| Citation: | JIANG Yang, MU Quan-quan, ZHAO Dong-xu, SHI Yi-jun, HUO Dong-yang. Optical design of lightweight laser seeker for semi-active guided[J]. Chinese Optics. doi: 10.37188/CO.2024-0229
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In order to minimize misalignment angle errors in laser-guided seekers, we have optimized the quality of energy signals through advanced optical design techniques. The initial design parameters were derived by integrating aberration theory with sophisticated optical design software. We then employed an iterative design process for the optical system, focusing on both the optimization of the optical structure and the balance of aberrations. To enhance angular measurement precision, we improved the symmetry of the light spot by carefully controlling the image-side telecentric condition. Furthermore, a comprehensive performance analysis of optical plastic materials demonstrated the viability of using these materials in the manufacture of the seeker’s optical structure. Our final optical system design boasts a focal length of 71.6mm and an F/# of 1, with the edge field chief ray telecentric maintained below 6mrad. In the operating temperature range, the stability of spot size is better than 0.4% and the maximum distortion of the full field of view is less than 0.5%. Notably, within a ±2° field of view, both the light spot linearity and energy response consistency meet the stringent requirements for precision guidance. The structural design methodology we employed, which focuses on minimizing primary aberrations, can be effectively applied to the optimization of catadioptric systems, thus serving as a valuable reference for the optical structure design of similar seekers.
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