CN103414095A - Laser-gathering cavity for solid laser - Google Patents
Laser-gathering cavity for solid laser Download PDFInfo
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- CN103414095A CN103414095A CN2013103318473A CN201310331847A CN103414095A CN 103414095 A CN103414095 A CN 103414095A CN 2013103318473 A CN2013103318473 A CN 2013103318473A CN 201310331847 A CN201310331847 A CN 201310331847A CN 103414095 A CN103414095 A CN 103414095A
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Abstract
The invention provides a laser-gathering cavity for a solid laser, belongs to the technical field of solid lasers, and relates to improvement on a laser-gathering cavity of an existing high-power lamp pumped solid laser. The laser-gathering cavity comprises a quartz rod (1), and a pumping lamp installation hole and a laser rod installation hole are formed in the inner portion of the quartz rod (1). The laser-gathering cavity is characterized in that a laser-gathering reflection coating is plated on the outer surface, except two end faces, of the quartz rod (1), and the laser-gathering reflection coating is divided into three layers which contain a diffuse reflection coating body (2), a silicon dioxide film (3) and a metallic reflection film (4) from inside to outside. According to the laser-gathering cavity for the solid laser, the reflection coating is high in reflectivity and small in thickness, so that the size of the laser-gathering cavity is reduced greatly; the diffuse reflection coating body is strong in high-temperature resistance and even in reflection; the laser-gathering cavity is simple in structure, convenient to process and strong in impact vibration resistance.
Description
Technical field
The invention belongs to the Solid State Laser technical field, relate to the improvement to existing high power lamp light-pumped solid state laser laser pump cavity.
Background technology
For high-power solid state laser, pump power is higher, heat accumulation in operation material is larger, the inhomogeneous thermal lens caused of operation material variations in temperature, thermally induced birefringence and hot focus make the light beam passed through distorted, cause beam quality to descend, when serious, will cause the damage of operation material or other optical element, cause the collapse of system.Therefore there are contradiction in high power output and high light beam quality, and high power output can cause the decline of beam quality on the one hand; Will improve on the other hand the output energy must take high light beam quality and be basis.Solve the method for this contradiction, improve on the one hand pumping efficiency and uniformity, the appropriate design cooling circuit reduces the generation of heat distortion, by optical means, the heat distortion produced is compensated on the other hand.For the high power lamp light-pumped solid state laser, the generation that reduces the heat distortion mainly designs realization by laser pump cavity, and laser pump cavity has two important function, and first, the light of pumping lamp radiation as far as possible efficiently and is equably converged on laser bar; The second, the cooling duct of laser bar and pumping lamp is provided, by cooling fluid, heat efficiently and is equably taken out of and dissipated.Pumping and cooling uniformity have determined the gross efficiency of laser system and the beam quality of output beam to a great extent.Current a kind of high power lamp light-pumped solid state laser laser pump cavity is referring to Chinese patent application " diffuse reflecting pump cavity " (200510029674.5), by a quartz pushrod, formed, a pumping lamp installing hole is arranged in quartz pushrod inside, the pumping lamp installing hole connects two end faces of quartz pushrod, at the inner laser bar installing hole in addition of quartz pushrod, the laser bar installing hole connects two end faces of quartz pushrod, and the axis of pumping lamp installing hole is parallel with the axis of laser bar installing hole.In the outside of quartz pushrod, also have a quartz ampoule, in the toroidal cavity between quartz pushrod and quartz ampoule, filling polytetrafluorethylepowder powder, MgO powder or BiSO
4Powder is as diffuse reflector.Its shortcoming is: the first, the reflectivity of diffuse reflector is low, and thickness must be greater than 4mm usually, causes the laser pump cavity volume ratio larger; The second, the resistance to elevated temperatures of diffuse reflector is poor, causes reflectivity to descend, and reflects inhomogeneous; Three, complex structure, processing difficulties; Four, the ability of impact resisting vibrating.
Summary of the invention
The objective of the invention is: propose that a kind of reflectivity is high, resistance to elevated temperatures and the impact resisting vibrating performance laser pump cavity for solid state laser strong, simple in structure, easy to process.
Technical scheme of the present invention is: a kind of laser pump cavity for high power solid state laser, comprise a quartz pushrod 1, in quartz pushrod 1 inside, a pumping lamp installing hole is arranged, the pumping lamp installing hole connects two end faces of quartz pushrod 1, at the inner laser bar installing hole in addition of quartz pushrod 1, the laser bar installing hole connects two end faces of quartz pushrod 1, and the axis of pumping lamp installing hole is parallel with the axis of laser bar installing hole; It is characterized in that: at quartz pushrod 1, remove on the outer surface of two end faces and be coated with the optically focused reflectance coating, the optically focused reflectance coating is divided into three layers, is respectively from inside to outside: diffuse reflection coating 2, silicon dioxide film 3 and metallic reflective coating 4; Diffuse reflection coating 2 is BiSO
4Coating or MgO coating or polytetrafluorethylecoatings coatings, thickness are 0.1mm～1mm; The thickness of silicon dioxide film 3 is 5 μ m～500 μ m; Metallic reflective coating 4 is aluminium film, silverskin or golden film, and the thickness of metallic reflective coating [4] is 50 μ m～500 μ m.
