中国激光, 2019, 46 (11): 1103001, 网络出版: 2019-11-09
CaF2晶体的不同晶面在355 nm脉冲激光辐照下的损伤特性 下载: 1266次
Damage Characteristics of CaF2 Crystals with Different Planes Irradiated by 355-nm Pulse Laser
材料 氟化钙(CaF2) 激光损伤 损伤阈值 损伤形貌 光热吸收 materials calcium fluoride(CaF2) laser damage damage threshold damage morphology photothermal absorption
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。
Abstract
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.
徐子媛, 彭小聪, 赵元安, 李大伟, 刘荣荣, 苏良碧, 邵建达. CaF2晶体的不同晶面在355 nm脉冲激光辐照下的损伤特性[J]. 中国激光, 2019, 46(11): 1103001. Ziyuan Xu, Xiaocong Peng, Yuanan Zhao, Dawei Li, Rongrong Liu, Liangbi Su, Jianda Shao. Damage Characteristics of CaF2 Crystals with Different Planes Irradiated by 355-nm Pulse Laser[J]. Chinese Journal of Lasers, 2019, 46(11): 1103001.