A method for measuring the thermal focal length of a solid-state laser

Abstract

The invention discloses a solid laser thermal focal length measurement method and device. By utilizing a law that a stable area of a solid laser moves along with curvature change of a spherical deformation mirror, a relationship between laser output power and pumping power in a certain range is measured to gradually reduce a position of the stable area, and finally, a thermal lens focal distance under each power is calculated through a linear relationship between thermal lens focal power and the pumping power. According to the method and device, an extra light path is not required and the mechanical structure of a resonant cavity does not need to be changed during the operation on one hand, so that the operation is more convenient when being compared with the traditional method, and the focal power change range of thermal lenses can be accurately measured by utilizing a two-step method of stable area maps and measurement can be realized under practical operation states of laser crystals on the other hand, so that the reliability of measurement results is further improved.

Description

technical field [0001] The invention belongs to the field of laser technology, and more specifically relates to a method for measuring the thermal focal length of a solid-state laser. Background technique [0002] Due to the advantages of small size, high power, and good beam quality, solid-state lasers are widely used in material processing, national defense and scientific research. However, the thermal lens effect seriously affects the output power of solid-state lasers, the stability of the resonator and the quality of the output beam. [0003] Through the compensation of the thermal lens, the operation of the solid-state laser can be greatly improved. First, because the sensitivity of the laser spot size to the thermal focal length change caused by the pump power change is reduced, the dynamic stability of the laser output power is improved; secondly, due to the improvement The stability of the optical path structure of the laser resonator is improved, and the requireme...

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Problems solved by technology

[0005] In view of the defects of the prior art, the object of the present invention is to provide a method for measuring the thermal focal length of a solid-state laser, aiming at solving the problem that the existing measurement technology cannot conveniently and accurately measure the thermal focal length of the solid-state laser in actual operation

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