中红外高功率激光系统强光元件热损伤特性
Received:May 09, 2016  Revised:October 07, 2016  点此下载全文
引用本文:韩凯,闫宝珠,许晓军,刘泽金.中红外高功率激光系统强光元件热损伤特性[J].Journal of Infrared and Millimeter Waves,2016,35(6):741~747
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Author NameAffiliationE-mail
HAN Kai College of OptoElectronic Science and Engineering,National University of Defense Technology,Changsha hankai0071@nudt.edu.cn 
YAN Bao-Zhu College of OptoElectronic Science and Engineering, National University of Defense Technology,Changsha  
XU Xiao-Jun College of OptoElectronic Science and Engineering, National University of Defense Technology,Changsha  
LIU Ze-Jin College of OptoElectronic Science and Engineering, National University of Defense Technology,Changsha  
基金项目:国家高技术研究发展计划(863计划)
中文摘要:依托闭腔式氟化氘中红外高能激光器, 测量了元件表面污染物在连续波高能激光(3.16 kW/cm2)辐照下的温度, 测量发现污染物在1s内达到了热平衡, 温度维持在1 720 K; 建立了描述强光辐照下污染物热平衡过程的物理模型, 分析了污染物导致强光元件热损伤的物理机制; 研究发现污染物的尺度对强光元件的热损伤具有重要影响.对于中红外高反射强光光学元件, 若污染物的尺度小于20 μm一般不会造成强光元件的损伤, 若污染物的尺度大于200 μm一般会导致强光元件的损伤.研究结果对于提高强光元件的抗损伤性能, 保障中红外高能激光系统稳定运行具有重要意义.
中文关键词:中红外高功率激光系统  热损伤  临界尺度  闭腔式激光器
 
Thermal damage mechanism of the optical element used in mid-infrared high power laser system
Abstract:Based on the closed-cavity mid-infrared laser, the temperature of the contaminant was measured when it was irradiated by a cw high energy laser with power intensity 3.16 kW/cm2. It was found that the contaminant achieves thermal equilibrium in a second and then the temperature stays at 1720 K. A physical model was established to describe the process of the thermal equilibrium. The mechanism of the mirror’s thermal damage was analyzed. It shows that the contaminant size plays an important role in the thermal damage of the optical mirror. Only when the contaminant size is smaller than a critical size (~20 μm), the contaminant may reach thermal equilibrium and the optical mirror work well in the high energy laser system. If the contaminant size is quite large (>200 μm), the optical mirror will be damaged under the irradiation of high energy laser. The results are of great help for improving the anti-damage capability of the mirror and maintaining the security of the high energy laser system.
keywords:mid-infrared high power laser system, thermal damage, critical size, closed-cavity laser
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