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Laser resonant cavity with pan-shaped mirror surface

A laser resonator and pan technology, applied in the field of resonators, can solve the problems of high adjustment requirements and inability to apply laser systems, etc., and achieve the effect of low adjustment requirements, high output power, and not easy to be out of adjustment

Inactive Publication Date: 2014-01-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adjustment requirements of this cavity are high, and it cannot be applied to various laser systems with low gain or fine aperture

Method used

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  • Laser resonant cavity with pan-shaped mirror surface
  • Laser resonant cavity with pan-shaped mirror surface
  • Laser resonant cavity with pan-shaped mirror surface

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 2 As shown, in the first embodiment of the present invention, the working surface of the output mirror 1 is in the shape of a pan, and the ratio of the diameter b of its circular plane Q to the outer diameter a of the concave spherical torus H is: b / a= 0.4 to 0.7, the relationship between the curvature radius R of the concave spherical torus H and the length L of the laser resonator is: R=5L. The Fresnel number of the resonator is a 2 / (Lλ)=6.2. The working surface of the reflecting mirror 2 is planar. Analysis of the laser resonator of embodiment 1 shows that its output beam is annular, and the power peak position is not at the center of the mirror, but on a circle with the center of the mirror as the center, which can reduce the output mirror 1, reflector 2 and The temperature of the center of the lens in the outer optical path reduces thermal deformation and improves beam stability.

[0033] Such as image 3 As shown in FIG. 1 , it is a schematic...

Embodiment 2

[0042] Such as Figure 7 As shown, in the second embodiment of the present invention, the working surface of reflector 2 is pan-shaped, and the ratio of the diameter b of its circular plane Q to the outer diameter a of the concave spherical torus H is: b / a= 0.6-0.7, the relationship between the curvature radius R of the concave spherical torus H and the length L of the laser resonator is: R=5L. The working surface of the output mirror 1 is planar. The laser working medium 3 adopts an annular columnar structure. Analysis of the laser resonator of embodiment 2 shows that its output beam is annular, and the power peak position is not at the center of the mirror, but on a circle with the center of the mirror as the center, which can reduce the output mirror 1, reflector 2 and The temperature of the center of the lens in the outer optical path reduces thermal deformation and improves beam stability.

[0043] Compared with the traditional stable cavity, the pan-shaped mirror lase...

Embodiment 3

[0045] Such as Figure 8 As shown, in the third embodiment of the present invention, the working surfaces of the output mirror 1 and the reflecting mirror 2 are both in the shape of a pan, and the ratio of the diameter b of the circular plane Q to the outer diameter a of the concave spherical torus H is : b / a=0.6~0.8, the relationship between the radius of curvature R of the concave spherical torus H and the length L of the laser cavity is: R=7L. Analysis of the laser resonator of embodiment 3 shows that its output beam is annular, and the power peak position is not at the center of the mirror surface, which can reduce the temperature of the output mirror 1, reflector 2 and the center of the outer optical path lens, reduce thermal deformation, and improve Beam stability.

[0046] Compared with the traditional stable cavity, the working surface of the output mirror 1 and the reflector 2 adopts a pan-shaped laser resonator. In the case of ensuring the quality of the output lase...

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Abstract

The invention discloses a laser resonant cavity with a pan-shaped mirror surface, comprising an output mirror, a reflecting mirror and a laser working medium, wherein the output mirror and the reflecting mirror are arranged oppositely in the resonant cavity, and the laser working medium is arranged between the output mirror and the reflecting mirror, and at least one of the output mirror and the reflecting mirror is provided with a pan-shaped working surface which is formed by a concave spherical ring surface being internally tangent and connected with a round plane. Particularly, the relationship between the curvature radius R of the concave spherical ring surface and the length L of the laser resonant cavity is as follows: R is greater than L and less than 10L; and the ratio of the diameter b of the round plane to the external diameter of the concave spherical ring surface is as follows: b / a=0.4-0.8. According to the laser resonant cavity, laser with high quality of beams can be output within large fresnel range, and large volume and high power output can be obtained. In addition, the laser resonant cavity has the advantages of simple processing, convenient adjustment, stable operation, large volume of mode, small angle of divergence and high quality of beams. The laser resonant cavity can be applied in medium-high power gas or solid laser, particularly the laser resonant cavity is suitable for laser with large-volume gain medium.

Description

technical field [0001] The invention relates to a resonant cavity in laser oscillation technology, in particular to a pan-shaped mirror laser resonant cavity. Background technique [0002] In many occasions of laser applications, such as laser drilling, welding, cutting, and laser medical and other micro-precision processing, it is hoped that the laser can preferably work in the fundamental mode or low-order mode state with small divergence angle and good beam quality. Traditional mode selection techniques, such as the use of an aperture stop, can improve the quality of the laser output beam, but the use of an aperture stop limits the mode volume of the laser beam to a large extent, increases the mode loss, and reduces the working efficiency of the laser. [0003] The key to the design of high-power laser devices is to achieve high-power single-mode or low-order mode operation while obtaining the largest possible mode volume and good transverse mode discrimination ability, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/08
Inventor 肖瑜秦应雄唐霞辉杨钒王炜
Owner HUAZHONG UNIV OF SCI & TECH