Design of large relative aperture off-axis reflective system based on vector aberration theory

The off-axis reflective optical system exhibits characteristics such as the absence of chromatic aberration, a wide operational spectral range, suitability for large apertures, and a compact structure. These features significantly advance the development of space remote sensing technology. As application requirements continue to evolve, there is an increasing demand for space remote sensors to acquire optical remote sensing data that encompasses broader ranges and contains more detailed information. This trend imposes higher demands on technical parameters including imaging field of view, relative aperture, imaging quality, and energy integration of optical payloads. To address these challenges, this paper presents the design of an improved COOK off-axis five-mirror system. This was achieved through structural selection and direct design based on vector aberration theory applied to the initial structure of an unobscured off-axis reflective system. Following adjustments and optimization processes, the modulation transfer function of the designed optical system exceeds [email protected] lp/mm, while energy integration within a $48\mu \text{m}\times 48\mu \text{m}$ area surpasses 0.94. The imaging quality of the optical system is significantly improved, which meets the requirements of the system’s technical indicators. The designed system can achieve a large field of view, high energy utilization and low stray light simultaneously, which can greatly improve the design efficiency of the space optical system.