Laser crystal thermal stress birefringence coefficient measurement method based on polarization cavity ring-down

Abstract

The invention discloses a laser crystal thermal stress birefringence coefficient measurement method based on polarized light cavity ring-down. Laser irradiation is adopted to heat a laser crystal to generate temperature rise, and a polarized light cavity ring-down method is adopted to measure thermal stress birefringence phase difference of the laser crystal at different temperatures, so the thermal stress birefringence coefficient of the laser crystal is obtained. According to the method, the high sensitivity and high precision characteristics of stress birefringence are measured by using thepolarized light cavity ring-down method, and very low thermal stress birefringence, thermal stress birefringence coefficients and two-dimensional spatial distribution of the laser crystal can be measured, so that the measurement precision of the low thermal stress birefringence coefficients and the spatial distribution of the laser crystal is greatly improved.

Description

technical field [0001] The invention relates to the field of detection of laser optical components, in particular to a method for measuring the thermal stress birefringence coefficient of laser crystals. Background technique [0002] With the continuous development and wide application of laser technology, laser crystals, which are the core components of lasers, are also developing rapidly, and new laser crystals with better performance continue to emerge, expanding the application of laser technology in more and more fields. In order to obtain laser output with high output power, good beam quality, and stable and controllable polarization characteristics, high-quality laser crystals are required. Defects inside laser crystals and the resulting inhomogeneous distribution of characteristics are the main limiting factors for the application of laser crystals, which can lead to unstable laser output power, deterioration of beam quality, reduction of polarization degree and even...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of low sensitivity and low precision in measuring the thermal stress birefringence coefficient of laser crystals based on the principle of polarization-analysis, and propose to use the polarization cavity ring-down method to accurately measure the laser crystal in the heating laser Thermal stress birefringence optical path difference under irradiation (and under non-irradiation conditions), so as to realize high-precision measurement of thermal stress birefringence coefficient of laser crystal

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