Advantage of the present invention is: the first, the reflectivity in reflector is high, and thickness is little, and the laser pump cavity volume is dwindled greatly; The second, the resistance to elevated temperatures of diffuse reflector is strong, and reflection evenly; Three, simple in structure, easy to process; Four, the impact resisting vibrating ability is strong.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.The large diameter hole that is positioned at the right, quartz pushrod cross section in figure is the pumping lamp installing hole, and the small diameter bore that is positioned at the left side, quartz pushrod cross section is the laser bar installing hole.
Embodiment
Below the present invention is described in further details.Referring to Fig. 1, a kind of laser pump cavity for high power solid state laser, comprise a quartz pushrod 1, in quartz pushrod 1 inside, a pumping lamp installing hole is arranged, the pumping lamp installing hole connects two end faces of quartz pushrod 1, at the inner laser bar installing hole in addition of quartz pushrod 1, the laser bar installing hole connects two end faces of quartz pushrod 1, and the axis of pumping lamp installing hole is parallel with the axis of laser bar installing hole; It is characterized in that: at quartz pushrod 1, remove on the outer surface of two end faces and be coated with the optically focused reflectance coating, the optically focused reflectance coating is divided into three layers, is respectively from inside to outside: diffuse reflection coating 2, silicon dioxide film 3 and metallic reflective coating 4; Diffuse reflection coating 2 is BiSO
4Coating or MgO coating or polytetrafluorethylecoatings coatings, thickness are 0.1mm～1mm; The thickness of silicon dioxide film 3 is 5 μ m～500 μ m; Metallic reflective coating 4 is aluminium film, silverskin or golden film, and the thickness of metallic reflective coating [4] is 50 μ m～500 μ m.
Operation principle of the present invention is: the diffuse reflection coating can converge to the part of pumping lamp radiation (diffuse reflection) on laser bar equably; Diffuse reflector plates one deck SiO outward
2, reinforce the diffuse reflection coating on the one hand, can suppress parasitic oscillation on the other hand, improve pumping efficiency; Outermost layer is the metal high-reflecting film, will be through diffuse reflection coating and SiO
2The pump light of coating reflects back (the imaging reflection adds diffuse reflection) again, isolates simultaneously cooling fluid to improve reflectivity, and the thickness of whole like this rete can be less than 1mm, and directly water flowing is cooling for outer surface.This simple structure has the light gathering efficiency of metal imaging laser pump cavity and the pumping homogeneity of diffuse-reflective cavity, therefore under high power pump, utilizes single-lamp pump just can in laser bar, obtain uniform pump energy and distributes.
Laser bar and pumping lamp installing hole provide the cooling duct of pumping lamp and laser bar simultaneously, usually the heat in the pumping lamp passage is higher, heat accumulation is little on the pumping lamp impact, and laser bar passage heat is lower, but heat accumulation can produce and have a strong impact on laser bar, cooling duct is separate can reduce the impact of the heat of pumping lamp on laser bar, improves cooling effectiveness.
Quartz pushrod of the present invention adopts a monoblock vitreous silica to process, high temperature resistant, corrosion resistant characteristic that quartz material has, also have good physicochemical properties, the optically focused reflectance coating is attached to the outer surface of quartz pushrod firmly, the installing hole of laser bar and pumping lamp is directly processing on quartzy cavity, no longer need extra water cold sleeve and hermetically-sealed construction, the design that simplifies the structure, improved long-time stability.
Quartz pushrod can also strontium is quartzy to be manufactured with mixing, and in order to useless ultraviolet light in the radiation of absorptive pumping lamp, prevents working-laser material " bleaching ".
Embodiment 1
The quartz pushrod profile adopts column type, and the diffuse reflection coating adopts the thick BaSO of spraying process plating 0.3mm
4Powder, next with vapour deposition method processing one deck SiO
2Coating, thickness are 50 μ m; Metallic reflector adopts ag material, and thickness is 0.2mm.
Laser bar adopts Nd:YAG, diameter Ф 15mm, and pumping lamp adopts xenon flash lamp.The gain measurement result shows the pump cavity for this structure, and the inhomogeneities gained in the laser bar cross section is no more than 5%, and the calculating of amplifier is shown to this gain inequality can obtain in the output of amplifier satisfied radiation intensity uniformity.Adopt the one-level local oscillator to add level Four and amplify mode of operation, wherein level Four is amplified this laser pump cavity manufacture of employing, obtains 100Hz, 3J, pulsewidth 10ns high-peak power Laser output, and beam quality is better than 5mm*mrad.This laser is because repetition rate is higher, and thermal lensing effect is more serious, the pumping homogeneity of laser pump cavity has been proposed to higher 0 requirement, so the diffuse reflection coating is thicker.0
The quartz pushrod profile still adopts column type, and the diffuse reflection coating adopts the thick BaSO of spraying process plating 0.15mm
4Powder, next with vapour deposition method processing one deck SiO
2Coating, thickness are 100 μ m; Metallic reflector adopts ag material, and thickness is 0.3mm.
