Method and device for detecting three-dimensional distribution of absorption characteristics in transparent optical material body

Abstract

The invention provides a method and a device for detecting three-dimensional distribution of absorption characteristics in a transparent optical material body. The method and the device are characterized in that a beam of strong pump light is focused into the transparent optical material, the focus position of the pump light causes the local temperature increment of the transparent optical material due to the absorption of the light energy, so that the local physical characteristics inside the transparent optical material body are changed; a beam of weak detection light with the spreading direction being orthogonal with the spreading direction of the pump light is also focused into the transparent optical material body to be overlapped with the focus of the pump light, and the local physical characteristics variation of the transparent optical material caused by the pump light is detected, so that the absorption characteristics of the pump light focus position in the transparent optical material body can be obtained, and the three-dimensional space distribution of the absorption characteristics and defects in the transparent optical material body can be obtained by changing the position of the pump light focus in a sample body through scanning. The method and the device have the advantages of high resolution, high sensitivity and the like.

Description

technical field [0001] The invention relates to the technical field of detection of absorption characteristics of optical materials, in particular to a detection method and device for the three-dimensional distribution of absorption characteristics in transparent optical materials. [0002] Background technique [0003] Transparent optical materials are indispensable key components in strong laser systems, such as KDP crystals, which are often used as photoelectric switches and laser frequency doubling components in strong laser systems. Therefore, the ability of transparent optical materials to resist laser damage is one of the crucial factors affecting the performance of powerful laser systems. For transparent optical materials, it is the defects and impurities in the material that determine its ability to resist laser damage. [0004] Defects and impurities in transparent optical materials can be divided into two categories: one is surface defects and impurities, which ...

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Problems solved by technology

[0006] However, some defect detection methods commonly used at present, such as high-resolution scattering measurement methods, are mainly sensitive to some non-absorbing defects that cause beam scattering, and are difficult to be used for the analysis of absorbing defects.

However, in a strong laser system, the internal absorption defects of transparent optical materials are often more likely to cause damage and damage to the material. Therefore, effective analysis and detection of internal absorption defects in transparent optical materials is very important for the development and application of strong laser systems. Practical significance

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