Athermalization of infrared continuous zoom optical system based on wavefront coding

Kai Jiang; Er-Rui Chen; Liang Zhou; Kai Liu; Jing Duan; Quisha Shan

doi:10.1117/12.2666470

4 April 2023 Athermalization of infrared continuous zoom optical system based on wavefront coding

Kai Jiang, Er-Rui Chen, Liang Zhou, Kai Liu, Jing Duan, Quisha Shan

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 1261759 (2023) https://doi.org/10.1117/12.2666470
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

Wavefront coding is a technology which combination of the optical design and digital image processing. By inserting a phase mask closed to the pupil plane of the continuous zoom optical system, the wavefront of the system is re-modulated. And the depth of focus is extended consequently. In reality the idea is same as the athermalization theory of infrared optical system. In this paper, an uncooled infrared continuous zoom optical system with effective focal as 38mm～19mm, F number as 1.2, operating wavelength varying from 8μm to 12μm was designed. A cubic phase mask was used at the pupil plane to re-modulate the wavefront. Then the performance of the infrared continuous zoom system was simulated with CODEV as the environment temperature varying from -40℃ to 60℃. MTF curve of the optical system with phase mask are compared with the traditional before using phase mask. Decode the image of the coding system, and the result show that wavefront coding technology can make the system not sensitive to thermal defocus, and then realize the athermal design of the infrared optical system.

Citation Download Citation

Kai Jiang, Er-Rui Chen, Liang Zhou, Kai Liu, Jing Duan, and Quisha Shan "Athermalization of infrared continuous zoom optical system based on wavefront coding", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 1261759 (4 April 2023); https://doi.org/10.1117/12.2666470

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