Author Affiliations
Abstract
1 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
This Letter presents an optical design method based on the Seidel aberration theory for dynamic refocus systems. The function of a dynamic refocus system is to increase the amount of return photons when a pulsed laser travels over an extended height range. In this study, the dynamic refocus system is a short focal image system. The aberrations of the dynamic refocus system are calculated individually. Aplanatic lenses are used to eliminate the main spherical aberration. A field lens is used to change the stop position in order to eliminate comas and astigmatism. The effectiveness of the initial design results are confirmed, and the designed dynamic refocus objective with an aperture of F-number 0.98 and a focal length of 14.325 mm is achieved. The total motion of the dynamic refocus mirror is approximately 216 μm at heights that ranged from 8 to 18 km. The optimum result shows that the dynamic refocus system is an ideal optical image system at each conjugating height with 10 km sample thicknesses.
350.1260 Astronomical optics 010.7060 Turbulence 220.4830 Systems design Chinese Optics Letters
2016, 14(4): 042202
1 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室, 吉林 长春 130033
2 中国科学院大学, 北京 100049
3 中国科学院长春光学精密机械与物理研究所,中国科学院光学系统先进制造技术重点实验室, 吉林 长春 130033
4 中国科学院长春光学精密机械与物理研究所,光栅技术实验室, 吉林 长春 130033
增加激光导星的散射层采样厚度可以提高波前探测器的探测能量,但是存在探测光斑弥散问题.针对该问题,分析并设计了动态聚焦系统.首先分析了采样厚度对波前探测能量的影响,结果显示,波前探测能量随着采样厚度非线性增大,当采样厚度为4 km、激光脉冲能量为10 mJ时,望远镜子孔径接收到的光子数为120,满足探测精度要求.然后分析了光斑弥散对波前探测精度的影响,当采样厚度为4 km 时,波前探测误差约为0.5 λ,探测误差较大.为了实现精确探测,依据分析结果设计了动态聚焦系统,将聚焦反射镜的移动距离由111 mm 缩小到100 μm、移动速度由4200 m/s降低到3.8 m/s,满足应用需求.最后利用Zemax软件进行优化,结果表明,对于4 km采样厚度,光学系统均能实现理想成像.
光学设计 自适应光学 动态聚焦系统 激光导星
