光学学报, 2019, 39 (10): 1022001, 网络出版: 2019-10-09   

基于Q-type非球面的双波段红外光学系统设计 下载: 1135次

Design of Dual-Band Infrared Optical System with Q-type Asphere
作者单位
长春理工大学光电工程学院, 吉林 长春 130022
摘要
设计了一个可同时在3~5 μm中波红外(MWIR)和8~11 μm长波红外(LWIR)成像的非制冷双波段红外光学系统。该系统由4片透镜组成,有效焦距为21 mm,F数为2.6,其中第4表面为Q-type非球面,透镜材料采用Ge和Ge10As40Se50硫系玻璃,对系统进行优化设计使之达到无热化效果。设计结果显示此系统在-40~60 ℃范围内成像质量良好,调制传递函数接近衍射极限。在设计参数和初始结构相同的情况下,设计了一个包含偶次非球面的光学系统,并对这两种光学系统进行比较分析。结果表明:Q-type非球面在光学系统设计过程中具有较大优势,其校正像差的能力更强,面形与最佳拟合球面的偏离量更小,有利于提高加工精度和效率。
Abstract
We design an uncooled dual-band infrared optical system whose operating wavelengths include 3-5-μm mid-wave infrared and 8-11-μm long-wave infrared wavelengths. The effective focal length of this system is 21 mm, and the F-number is 2.6. The system comprises four lenses fabricated with germanium and chalcogenide glass (Ge10As40Se50), and the fourth surface is a Q-type asphere. The system is optimized to achieve athermal effect. The design result shows excellent image quality in the temperature range of -40-60 ℃; additionally, the modulation transfer function is close to the diffraction limit. We design an optical system with an even asphere and the same initial parameters and structure. By comparing, we find that the Q-type asphere has more advantages in optical system design: its stronger ability to correct aberration and smaller deviation from the best-fit sphere are conducive to improving fabrication accuracy and efficiency.

贾孟, 薛常喜. 基于Q-type非球面的双波段红外光学系统设计[J]. 光学学报, 2019, 39(10): 1022001. Meng Jia, Changxi Xue. Design of Dual-Band Infrared Optical System with Q-type Asphere[J]. Acta Optica Sinica, 2019, 39(10): 1022001.

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