Citation: | He Chuanwang, Wang Lihua, Huang Peng, et al. Design of diffractive imaging optical system based on off-axis four-mirror[J]. Opto-Electronic Engineering, 2019, 46(11): 190099. doi: 10.12086/oee.2019.190099 |
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Overview: The most effective way to improve the resolution of space optical telescope is to enlarge the aperture. With the increase of aperture, it has become increasingly difficult for traditional reflective space telescope system considering manufacturing technology, the ability to launch and space expansion as well as adjustment technology. Furthermore, considering the support and control structure, the weight of optical telescope system is proportional to the square of aperture. As a result, the control becomes more complex and the cost of optical system is increasing rapidly. Compared with the reflective telescope optical system, diffractive imaging system based on the thin film material as the objective lens can achieve large diameter, high resolution, light weight structure, space packagable and deployable, loose tolerance and so on. Diffractive imaging technology can save launch and manufacturing costs significantly, and has great potential applications in the field of high orbit high-resolution imaging. The existing eyepiece systems of diffractive telescopes mostly use refractive structure, but it can hardly meet the requirements of large aperture space optical telescope in terms of complexity and quality. The reflective eyepiece system has obvious advantages of high image quality, light weight and wide waveband because of its non-chromatic aberration and deflection of optical path. To realize an off-axis reflective diffractive imaging optical system with broadband and compact structure, we analysis the basic principle of diffractive imaging optical system. According to the Schupmann’s achromatic theory, a calculation method of off-axis four-mirror diffractive imaging optical system is introduced. By using the method, an optical system which has an aperture of 1 m, F-number of 8, waveband of 582.8 nm~682.8 nm and the full field of view of 0.12° is designed. The results show that the chromatic aberration is corrected effectively. The modulation transfer function (MTF) of the full field of view is more than 0.53 in the range of 50 lp/mm, the RMS radius of diffusion spot is less than the airy radius. It demonstrates that the image quality of system is close to the diffraction limit. It is analyzed that the processing of diffractive primary lens and diffractive correct mirror can be realized by traditional lithography and diamond turning, respectively. Monte-Carlo simulation of tolerance analysis is carried out, it determined that the tolerance error mainly originate from the tilt angle of relay mirror, which provides guidance for the process of assembling and adjusting. This system has the advantages of broadband, short optical path, ideal obscuration, which can provide references for the development of reflective diffractive imaging optical system.
Diffractive optical element dispersion
Concept of diffractive imaging optical system
Structure of diffractive imaging optical system based on off-axis four-mirror
Focal shift of 100 nm wavelength for diffractive primary lens
Focal shift of 100 nm waveband for optical system
MTF curve of optical system
Spot diagram of optical system
Lateral color curve
Field curvature and distortion
Phase and line frequency versus aperture of diffractive primary lens
Phase and line frequency versus aperture of diffractive correct mirror