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Active athermalization of dual-infrared zoom lenses
G.I. Greisukh 1, I.A. Levin 2, S.V. Kazin 1

1 Penza State University of Architecture and Construction, Penza, Russia,
2 PJSC "Krasnogorsky Zavod", Krasnogorsk, Russia

 PDF, 779 kB

DOI: 10.18287/2412-6179-CO-775

Pages: 931-936.

Full text of article: Russian language.

Abstract:
For medium- and long-wavelength dual-band infrared refractive and refractive-diffractive thermal imaging zoom lenses of simple design, we show that it is possible to maintain superb and practically unchanged optical characteristics across the temperature range from –40 to +40°C in the entire range of focal length variation. Athermalization for any focal length is achieved by moving one double-lens component or a single lens along the optical axis of the lens. Considering that these optical components are not involved in the zooming process, it becomes possible to both compensate for thermal defocusing and focus the lens on the object of interest using the same focusing mechanism, while maintaining the size and tightness of the optical system.

Keywords:
dual-infrared range, refractive and refractive-diffractive zoom lens, active athermalization.

Citation:
Greisukh GI, Levin IA, Kasin SV. Active athermalization of dual-infrared zoom lenses. Computer Optics 2020; 44(6): 931-936. DOI: 10.18287/2412-6179-CO-775.

Acknowledgements:
The study was funded by a grant from the Russian Science Foundation (Project No. 20-19-00081).

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