CaF2晶体的不同晶面在355nm脉冲激光辐照下的损伤特性  

Damage Characteristics of CaF2 Crystals with Different Planes Irradiated by 355-nm Pulse Laser

作　　者：徐子媛 彭小聪[1,2,3] 赵元安 李大伟[1,2,3] 刘荣荣 苏良碧[5] 邵建达 Xu Ziyuan;Peng Xiaocong;Zhao Yuanan;Li Dawei;Liu Rongrong;Su Liangbi;Shao Jianda(Laboratory of Thin Film Optics.Shanghai Institute of Optics and Fine Mechanics.Chinese Academy of Sciences,Shanghai 201800,China;Key Laboratory of Materials for High Power Laser,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Applied Optics,Changchun Institute of Optics.Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,Jilin 130033,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China)

机构地区：[1]中国科学院上海光学精密机械研究所薄膜光学实验室,上海201800 [2]中国科学院强激光材料重点实验室,上海201800 [3]中国科学院大学材料与光电研究中心,北京100049 [4]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [5]中国科学院上海硅酸盐研究所,上海201899

出　　处：《中国激光》2019年第11期193-199,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(1913031G00)

摘　　要：研究了氟化钙(CaF2)晶体不同晶面在355 nm脉冲激光辐照下的损伤特性。在7.8 ns脉冲激光辐照下,测量(100)、(110)和(111)三种不同晶面样品的损伤阈值和损伤点形貌,并基于表面热透镜技术测量样品表面的光热弱吸收。实验结果表明:(111)晶面CaF2晶体样品的光热吸收最高,激光损伤阈值最低,损伤形貌表现为熔融坑,并伴随有片层状剥离,说明了(111)面在355 nm激光作用下易解理;(100)和(110)面晶体的损伤形貌同样为熔融坑,但损伤阈值及光热弱吸收与晶面无明确的关联。The laser damage characteristics of calcium fluoride(CaF2) crystals with various lattice planes irradiated by 355-nm pulse laser are investigated. Further, the damage thresholds and damage morphologies of three different lattice planes, i.e.,(100),(110), and(111), are measured under a 7.8-ns pulse laser irradiation. In addition, the photothermal absorption is evaluated by using the surface thermal lensing technique. The(111) CaF2 crystal exhibits the highest photothermal absorption and lowest laser damage threshold. The(111) damage morphology comprises a melt pit, which is accompanied by lamellar peeling, indicating that this plane is easily cleaved by the 355-nm laser. The(100) and(110) damage morphologies also comprise a melt pit;however, the damage threshold and photothermal absorption have no clear correlation with the two lattice planes.

关 键 词：材料 氟化钙(CaF2) 激光损伤 损伤阈值 损伤形貌 光热吸收 

分 类 号：O731[理学—晶体学]