Laser damage threshold and nonlinear absorption co-target-surface measuring device and method

Abstract

The invention discloses a laser damage threshold and nonlinear absorption co-target-surface measuring device and method. The device comprises an ultrafast laser, an adjustable attenuation sheet, a shutter, a focusing lens, a first spectroscope, a first photoelectric detector, a to-be-measured sample, an electric control displacement table, a second spectroscope, a second photoelectric detector, abeam expander set, a CCD camera, a computer and a light beam quality analyzer, wherein the adjustable attenuation sheet, the shutter, the focusing lens, the first spectroscope, the to-be-measured sample, the second spectroscope, the beam expander set and the CCD camera are sequentially arranged in the laser output direction of the laser device; and the effective area of the laser focus is measuredby adopting the beam quality analyzer. In addition, the same focusing light field and image transmission method are adopted, it is ensured that a light source causing sample damage and a light sourceexciting sample nonlinear absorption have completely equal target surface light spot distribution, and the relation between laser damage and sample nonlinear absorption is further analyzed conveniently.

Description

Technical field[0001]The present invention relates to an optical element laser damage test and a non-linear absorption measurement field, in particular, based on the image transfer method, can perform measurements of laser damage threshold and Z scan optical nonlinear absorption under the same conditions as the target surface spot distribution.Background technique[0002]The damage under strong laser irradiation occurs, especially the pulse width is a high-power laser-induced damage, which is caused by nonlinear absorption of laser light. Focused laser spot target surface distribution information for the analysis of laser-induced damage to the mechanism and nonlinear absorption has important significance, it is necessary that the laser damage threshold and nonlinear absorption conditions with the same spot distribution measurement target surface, thereby establishing a target Connection between Laser Distribution - Laser Induction Nonlinear Absorption - Laser Induced Damage in Laser S...

AI Technical Summary

Problems solved by technology

[0005] If you do not establish an integrated device for measuring linear absorption and damage threshold with a common focusing optical path, it is difficult to keep the distribution of the target surface spot in the two measuring devices completely consistent

However, the integrated measurement device must take into account the focus requirements of the two types of measurement, and must use a short-focus lens to focus the light beam. At this time, the damage point induced by the laser is too small, and it is not convenient to determine whether the damage occurs online.

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