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Micro-milling repair technical method for laser damage of surface of large-diameter KDP crystal element

A technology for laser damage and crystal components, which is applied to fine working devices, manufacturing tools, stone processing equipment, etc., can solve the problems of poor repair surface quality, single repair contour, low efficiency, etc., to extend service life, avoid interference, The effect of retarding growth behavior

Active Publication Date: 2018-10-26
HARBIN INST OF TECH
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Problems solved by technology

[0004] The invention aims to solve the problems of single repair contour, poor repair surface quality and low efficiency when repairing laser damage points on the surface of soft and brittle KDP crystal elements, and further provides a micro-milling repair process method for laser damage on the surface of large-diameter KDP crystal elements

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  • Micro-milling repair technical method for laser damage of surface of large-diameter KDP crystal element
  • Micro-milling repair technical method for laser damage of surface of large-diameter KDP crystal element
  • Micro-milling repair technical method for laser damage of surface of large-diameter KDP crystal element

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specific Embodiment approach 1

[0042] Specific implementation manner one: such as Figure 1 to Figure 15 As shown, the implementation process of the laser-damaged micro-milling repair process method for the surface of the large-diameter KDP crystal element described in this embodiment is:

[0043] Step 1. According to the laser damage degree of the KDP crystal surface and the morphological characteristics of the damage point, design a suitable laser "friendly" damage repair profile, and establish a geometric model of the repair point according to the control equation of the repair profile;

[0044] The laser "friendly" damage repair profile described in step 1 mainly includes three forms: Gaussian, hemispherical and ellipsoidal. The three types of repair profiles are based on the morphology, size and distribution of laser damage points on the KDP crystal surface Designed for the situation, respectively for the damage point with large area and small depth (ablation form), large damage point aspect ratio (pits, cr...

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Abstract

The invention discloses a micro-milling repair technical method for the laser damage of the surface of a large-diameter KDP crystal element, and belongs to the technical field of repair machining of optical materials and optical elements in order to solve the problems that during repair of laser damage points of the surface of a soft and fragile KDP crystal element, the repair outline is simplex,the repaired surface quality is poor, and the efficiency is low. A geometric model of repairing points is built according to a control equation of the repair outline. A machining tool is selected. A rough machining repair procedure is built. A finish machining repair procedure is built. A tool path source file worked out according to the track of a tool path is converted into common numerical control machining NC codes, and the NC codes are converted into a machining program file capable of being recognized by a repair machine tool controller. A precise micro-milling repair experiment is carried out on a KDP crystal repair machine tool through the rough and finish machining NC codes, and efficient and high-quality machining of different laser friendly repairing outlines is realized. The increase behavior of laser damage points of the surface of the crystal element can be delayed, the laser damage resistance of the crystal element is improved, and the service life of the crystal elementis prolonged.

Description

Technical field [0001] The invention belongs to the technical field of optical material and optical element repair processing, and specifically relates to a precision micromilling repair process method for laser damage points on the surface of a large-diameter KDP crystal element. Background technique [0002] KDP functional crystal materials should have unique optical properties and be used to make photoelectric switches and frequency doubling components, becoming an irreplaceable core device in laser-driven inertial confinement nuclear fusion engineering at this stage. At present, the single-point diamond fly-cutting ultra-precision machining technology can basically realize the processing and preparation of large-diameter, high-precision and high-quality crystal elements. The processing accuracy and surface quality of engineering KDP crystal elements have reached the limit level of mechanical processing. However, the processed crystal element is very easy to induce surface las...

Claims

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Application Information

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IPC IPC(8): B28D5/02B28D5/00
CPCB28D5/0064B28D5/02
Inventor 程健陈明君马文静杨浩刘启赵林杰王廷章刘志超王健许乔
Owner HARBIN INST OF TECH
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