Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light

A laser crystal, non-uniform technology, applied in the device, laser, laser parts and other directions that control the output parameters of the laser, can solve the problems of end face explosion, film peeling, affecting the normal operation of the laser, etc., to achieve high conversion efficiency, high beam Quality, avoid the effect of peeling off the crystal end film layer

Inactive Publication Date: 2014-01-01
XIDIAN UNIV
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Problems solved by technology

For a high-power pump source, the optical field density increases rapidly. After the pump light converges, the strong thermal effect will become the main

Method used

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  • Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light
  • Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light
  • Method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light

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Embodiment 1

[0022] Such as image 3 As shown, replace with radial step doped crystal 8 figure 1 In the uniformly doped crystal 4, under the condition that the pump light distribution is determined, by changing the doping concentration and doping range of the step-doped crystal 8, the control of the gain region and temperature distribution is realized. At this time, the pump light does not need to be focused on the crystal end face, and the absorption distribution of the pump light in the crystal is determined by the doping range of the radially stepped doped crystal 8. In this way, the thermal lens effect at the crystal pump end face 10 is weakened, It can effectively increase the injection power of the crystal end face, which is beneficial to obtain high power and high beam quality.

Embodiment 2

[0024] Such as Figure 4 As shown, replace with radial continuous doped crystal 9 figure 1 The uniformly doped crystal 4 in , under the condition that the pump light distribution is determined, through the optimization of the radial continuous doping concentration distribution, such as parabolic distribution, can realize the control of the crystal absorption distribution (that is, the gain distribution), and reduce the crystal The radial temperature difference suppresses the thermal effect and obtains a large fundamental mode volume. The spatial coincidence of the gain region and the distribution region of the fundamental mode of the resonator can be achieved without focusing the pump light near the pumping end face of the crystal, thereby greatly increasing the injection power at the end face while ensuring high beam quality. The design and optimization process of the radial doping concentration distribution of the crystal mainly involves the calculation of the steady-state...

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Abstract

The invention relates to a method of distribution of absorption of laser crystal radial-direction non-uniform doping control pump light. The method is characterized in that after the pump light output by an optical fiber coupling laser diode optical fiber output end is gathered by a coupling system, the light field of the pump light is distributed in a Gaussian mode or flat Gaussian mode; a pump light anti-reflection film and an oscillating high-reflection film are plated on the pump end face of a radial-direction non-uniform doping crystal, an output mirror is a plane mirror, and the output mirror and the oscillating light high-reflection film on the pump end face of the crystal form a flat resonant cavity; in the working process, a thermal lens formed in the crystal can be simply equivalent to a thin lens on the pump end face of the radial-direction non-uniform doping crystal, and the resonant cavity becomes a stable cavity through the gather effect of the thermal lens; under the condition that a pump light distribution area and an oscillating light distribution area are determined, the spatial overlapping of the pump light distribution area and the oscillating light distribution area are achieved through the radial-direction non-uniform doping optimization design of the laser crystal. According to the method, ideal space coupling efficiency and ideal beam quality can be achieved.

Description

technical field [0001] The invention relates to a laser diode-pumped solid-state laser, in particular to a method for controlling pumping light absorption distribution by radial non-uniform doping of laser crystals of the laser diode-pumped solid-state laser. Background technique [0002] Diode-pumped solid-state lasers have the advantages of small size, light weight, and all-solid-state, and have received extensive attention. In recent years, the output power of diode-pumped solid-state lasers has been greatly improved with the increase of pump source power. The most direct problem caused by the use of high-power pump sources is the crystal thermal effect. By designing the focusing system and appropriately increasing the focused spot of the pump light, the power density of the pump light can be reduced, thereby reducing the thermal effect of the crystal, but this is achieved by sacrificing the energy utilization of the fundamental mode. At the same time, a large pump light...

Claims

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Application Information

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IPC IPC(8): H01S5/06H01S3/102H01S3/0933H01S3/16
Inventor 李兵斌过振王石语蔡德芳文建国
Owner XIDIAN UNIV
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