A high-power yb:yag thin-plate laser mode-locked by a semiconductor saturable absorber mirror

Abstract

The invention discloses a high-power Yb:YAG sheet laser that is mode-locked by a semiconductor saturable absorption mirror, including a pump source that outputs pump laser light, a Yb:YAG sheet laser crystal that provides gain, and increases the absorption efficiency of the pump laser. The pump module, the first GTI mirror and the second GTI mirror to compensate for the dispersion in the cavity; the semiconductor saturable absorber mirror to start and maintain the mode-locked operation; the first concave mirror and the second concave mirror to form a confocal structure; generate A quartz plate with nonlinear effect and linear polarization of the output oscillating laser; a third concave mirror that increases the power density on the semiconductor saturable absorption mirror; an output mirror that outputs high-power mode-locked laser pulses. The invention realizes mode locking on Yb:YAG thin slice laser crystal, and obtains 12.1W femtosecond laser pulse output; compared with the previous bulk solid-state laser, the power has been significantly improved, and the output laser has good High beam quality.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a high-power Yb:YAG thin slice laser which is mode-locked by a semiconductor saturable absorption mirror. Background technique [0002] The solid-state laser technology pumped by laser diodes combines the advantages of traditional solid-state lasers and semiconductor lasers. It has the advantages of high efficiency, low cost, stable output, long service life, compact structure, convenient and practical, etc. , aerospace and other fields have a wide range of applications. There is a common problem in solid-state lasers: uneven heat dissipation, effects such as thermal lensing and thermal stress. The existence of the thermal lens effect not only limits the output power of the laser, but also leads to a decrease in the quality of the output laser beam. In addition, the thermal stress existing inside the crystal can cause damage to the crystal. Thermal effect has become...

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Problems solved by technology

[0003] The object of the present invention is to provide a high-power Yb:YAG thin-plate laser that is mode-locked by a semiconductor saturable absorbing mirror, aiming to solve the effects of uneven heat dissipation, thermal lens and thermal stress in solid-state lasers, which limit the output power of the laser , leading to the degradation of the output laser beam quality and the problem of crystal damage

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