Light spot intensity distribution acquisition method for laser batten surface detection

Abstract

The invention provides a light spot intensity distribution acquisition method for laser batten surface detection, and belongs to the field of quality detection of a laser batten; when an optical fiber white light interference measuring device is used for surface detection of the laser batten, and surface scanning is mainly depended on emergent light spots of a self-focusing lens optical fiber probe; the laser batten is held and controlled by a three-dimensional displacement table, in the process of continuously moving the laser batten, based on the characteristic that a self-focusing lens optical fiber probe emits a Gaussian-like beam, and based on a knife edge method light spot measurement technology, a reflection type measurement method of laser batten edge scanning light spots is provided, the light spots are equivalent to four equal fan-shaped areas, and a light spot intensity distribution parameter corresponding to each area is obtained; and meanwhile, the influence of mechanical return stroke errors is eliminated, and accurate light spot intensity distribution is obtained.

Description

technical field [0001] The invention relates to a method for acquiring light spot intensity distribution for laser lath surface detection, belonging to the field of laser lath quality detection. Background technique [0002] Laser slabs are the gain medium of high-power solid-state lasers. At present, YAG crystals doped with various rare earth elements are mainly used, that is, Yttrium Aluminum Garnet (Yttrium Aluminum Garnet), which originally originated from YAG crystal rods. With the development of technology, it is now usually The use of lath-bonded YAG crystals is mainly a compound structure crystal prepared by bonding rare earth-doped YAG crystals and pure YAG [Proc.SPIE.1992,1624:2-10.]. The method of testing the bonding surface of laser slabs based on optical fiber white light interference technology [CN202010488263.7] is a non-destructive, traceable and quantitative high-precision detection method, which relies on the point detection of the exit spot of the fiber op...

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Problems solved by technology

[0004] The purpose of the present invention is to effectively solve the problem that it is difficult to accurately obtain the intensity distribution of the light spot before the laser slab test. Based on the structural characteristics of the optical fiber white light interference test device, an innovative reflective measurement method for scanning the light spot at the edge of the laser slab is proposed, which breaks the existing There are limitations in the spot / beam intensity distribution detection method. At the same time, the changes of the scanning spot in different directions are compared, the spot is equivalent to four fan-shaped areas, and the intensity distribution parameters are obtained in different areas. At the same time, the mechanical return error of the translation stage is eliminated, which is the laser plate. Strip detection provides more complete technical support

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