Fused silica element zero probability damage threshold prediction method based on photo-thermal weak absorption

Abstract

The invention discloses a fused silica element zero probability damage threshold prediction method based on photo-thermal weak absorption; the method comprises the following steps: pre-processing the surface areas of a standard fused silica element sample of the same model with a to-be-tested fused silica element in different levels; carrying out photo-thermal detection on the areas processed in different levels so as to obtain a photo-thermal detection value, and carrying out a laser threshold test so as to obtain a zero probability damage threshold; building a photo thermal detection-zero probability damage threshold association curve model of the to-be-tested fused silica element according to the photo-thermal detection values and corresponding zero probability damage thresholds of all areas; carrying out photo-thermal detection for the to-be-tested fused silica element so as to obtain the photo-thermal detection value, searching the corresponding zero probability damage threshold according to the photo thermal detection-zero probability damage threshold association curve model, thus obtaining the zero probability damage threshold of the to-be-tested fused silica element. The method can realize nondestructive test on the fused silica element, is simple in operation, high in accuracy, high in sensitivity, and can satisfy laser optical system usage requirements.

Description

technical field [0001] The invention relates to a method for evaluating the laser load capacity of fused silica optical elements after polishing, in particular to a method for predicting the zero-probability damage threshold of fused silica elements based on photothermal weak absorption, which is used to evaluate the laser load capacity of the surface of fused silica elements by using photothermal detection means , to predict laser damage threshold for fused silica components. Background technique [0002] The development of high-power laser technology puts forward higher requirements on the laser load performance of optical components. At present, fused silica components are widely used in high-power lasers, and their absorption of irradiated laser light will lead to an increase in their internal temperature, thermal deformation on the surface and changes in the internal refractive index, resulting in laser damage. therefore. Fused silica absorption losses are an importan...

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Problems solved by technology

[0004] The surface absorption of fused silica components can be accurately measured by photothermal deflection method, but the relationship between the absorption of fused silica components and their laser damage threshold is still unclear

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