Author Affiliations
Abstract
1 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
In order to improve the damage threshold and enlarge the aperture of a laser beam shaper, photolithographic patterning technology is adopted to design a new type of liquid crystal binary mask. The inherent conductive metal layer of commercial liquid crystal electro-optical spatial light modulators is replaced by azobenzene-based photoalignment layers patterned by noncontact photolithography. Using the azobenzene-based photoalignment layer, a liquid crystal binary mask for beam shaping is fabricated. In addition, the shaping ability, damage threshold, write/erase flexibility and stability of the liquid crystal binary mask are tested. Using a 1 Hz near-IR (1064 nm) laser, the multiple-shot nanosecond damage threshold of the liquid crystal mask is measured to be higher than $15~\text{J}/\text{cm}^{2}$. The damage threshold of the azobenzene-based photoalignment layer is higher than $50~\text{J}/\text{cm}^{2}$ under the same testing conditions.
high damage threshold laser beam shaper liquid crystal photoalignment High Power Laser Science and Engineering
2019, 7(1): 010000e9
1 四川大学电子信息学院,四川 成都 610064
2 中国科学院光电技术研究所,四川 双流 610209
报道了氟化氘(DF)激光器腔镜的膜系设计、材料选取、制备工艺及其损伤阈值和热畸变测试结果,实验结果表明,镜面在21 kW/cm2功率密度下的热畸变为0.3λ左右(λ=632.8 nm),腔镜的损伤阈值大于40 kW/cm2.
激光技术 DF激光器 薄膜 高反射率 高损伤阈值 热畸变
1 四川大学电子信息学院, 成都 610064
2 中国科学院光电技术研究所, 双流 610209
采用ΖnS/YbF3五层膜系结构镀制了CaF2窗口在3.4～4.2 μm波长范围的红外宽带增透膜,光谱测试结果 表明平均透过率在99%以上,该膜层能承受200 kW的激光功率输出。
DF化学激光器 CaF2窗口 宽带增透膜 高损伤阈值
