Author Affiliations
Abstract
1 College of Physics, Jilin University, Changchun 130012, China
2 State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
A 400 nm femtosecond laser was used to ablate the surface of a high-pressure and high-temperature diamond, and subwavelength surface micro structures with a period of 100 nm were achieved. A variety of micro-nano composite surface structures were prepared by changing the polarization direction and laser scanning direction. By dynamically adjusting the laser polarization and the laser scanning tracks, a maskless direct writing fabrication of micro-nano complex structures was realized. The micro-nano patterning on an ultra-hard and super-stabile diamond provides a new idea for the preparation of friction reducing surfaces, nano imprint transfer templates, surface enhanced Raman scattering test substrates, and micro-nano optical structures.
femtosecond laser diamond micro-nano structure Chinese Optics Letters
2020, 18(10): 101402
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100049
3 吉林大学物理学院, 吉林 长春 130000
针对目前光学口径不断增大的空间光学遥感器对实验室辐射定标的要求，设计了一种使用近距离小面源照明方式定标的高亮度积分球光源，并对该光源的光学参数和结构参数进行了详细设计。为了解决高亮度积分球使用时的散热问题，采用水冷的散热方式，设计了专门的散热管路。对该光源循环水流速0.1 m/s下利用有限元分析法热仿真分析，仿真结果表明，溴钨灯光源附近温度维持在125 °C 左右，积分球出光口温度维持在80 °C 左右。实验结果表明，溴钨灯光源附近温度维持在125 °C 左右，积分球出光口温度维持在100 °C 左右。通过对比分析了积分球出光口温度差异的原因，验证了仿真分析与理论计算的正确性。同时测试了该光源在400~900 nm 波段范围内光谱辐亮度为6714 W/(m2·sr)。
遥感 高亮度 水冷 光谱辐亮度
提出并证明了利用一个强相干驻波场，在一种四能级原子系统产生透射型电磁感应光栅并提高弱探测场交叉相位调制（XPM）及自相位调制（SPM）非线性的设想。探测脉冲的脉宽越短，产生相同相移所需的驻波场以及探测场的强度，与长脉冲或连续光相比需要的强度要大。由于相对传播的共振耦合场形成了驻波电磁感应光栅，探测场在近共振的另一强相干场的共同作用下，在具有大的非线性折射率的相干介质中透明地传播。探测脉冲在介质中传播的群速度受交叉相位调制以及自相位调制非线性调控。
非线性光学 量子相干 电磁感应光栅 色散 光学学报
2013, 33(11): 1119001
Author Affiliations
Abstract
College of Physics, Jilin University, Changchun 130023
The probe absorption spectrum of a four-level atom embedded in a double-band photonic crystal is discussed in this paper. The double V-type transitions from the two upper levels to the two lower levels interact with the free vacuum modes and the photonic band gap (PBG) modes synchronously. We investigate the quantum interferences in the probe absorption spectrum. And the new features of transparency are also predicted.
270.0270 Quantum optics 170.6280 Spectroscopy, fluorescence and luminescence 300.2530 Fluorescence, laser-induced 270.1670 Coherent optical effects Chinese Optics Letters
2005, 3(0s): 272
