Electro-Optic Technology Application, Volume. 40, Issue 3, 24(2025)
Design of 10× Hybrid Refractive-diffractive Infrared Continuous Zoom Optical System
According to the application requirements of 640×512 uncooled long-wave infrared detectors, a hybrid refractive-diffractive continuous zoom optical system with a focal length of 20~200 mm is designed using the dispersion characteristics of diffraction optical elements. The positive compensation structure is used to achieve 10× optical zoom, and the image quality is improved by introducing even aspherical and binary diffraction surfaces. The zoom curve analysis and image quality evaluation are performed according to the design results. The full field of view modulation transfer function at the spatial frequency of 40 lp/mm is greater than 0.3, closed to the diffraction limit, and the short focal end distortion control is less than 4%. The results show that the system has large relative aperture, good imaging quality and smooth zoom curve, and can be widely used in infrared continuous zoom thermal imager products.
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XU Yuhui, GUO Ning, LI Xianshuai. Design of 10× Hybrid Refractive-diffractive Infrared Continuous Zoom Optical System[J]. Electro-Optic Technology Application, 2025, 40(3): 24