Large-face pumping slab laser module capable of efficient cooling

A laser module and large surface pump technology, applied in lasers, laser parts, phonon exciters, etc., can solve problems such as affecting the beam quality of the output beam, reducing thermal gradients, etc., achieving low loss, reducing thermal gradients, The effect of high laser output

Inactive Publication Date: 2014-07-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the large-area pumping scheme of the upper and lower surfaces of the existing solid slab laser. The upper and lower surfaces are respectively used as the pumping surface and the cooling surface. Cooling on a single surface is likely to generate thermal gradients in the longitudinal direction, which affects the output beam. Insufficient beam quality, use the method of bonding on the large surface of the lath laser medium or the method of transparent heat sink with high thermal conductivity and good light transmittance to replace the existing metal heat sink welding method, which can eliminate the impact of welding on the laser beam. The stress caused by the medium and the use of a transparent cooling device can realize the cooling of the two surfaces separately and reduce the thermal gradient generated in the longitudinal direction, thereby achieving high-power, high-beam quality laser output

Method used

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  • Large-face pumping slab laser module capable of efficient cooling
  • Large-face pumping slab laser module capable of efficient cooling
  • Large-face pumping slab laser module capable of efficient cooling

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Effect test

Embodiment 1

[0042] figure 1 Shown: a large-area pumped slab laser module with high efficiency cooling, including: slab laser medium 1, first transparent heat sink 2-01, second transparent heat sink 2-02, first transparent cooling device 3- 01. The second transparent cooling device 3-02, the first semiconductor pumping source 4-01, the second semiconductor pumping source 4-02, the first pumping beam 5-01 and the second pumping beam 5-02.

[0043] The slab laser medium 1 uses Nd:YAG crystal, the doping concentration of Nd ions is 0.6%, and its size is a parallelepiped slab of 80mm×30mm×3mm. The two upper and lower planes of the slab are parallel, and the two left and right end surfaces are also parallel. and form Brewster's angle with the main plane;

[0044] The semiconductor pump source 4 includes 2 pumping arrays, each array is composed of 60 semiconductor laser (LD) arrays, arranged in 20 rows and 3 columns, each LD output power is 20W, and the wavelength is 808nm; the semiconductor pu...

Embodiment 2

[0047] figure 2 Shown: a large-area pumped slab laser module with high efficiency cooling, including: slab laser medium 1, first transparent heat sink 2-01, second transparent heat sink 2-02, first transparent cooling device 3- 01. The second transparent cooling device 3-02, the semiconductor pumping source 4 and the pumping beam 5.

[0048] It can be seen from the figure that this embodiment has made technical improvements based on the efficiently cooled large-area pumped slab laser module in embodiment 1. Compared with the embodiment 1, the structural improvement of this embodiment is that the pumping method is changed from double-sided large-area pumping to single-side large-area pumping to obtain a simpler structure. The semiconductor pump source 4 includes a pumping array, which is composed of 60 semiconductor laser (LD) arrays, arranged in 20 rows and 3 columns, each LD has an output power of 20W and a wavelength of 808nm. Compared with bilateral symmetrical pumps, un...

Embodiment 3

[0050] image 3 Shown: a large-area pumped slab laser module with high efficiency cooling, including: slab laser medium 1, first transparent heat sink 2-01, second transparent heat sink 2-02, first transparent cooling device 3- 01. The second transparent cooling device 3-02, the first semiconductor pumping source 4-01, the second semiconductor pumping source 4-02, the first pumping beam 5-01 and the second pumping beam 5-02.

[0051] It can be seen from the figure that this embodiment has made technical improvements based on the efficiently cooled large-area pumped slab laser module in embodiment 1. The difference from the structure of Embodiment 1 is that the longitudinal section of the slab laser medium 1 is changed from a parallelogram slab structure cut at Brewster’s angle to an isosceles trapezoidal slab structure cut at Brewster’s angle, for obtaining different orientations. laser output. The dimensions of the upper and lower sides of the isosceles trapezoid are 80mm a...

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Abstract

A large-face pumping slab laser module capable of efficient cooling comprises slab laser mediums, a transparent heat sink, a transparent cooling device and a semiconductor pumping source. According to the large-face pumping slab laser module capable of efficient cooling, the transparent heat sink high in heat conductivity and good in light transmission is bonded or manufactured on the large face of the solid slab laser mediums through optical cement, and the transparent cooling device is used for obtaining the large face of a slab laser and meanwhile serving as a cooling face or a pumping face so as to change the situation that for an existing large-face pumping slab module, only an upper surface and a lower surface can serve as a pumping face and a refrigerating face respectively, thermal gradient is easy to form in the longitudinal pump light direction due to single-surface refrigeration, output light beams are influenced, and quality of the light beams is not sufficient. The bonding or optical cement mode on the large face of the laser mediums is adopted for replacing the welding mode of the metallic heat sink so as to eliminate the stress on the laser mediums caused by welding, and therefore high-power and high-light-beam-quality laser output is achieved.

Description

technical field [0001] The invention relates to a solid-state laser, in particular to a high-efficiency cooling large-surface pumping slab laser module capable of obtaining high-power and high-beam-quality laser output. Background technique [0002] The all-solid-state laser pumped by semiconductor laser is a great innovation in the development of solid-state laser technology. It combines the advantages of high efficiency and long life of semiconductor lasers and good beam quality of solid-state lasers, and has been widely used. At present, solid-state lasers mainly include rod lasers, disk lasers and slab lasers. Among them, due to the large radial temperature gradient and severe thermal lens effect, rod lasers are difficult to achieve high beam quality while obtaining high-power laser output; disk lasers are difficult to achieve high-efficiency laser output due to thin disk thickness and low axial gain. ; The slab laser has high axial gain and high efficiency, and can re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/042
Inventor 许祖彦王鹏远薄勇彭钦军申玉宗楠
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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