Ultra-high-aperture dual-range gradient index-diffractive infrared objective

Greisukh, G.I., Levin, I.A., Ezhov, E.G.

For Russian citation (Opticheskii Zhurnal):

Грейсух Г.И., Левин И.А., Ежов Е.Г. Сверхсветосильный двухдиапазонный градиентно-дифракционный инфракрасный объектив // Оптический журнал. 2024. Т. 91. № 11. С. 34–42. http://doi.org/10.17586/1023-5086-2024-91-11-34-42

Greisukh G.I., Levin I.A., Ezhov E.G. Ultra-high-aperture dual-range gradient index-diffractive infrared objective [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 11. P. 34–42. http://doi.org/10.17586/1023-5086-2024-91-11-34-42

For citation (Journal of Optical Technology):

Abstract:

Subject of the study. A coaxially laminated optical material for a radial gradient index lens of an ultra-high-aperture infrared objective, as well as a dual-band infrared objective with such lens and a diffractive optical element. Purpose of the study. Modeling and calculation of an optical system with a coaxially laminated radial gradient lens. Demonstration of the potential capabilities of an ultra-high-aperture dual-band infrared lens consisting of two uniform and one radial-gradient lenses. The research method. Theoretical analysis, computer modeling and optimization using the ZEMAX optical design program. The main results. It is shown that the proposed infinitely thin model of a coaxially laminated radial gradient lens, which has the same optical power and longitudinal chromatism as its thick prototype, together with thin homogeneous lenses separated by air gaps, can be used as the initial design of the optical system being developed. Moreover, if the distribution of the a gradient lens refractive index is known, then the best combination of homogeneous lenses optical materials and the optical powers ratio of all elements of the circuit can be obtained from the conditions of achromatization, superachromatization or superchromatization by repeatedly solving the corresponding system of equations. The optical design, design parameters and optical characteristics of the calculated dual-band (3.5–5 and 8–11.9 μm) triplet, consisting of two uniform and one gradient lenses, are presented, demonstrating the effectiveness of the proposed approach and the possibility of achieving high optical characteristics for lenses of this type. Practical significance. The results of this study open up the possibility of creating, on the basis of the already developed special series of chalcogenide glasses, radial gradient lenses with such refractive index distributions that allow them to be used to achieve high optical performance in simple infrared objective.

Keywords:

composite gradient index material, coaxial laminated radial gradient index lens and its model, diffractive optical element, ultra-high-aperture dual-range gradient index-diffractive infrared objective

OCIS codes: 110.2760, 110.3080, 220.3620

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