Adopt the one-level local oscillator to add level Four and amplify mode of operation, wherein level Four is amplified this laser pump cavity manufacture of employing, obtains 5Hz, 6J, pulsewidth 10ns high-peak power Laser output, and beam quality is better than 5mm*mrad.This laser is because repetition rate is low, and single pulse energy is high, therefore suitably reduces the diffuse reflection coating layer thickness, increases the metallic reflection layer thickness.The advantages such as this laser is for laser surface shock peening process equipment, has a volume little lightweight, reliable and stable, easy and simple to handle.
Claims (1)
1. laser pump cavity for high power solid state laser, comprise a quartz pushrod [1], in quartz pushrod [1] inside, a pumping lamp installing hole is arranged, the pumping lamp installing hole connects two end faces of quartz pushrod [1], at the inner laser bar installing hole in addition of quartz pushrod [1], the laser bar installing hole connects two end faces of quartz pushrod [1], and the axis of pumping lamp installing hole is parallel with the axis of laser bar installing hole; It is characterized in that: at quartz pushrod [1], remove on the outer surface of two end faces and be coated with the optically focused reflectance coating, the optically focused reflectance coating is divided into three layers, is respectively from inside to outside: diffuse reflection coating [2], silicon dioxide film [3] and metallic reflective coating [4]; Diffuse reflection coating [2] is barium sulfate coating or polytetrafluorethylecoatings coatings, and thickness is 0.1mm～1mm; The thickness of silicon dioxide film [3] is 5 μ m～500 μ m; Metallic reflective coating [4] is aluminium film, silverskin or golden film, and the thickness of metallic reflective coating [4] is 50 μ m～500 μ m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310331847.3A CN103414095B (en) | 2013-08-01 | 2013-08-01 | A kind of laser pump cavity for solid state laser |
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| CN201310331847.3A CN103414095B (en) | 2013-08-01 | 2013-08-01 | A kind of laser pump cavity for solid state laser |
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| CN103414095A true CN103414095A (en) | 2013-11-27 |
| CN103414095B CN103414095B (en) | 2016-08-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785851A (en) * | 2017-02-08 | 2017-05-31 | 北京宏强富瑞技术有限公司 | For the main power amplifier device of all solid state ultrafast laser |
| CN106848819A (en) * | 2017-02-08 | 2017-06-13 | 北京宏强富瑞技术有限公司 | The main power amplifier device of all solid state ultrafast laser |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090118U (en) * | 1990-06-19 | 1991-12-04 | 中国科学院长春光学精密机械研究所 | High-power narrow inpulse duration and wave packet high frequency pulse solid laser |
| US5553092A (en) * | 1994-05-17 | 1996-09-03 | Alliedsignal Inc. | Solid state laser with integral optical diffuser plate to homogenize optical pumping |
| JPH098385A (en) * | 1995-06-15 | 1997-01-10 | Nec Corp | Solid state laser oscillator |
| CN1741327A (en) * | 2005-09-15 | 2006-03-01 | 中国科学院上海光学精密机械研究所 | Diffuse reflecting pump cavity |
| CN200969478Y (en) * | 2006-11-13 | 2007-10-31 | 上海奥通激光技术有限公司 | Novel laser focusing cavity |
-
2013
- 2013-08-01 CN CN201310331847.3A patent/CN103414095B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090118U (en) * | 1990-06-19 | 1991-12-04 | 中国科学院长春光学精密机械研究所 | High-power narrow inpulse duration and wave packet high frequency pulse solid laser |
| US5553092A (en) * | 1994-05-17 | 1996-09-03 | Alliedsignal Inc. | Solid state laser with integral optical diffuser plate to homogenize optical pumping |
| JPH098385A (en) * | 1995-06-15 | 1997-01-10 | Nec Corp | Solid state laser oscillator |
| CN1741327A (en) * | 2005-09-15 | 2006-03-01 | 中国科学院上海光学精密机械研究所 | Diffuse reflecting pump cavity |
| CN200969478Y (en) * | 2006-11-13 | 2007-10-31 | 上海奥通激光技术有限公司 | Novel laser focusing cavity |
Non-Patent Citations (1)
| Title |
|---|
| 骆青 等: "用于YAG激光器聚光腔的高反膜系", 《激光技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785851A (en) * | 2017-02-08 | 2017-05-31 | 北京宏强富瑞技术有限公司 | For the main power amplifier device of all solid state ultrafast laser |
| CN106848819A (en) * | 2017-02-08 | 2017-06-13 | 北京宏强富瑞技术有限公司 | The main power amplifier device of all solid state ultrafast laser |
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| CN103414095B (en) | 2016-08-10 |
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