Modeling and investigation of the combination of passive athermalization and achromatization in a two-component bifocal zoom objective in the infrared range of the spectrum

For Russian citation (Opticheskii Zhurnal):

Левин И.А., Грейсух Г.И. Моделирование и исследование совмещения пассивной атермализации и ахроматизации у двухкомпонентного бифокального вариообъектива в инфракрасном диапазоне спектра // Оптический журнал. 2025. Т. 92. № 2. С. 96–105. http://doi.org/10.17586/1023-5086-2025-92-02-96-105

Levin I.A., Greisukh G.I. Modeling and investigation of the combination of passive athermalization and achromatization in a two-component bifocal zoom objective in the infrared range of the spectrum [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 2. P. 96–105. http://doi.org/10.17586/1023-5086-2025-92-02-96-105

For citation (Journal of Optical Technology):

Abstract:

Subject of the study. A model of a two-component three-lens bifocal zoom objective that allows combining achromatization and athermalization by a passive method. Purpose of the study. To present the results of the analysis of the design parameters and optimal combinations of optical materials of the two-component bifocal zoom objective model, ensuring the achievement of achromatization and athermalization, performed using the developed mathematical apparatus and the methodology based on it. The research method. Theoretical analysis and mathematical modeling using geometric optics equations. The main results. A mathematical apparatus and the methodology based on it have been developed for the model of a two-component bifocal zoom objective, which makes it possible to obtain the optimal combination of optical materials and structural material in the air gap between the components, as well as the values of the optical power of the lenses and the air gaps between them, providing chromatic correction while simultaneously achieving athermalization by a passive optical or mechanical method. Using the developed methodology, it is shown that the nomenclature of optical materials transparent in a wide range of the infrared spectrum makes it possible to design high-power bifocal zoom objective-achromats, athermalized by the passive method. The possibility of changing the thermal refocusing value over a wide range without significantly affecting the value of the thermal refocusing difference corresponding to two focal length values of a two-component bifocal zoom objective is demonstrated. Practical significance. The presented methodology makes it possible to obtain the design parameters of the initial optical lay out at the initial stage of designing a bifocal zoom objective-achromate athermalized by the passive method.

Keywords:

infrared radiation, zoom objective, passive athermalization

Acknowledgements:

the investigation was carried out as part of the implementation of the state task of the Ministry of Science and Higher Education of the Russian Federation № FSGS-2024-0005

OCIS codes: 080.2740, 080.3630, 110.3080, 160.4670

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