Design of three-lens athermalized and cooled midwave infrared objective

Zhang Ying; Ding Xuezhuan; Yang Bo; Zhang Zongcun; Liu Yinnian

doi:10.3788/IRLA201645.0418005

Infrared optical systems usually work at a large temperature range due to complex environment. Method of designing three-lens athermalized infrared objective has been introduced. The location of three-lens objective stop was changed to achieve 100% cold stop efficiency. This structure was combined with athermalization model to deduce distribution of the initial focal power. Method of lens materials selection was also given. An example of infrared objective with a 88 mm focal length was designed by this principle. Its wavelength range is 3-5 m and F number is 2.0. The objective has a perfect image quality. The RMS spot diameter is less than 5 m, while the MTF reach 0.75@17 lp/mm. The focal length, focal plane and image quality keep steady at temperature range from -20℃ to +70℃ which shows the feasibility of the design method.

Design of three-lens athermalized and cooled midwave infrared objective

1. Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China

Received Date: 2015-08-11

Rev Recd Date: 2015-09-03

Publish Date: 2016-04-25

Key words:

Abstract: Infrared optical systems usually work at a large temperature range due to complex environment. Method of designing three-lens athermalized infrared objective has been introduced. The location of three-lens objective stop was changed to achieve 100% cold stop efficiency. This structure was combined with athermalization model to deduce distribution of the initial focal power. Method of lens materials selection was also given. An example of infrared objective with a 88 mm focal length was designed by this principle. Its wavelength range is 3-5 m and F number is 2.0. The objective has a perfect image quality. The RMS spot diameter is less than 5 m, while the MTF reach 0.75@17 lp/mm. The focal length, focal plane and image quality keep steady at temperature range from -20℃ to +70℃ which shows the feasibility of the design method.

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Reference (10)

[1]	Gao Duorui, Fu Qiang, Zhao Zhao, et al. Athermalized telephoto objective design for 8-12m infrared wavelength[J]. Infrared and Laser Engineering, 2014, 43(11):3838-3039. (in Chinese)高铎瑞, 付强, 赵昭, 等. 摄远型红外8-12m波段消热差物镜设计[J]. 红外与激光工程, 2014, 43(11):3838-3039.
[2]	Meng Qingchao, Pan Guoqing, Zhang Yunqiang, et al. Design of athermalizing infrared optical system[J]. Infrared and Laser Engineering, 2008, 37(S2):723-725. (in Chinese)孟庆超, 潘国庆, 张运强, 等. 红外光学系统的无热化设计[J]. 红外与激光工程, 2008, 37(S2):723-725.
[3]	Liu Lin, Chen Xinhua, Shen Weimin. Development of an athermalizationmidwave infrared telescopic-objective with fast speed[J]. Optical Technique, 2011, 37(4):418-421. (in Chinese)刘琳, 陈新华, 沈为民. 消热差大相对孔径中波红外望远物镜的研制[J]. 光学技术, 2011, 37(4):418-421.
[4]	Chang Hong. Research on key techniques of thermo-optical stability for refractive infrared system[D]. HarBin:Harbin Institute of Technology, 2011. (in Chinese)常虹. 透射式红外系统热光学稳定性关键技术研究[D]. 哈尔滨:哈尔滨工业大学, 2011.
[5]	Zhang Xin, Jia Hongguang. Optical design of infrared athermalized objective with large relative aperture[J]. Chinese Optics, 2011, 4(4):375-376. (in Chinese)张鑫, 贾宏光. 大相对孔径红外消热差物镜设计[J]. 中国光学, 2011, 4(4):375-376.
[6]	Yu Linyao, Wei Qun, Zhang Xin, et al. Design of compact integral structure of two-mirror system[J]. Optics and Precision Engineering, 2013, 21(3):562-563. (in Chinese)虞林瑶, 魏群, 张鑫, 等. 一体式紧凑型折反光学系统设计[J]. 光学精密工程, 2013, 21(3):562-563.
[7]	Zhang Xin, Jia Hongguang, Zhang Yue. Optical design of athermalized infrared telephoto objective[J]. Infrared and Laser Engineering, 2012, 41(1):178-183. (in Chinese)张鑫, 贾宏光, 张跃. 远距型红外消热差物镜设计[J]. 红外与激光工程, 2012, 41(1):178-183.
[8]	Wu Xiaojing, MengJunhe. Approach of athermalizing infrared optical systems[J]. Infrared and Laser Engineering, 2003, 32(6):573-574. (in Chinese)吴晓靖, 孟军和. 红外光学系统无热化设计的途径[J]. 红外与激光工程, 2003, 32(6):573-574.
[9]	Bai Yuzhuo, Mu Rui, Ma Lin, et al. Design of infrared optical system with super-long focal length and dual field-of-view[J]. Chinese Optics, 2014, 7(4):632-633. (in Chinese)白玉琢, 木锐, 马琳, 等. 超长焦距红外双视场光学系统设计[J]. 中国光学, 2014, 7(4):632-633.
[10]	Cui Jicheng. Design of large aperture refractive zoom lens[J]. Optics and Precision Engineering, 2008, 16(11):2087-2088. (in Chinese)崔继承. 大口径折反射式变焦距物镜的设计[J]. 光学精密工程, 2008, 16(11):2087-2088.

Design of three-lens athermalized and cooled midwave infrared objective

doi: 10.3788/IRLA201645.0418005

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