1 中国科学院上海光学精密机械研究所高功率激光物理重点实验室，上海 201800
2 中国科学院大学材料与光电研究中心，北京 100049
采用溶胶凝胶法制备得到以正丙醇锆和正硅酸乙酯为前驱体的ZrO2和SiO2溶胶，通过TFCalc光学薄膜软件模拟了ZrO2/SiO2三层“宽M型”基频二倍频减反膜，并使用提拉法制备得到了该均匀膜层。三层减反膜在527 nm和1053 nm处的透过率约为99.5%，且透过率大于99%的波长范围均超过150 nm。经热处理后的膜层表面均方根粗糙度为1.34 nm，表面平整性良好；并运用1-on-1激光损伤阈值测试方法测得该减反膜的零几率激光损伤阈值达到36.8 J·cm-2（1064 nm，10.7 ns）。
材料 溶胶凝胶 减反膜 ZrO2/SiO2 双波长 光学学报
2023, 43(11): 1131001
Author Affiliations
Abstract
School of Physics and Opto-Electronics Engineering, Ludong University, Yantai 264025, China
We propose a metalens for coaxial double wavelength focusing. One focusing spot is a circular solid spot, and the other focusing spot is a doughnut-shaped spot that is circling the solid spot. The designed metalens was composed of a meta-molecular nanostructured cell array. Each meta-molecular nanostructured cell was divided into four squares. Two slots with exactly the same shape, but usually with the rotation angle measured clockwise from the positive x axis, are etched into the gold film in two diagonally connected squares. Another two slots with the same shape but with the rotation angle measured counter-clockwise from the positive x axis are etched into another two diagonally connected squares in the same cell. The lasers with two different wavelengths are transformed into right-handed and left-handed circularly polarized beams, respectively. The two sets of slots with different azimuthal rotations modulated the phases of incident right-handed and left-handed circularly polarized beams independently. The numerical simulation with finite-difference time-domain (FDTD) software was carried out, and the experimental verification was also implemented. Both the experimental result and the numerical simulation agree well with the theoretical design.
metalens coaxial focusing double wavelengths Chinese Optics Letters
2020, 18(4): 042401
中国科学院上海光学精密机械研究所,上海 201800
研究了放电管尺寸为φ28×980 mm的金蒸气激光器627.8 nm和312.2 nm波长的受激发射.应用新型谐振腔,可以同时获得红光和紫外两个波长的激光,当红光的激光输出为2.3 W时,紫外312.2 nm平均输出功率为300 mW,输出光束直径为28 mm,两个波长激光的发散度为3 mrad.
金蒸气激光器 双波长输出
