Large-aperture optical element reflectivity measuring system

Abstract

The invention provides a system for measuring the reflectivity of a large-aperture optical element. In the system, a first light beam adjusting device converts wide-spectrum ultrafast laser into a linear light beam or a rectangular light beam; the initial optical resonant cavity does not comprise an optical element, and the linear light beam or the rectangular light beam is ring-down in the optical resonant cavity to form a first ring-down signal; the linear light beam or the rectangular light beam is ring-down in a test optical resonant cavity comprising an optical element to form a second ring-down signal; and correspondingly determining first ring-down time of an initial optical resonant cavity and second ring-down time of a test optical resonant cavity according to the collected first ring-down signal and the second ring-down signal, and obtaining the reflectivity of the optical element according to the first ring-down time, the second ring-down time, the cavity lengths of the initial optical resonant cavity and the test optical resonant cavity. According to the invention, the reflectivity measurement precision and speed of the optical element can be improved.

Description

technical field [0001] The invention belongs to the field of reflectivity measurement of optical elements, and in particular relates to a large-diameter optical element reflectivity measurement system. Background technique [0002] With the gradual improvement of the coating process level, the reflectivity of large-aperture optical components is also getting higher and higher, even exceeding 99%. These large-aperture high-reflection optical components are widely used in various key technical fields such as high-power laser systems. For this reason, it is necessary to develop a fast and accurate method to measure the reflectivity of large-aperture high-reflection optical components, and provide detection for large-scale laser systems, so as to reduce risks and avoid losses. Traditional reflectance measurement methods such as spectrophotometry are based on the ratio of measured light intensity, and the measurement accuracy is low, which is difficult to meet the measurement ac...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a large-aperture optical element reflectivity measurement system to solve the problem of low measurement accuracy of the current optical element reflectivity measurement system

Images