passive Q-adjusted human eye safe Raman laser of a kind of miniaturization as claimed in claim 1 is characterized in that described passive Q-adjusted crystal is V:YAG, Co:MgAl
2O
4(Co:MALO) a kind of in the crystal, passive Q-adjusted crystal effect is to produce a row giant pulse, to reach the required peak power of Raman conversion.
5. the passive Q-adjusted human eye safe Raman laser of a kind of miniaturization as claimed in claim 1 is characterized in that described Effect of Back-Cavity Mirror and outgoing mirror can be a kind of of level crossing, concave mirror or convex mirror.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594910A (en) * | 2013-11-28 | 2014-02-19 | 长春理工大学 | Solid laser for end face pumping through annular light |
| CN104181545A (en) * | 2014-07-09 | 2014-12-03 | 山东大学 | Coaxial aerosol laser radar system of human-eye safe wavelength |
| CN105048275A (en) * | 2015-08-25 | 2015-11-11 | 湖北捷讯光电有限公司 | Solid-state laser of human eye safety output |
| CN105140775A (en) * | 2015-07-16 | 2015-12-09 | 山东大学 | 1.2 micron wavelength all-solid-state Raman laser |
| CN105489690A (en) * | 2015-12-01 | 2016-04-13 | 天津英利新能源有限公司 | Cooling assembly and cooling photovoltaic system |
| CN106058632A (en) * | 2016-07-15 | 2016-10-26 | 暨南大学 | Pulse-energy-adjustable passive Q-switched Raman laser system based on bonding crystals |
| CN113270785A (en) * | 2021-05-18 | 2021-08-17 | 扬州大学 | Continuous wave 1.5 mu m human eye safety all-solid-state self-Raman laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101276984A (en) * | 2008-05-13 | 2008-10-01 | 福州高意通讯有限公司 | Micro-chip laser with safety laser pulse output to human eye |
| CN201234055Y (en) * | 2008-06-30 | 2009-05-06 | 山东大学 | Coupling cavity type Raman frequency doubling completely solid yellow light laser |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101276984A (en) * | 2008-05-13 | 2008-10-01 | 福州高意通讯有限公司 | Micro-chip laser with safety laser pulse output to human eye |
| CN201234055Y (en) * | 2008-06-30 | 2009-05-06 | 山东大学 | Coupling cavity type Raman frequency doubling completely solid yellow light laser |
Non-Patent Citations (2)
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| 《光子学报》 20100228 张真等 AlGaInAs 半导体饱和吸收体调Q特性的理论与实验研究 193-196 1-5 第39卷, 第2期 * |
| 《光学学报》 20101031 李平等 激光二极管抽运主动调Q陶瓷Nd：YAG 1319 nm 激光器特性研究 2963-2966 1-5 第30卷, 第10期 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594910A (en) * | 2013-11-28 | 2014-02-19 | 长春理工大学 | Solid laser for end face pumping through annular light |
| CN104181545A (en) * | 2014-07-09 | 2014-12-03 | 山东大学 | Coaxial aerosol laser radar system of human-eye safe wavelength |
| CN105140775A (en) * | 2015-07-16 | 2015-12-09 | 山东大学 | 1.2 micron wavelength all-solid-state Raman laser |
| CN105048275A (en) * | 2015-08-25 | 2015-11-11 | 湖北捷讯光电有限公司 | Solid-state laser of human eye safety output |
| CN105489690A (en) * | 2015-12-01 | 2016-04-13 | 天津英利新能源有限公司 | Cooling assembly and cooling photovoltaic system |
| CN106058632A (en) * | 2016-07-15 | 2016-10-26 | 暨南大学 | Pulse-energy-adjustable passive Q-switched Raman laser system based on bonding crystals |
| CN113270785A (en) * | 2021-05-18 | 2021-08-17 | 扬州大学 | Continuous wave 1.5 mu m human eye safety all-solid-state self-Raman laser |
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Application publication date: 20111005 |