大能量长脉冲激光能量计吸收体温度特性  

Temperature characteristics of absorber for large-energy long pulse laser energy meter

作　　者：李南 乔春红[1] 范承玉[1] 杨高潮 Li Nan;Qiao Chunhong;Fan Chengyu;Yang Gaochao(Key Laboratory of Atmospheric Composition and Optical Radiation,Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Hefei 230031,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院安徽光学精密机械研究所大气成分与光学重点实验室,安徽合肥230031 [2]中国科学院大学,北京100049

出　　处：《红外与激光工程》2018年第4期148-153,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61405205)

摘　　要：以大能量长脉冲激光能量的准确测量需求为牵引,针对激光能量计吸收体温度特性进行了数值分析研究。结果表明:吸收体内壁温度随脉冲结构呈周期性振荡,随着壁深的增加,震荡幅度迅速地降低,吸收体外壁温度周期性消失。单脉冲能量相同时,脉宽越短,吸收体内壁温升越高;重复频率越高,吸收体内壁温升越高。而总能量相同时,重复频率越高,内壁温升越低。通过对吸收体结构的优化设计,不仅能够获得序列长脉冲激光的总能量,而且可以获得低重频(一般不大于10Hz)序列脉冲激光的每个脉冲能量,从而为长脉冲激光能量计的设计及应用等提供参考依据。For requirement of accurate measurement of large-energy long pulse laser energy,the temperature characteristics of absorber for laser energy meter are numerically analyzed and researched.The results show that,the temperature of absorber inwall rises with periodic oscillation.As the wall deep increasing,the oscillation amplitude decreases rapidly.The temperature of absorber outerwall is without periodism,and it rises gradually with time.Meanwhile,the factors to affect the temperature rise are single pulse energy,pulse width and repetition frequency.When the single pulse energy is same,the shorter the pulse width,the higher the temperature rise of absorber inwall.And also the higher the pulse repetition frequency,the higher the temperature rise of absorber inwall.But when the total energy is same,the higher the repetition frequency,the lower the temperature rise of absorber inwall.By the optimization design of absorber structure,the total energy of long pulse laser sequence can be measured.As well as the energy of every pulse for low repetition frequency pulse sequence can be obtained,when the repetition frequency of long pulse laser sequence is less than 10 Hz.The work provides important references for the design and application of large-energy long pulse laser energy meter.

关 键 词：激光能量计 吸收体 长脉冲激光 温度特性 

分 类 号：TN249[电子电信—物理电子学] TB96[机械工程—光学工程]