Author Affiliations
Abstract
State Key Laboratory of Precision Measurements Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Freeform surfaces are difficult to manufacture due to their lack of rotational symmetry. To reduce the requirements for manufacturing precision, a design method is proposed for freeform reflective-imaging systems with low surface-figure-error sensitivity. The method considers both the surface-figure-error sensitivity and optical specifications, which can design initial systems insensitive to surface figure errors. Design starts with an initial planar system; the surface-figure-error sensitivity of the system is reduced during construction. The proposed method and another that is irrelevant to figure-error sensitivity are used to design a freeform off-axis three-mirror imaging system. Comparison of the sensitivities of the two systems indicates the superiority of our proposed method.
220.4830 Systems design 080.4228 Nonspherical mirror surfaces 220.4610 Optical fabrication 080.4035 Mirror system design Chinese Optics Letters
2019, 17(9): 092201
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 长春理工大学 光电工程学院, 吉林 长春 130022
4 吉林大学 机械科学与工程学院, 吉林 长春 130022
5 吉林亚泰中科医疗器械工程技术研究院股份有限公司, 吉林 长春 130000
为了实现高斯圆斑向平顶线斑的转化, 提出了一种用于高斯光束整形的三反射镜光学系统。利用环形面对两个相互垂直方向的光线会聚、发散作用不同, 标准球面具有旋转对称性质, 以及二次曲面系数、非球面系数可以实现高斯分布转化为平顶分布的原理, 采用ZPL语言与自动优化结合的方法完成了系统设计。设计得到了一个方向平顶的矩形光斑以及平顶线斑, 整形效果良好, 并结合在光学相干层析(OCT)系统中对样品照明或扫描的实际要求, 通过小角度(±2°)旋转系统第一个反射镜对所得线斑进行扫描, 在扫描角度内可以实现线性扫描(扫描范围约为10 mm×11 mm)。结果表明, 该三反射镜系统满足轻量化、结构紧凑、不受工作波长影响的要求, 是一种可行、有效的方案。
光学系统设计 光学相干层析 激光光束整形 反射镜系统设计 optical system design optical coherence tomography laser beam shaping mirror system design 光学 精密工程
2018, 26(11): 2654
Author Affiliations
Abstract
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
In this Letter, we propose a novel configuration and design method of freeform, dual fields-of-view (FOVs), dual focal lengths, off-axis three-mirror zoom imaging systems. The switch of the two zooms is achieved by rotating a single mirror element. The design of a freeform, dual focal lengths zoom system is realized by a point-by-point design approach for the first time to our knowledge. This method enables the direct design of freeform surfaces from initial planes using given system specifications and configuration, and the designed system can be taken as a good starting point for further optimization. A freeform, dual FOVs, dual focal lengths, off-axis three-mirror zoom system is demonstrated. The F-numbers of the two zooms are 2 and 2.4. The dual FOVs are 3°×3° and 2.5°×2.5°. After final optimization, both of the zooms achieve high performances.
080.4228 Nonspherical mirror surfaces 080.4035 Mirror system design 220.2740 Geometric optical design Chinese Optics Letters
2016, 14(10): 100801
Author Affiliations
Abstract
School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
Stray light analysis of a three-mirror spatial optical system is presented. The entrance pupil diameter (EPD) of the system is 320 mm, the e?ective focal length (EFL) is 2809 mm, and the field of view (FOV) is 1°×0.5°. Its walls are coated with extinction paint (the absorption coeffcient of which is 97%). The point source transmittance (PST) of the system is thus reduced by up to two orders of magnitude. Moreover, this technique makes it feasible to block the stray light coming from outside of the FOV by increasing the outer baffle length of the system. Adding an inner baffle to both the primary and the secondary mirrors helps not only to block the stray light coming from outside of the FOV but also to decrease the length of the outer baffle. Simulation results show that the PST values are less than 10-10 when the off-axis angle is larger than 9°. The stray light is also suppressed effectively by placing a glare stop at the first imaging plane of Cassegrain telescope. It is surprising that the PST value is 10-14 when the off-axis angle is 2° with the placement of glare stop at the first image plane.
空间光学 杂散光 光线追迹 同轴三反 080.4035 Mirror system design 290.1483 BSDF, BRDF, and BTDF 290.2200 Extinction 290.2648 Stray light Chinese Optics Letters
2010, 8(6): 569
