Design on long-wave infrared diffractive optical system

Weijun Chang; Ting Sun; Ke Zhou; Mingxuan Zhang; Xuanzhi Zhang

doi:10.1117/12.2662792

12 April 2023 Design on long-wave infrared diffractive optical system

Weijun Chang, Ting Sun, Ke Zhou, Mingxuan Zhang, Xuanzhi Zhang

Proceedings Volume 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022); 125652T (2023) https://doi.org/10.1117/12.2662792
Event: Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 2022, Shanghai, China

Abstract

The abbe number of diffractive optical element is negative, which is opposite to that of traditional refraction optical element. So diffractive optical element has unique advantages on achromatic and thermal compensation. Therefore, it can be applied to diffractive and refraction hybrid optical systems to simplify the optical structure and improve the imaging quality. However, the diffraction efficiency of the single-layer diffractive optical element depends on the wavelength mightily , However, the diffraction efficiency of the design order of the double-layer diffractive optical element in the whole working band is coincident basically and more than 90%, which can significantly suppress the stray light of the non-design order and advance the image contrast. Therefore, the double-layer diffractive optical elements are adopted in this long-wave infrared wide waveband optical system, and the design idea of superposing the diffractive surface on the aspheric surface is proposed. Only two lenses and two materials were used to realize the optimal design. By matching the microstructure parameters of the double-layer diffractive elements ,the diffraction efficiency of the whole working band reached more than 97%. Imaging quality analysis shows that the chromatic aberration of 8μm-14μm is well corrected. the secondary spectrum is well controlled also, and the MTF is close to the diffraction limit, which meets the design requirements.

Citation Download Citation

Weijun Chang, Ting Sun, Ke Zhou, Mingxuan Zhang, and Xuanzhi Zhang "Design on long-wave infrared diffractive optical system", Proc. SPIE 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 125652T (12 April 2023); https://doi.org/10.1117/12.2662792

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KEYWORDS

Diffraction

Design and modelling

Optical surfaces

Infrared imaging

Diffractive optical elements

Chromatic aberrations

Imaging systems

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