1 μm 高功率连续激光对不锈钢辐照毁伤特性

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中图分类号：TN249 文献标识码：A

doi：10. 37188/OPE. 20253306. 0874 CSTR：32169. 14. OPE. 20253306. 0874

Radiation damage characteristics of stainless steel by 1 μm high power continuous laser

WANG Xihui1，LIU Xiaozheng2，ZHANG Haitao2*，KOU Yuxin3，MENG Kuo1

（1. School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology University，Beijing 102206，China；

2. State Key Laboratory of Precision Space-time Information Sensing Technology，Department of Precision Instruments，Tsinghua University，Beijing 100084，China；

3. Shenyang Aircraft Design & Research Institute，Shenyang ，China） * Corresponding author，E-mail：zhanghaitao@mail. tsinghua. edu. cn

Abstract：Through a series of simulation and experimental observation，the damage process of 1{μm high power continuous laser on 304 stainless steel was deeply analyzed，and the influence of different power density，material thickness and thermal coupling on the material burn-through time and its change rule were emphatically discussed. The results show that with the increase of stainless steel thickness，the influ⁃ ence of thermal stress and temperature gradient on material deformation and crack formation is intensified， resulting in the increase of laser power density and time required for penetration. The contribution of ther⁃ mal stress further accelerates the failure process of the material，especially at higher power density，ther⁃ mal deformation and stress concentration significantly affect the mechanical properties of the material. As a result，there are significant differences in the penetration damage threshold of 304 stainless steel with a thickness of 0.5⋅2mm under high power continuous laser irradiation. Finally，the functional relationship between laser irradiation time and material thickness and breakdown threshold is obtained through numeri⁃ cal analysis and data fitting，so as to achieve quantitative evaluation of the penetration and damage charac⁃ teristics of 304 stainless steel with high power continuous laser.

Key words：continuous laser；stainless steel；breakdown threshold；damage effects

1 引 言

随着激光技术的飞速发展，具有更高功率密度的强激光束可作为新式武器，能够在短时间内对各种载具上的关键精密仪器及工程装备造成致命损毁［1］。（剩余12620字）