Browse > Article
http://dx.doi.org/10.3807/KJOP.2022.33.6.287

Design of a 10× Zoom Lens with an Expander for an MWIR Camera Using Athermal Material Composition Method  

Ryu, Tae-Sik (Department of Physics, Dankook University)
Park, Sung-Chan (Department of Physics, Dankook University)
Publication Information
Korean Journal of Optics and Photonics / v.33, no.6, 2022 , pp. 287-294 More about this Journal
Abstract
This study presents a method for designing an athermal middle wavelength infrared (MWIR) zoom lens with the iterative selection of material compositions on an athermal glass map. The optical properties of glass for MWIR are generally very sensitive to temperature, compared with visible glass. To compensate for focus error due to temperature change, the non-athermalized zoom system requires a large amount of movement of a compensator, which results in an unstable zoom system. To solve this problem, the material compositions for an athermal zoom lens have effectively been obtained using the thermal aberration correction process analytically on an athermal glass map. An expander lens is used to enlarge the focal lengths of an original main zoom lens two times. Finally, while this expander is attached to an original athermal zoom system, the final zoom system equipped with this expander doubles the focal length ranges and has stable performance over a specified temperature range.
Keywords
Aberration; Athermalization; Glass map; Infrared; Zoom lens;
Citations & Related Records
연도 인용수 순위
  • Reference
1 T. H. Jamieson, "Thermal effects in optical systems," Opt. Eng. 20, 202156 (1981).   DOI
2 A. Daniels, Field Guide Infrared System (SPIE Press, USA, 2006), Volume FG15, pp. 8-120.
3 Y. Tamagawa and T. Tajime, "Expansion of an athermal chart into a multi-lens system with thick lenses spaced apart," Opt. Eng. 35, 3001-3006 (1996).   DOI
4 T. S. Ryu and S. C. Park, "Achromatic and athermal design using cost-effective glass selection and aberration-corrected point matching on a glass map," Appl. Opt. 60, 3013-3020 (2021).   DOI
5 M. S. Yun, T. S. Ryu, and S. C. Park, "Design of an expander lens for an MWIR zoom camera using the third-order aberration analysis," Proc. SPIE 12217, 122170Y (2022).
6 T. Y. Lim, K. H. Kim, and S. C. Park, "Material selection for an achromatic and athermal design using the factor of determination on optical glasses," Proc. SPIE 11104, 111040R (2019).
7 X. D. Dang, D. C. Que, M. A. Hoang, V. T. Vu, and T. D. Vu, "High magnification MWIR continuous zoom system," U.S. Patent 20200201005A1 (2020).