The Spectral Telescope Based On Fresnel Diffraction

Diffractive optics is a new field of modern optics and it has wide application prospect.Using diffraction optical principle and traditional optical design method to design a spectral telescope based on Fresnel diffraction. The spectral telescope based on Fresnel diffraction can break the limit of refraction/reflection telescope system. It has very important significance to improve the quality of the telescope image, optimize the structure of the telescope system and reduce the cost of the telescope design.In the first chapter, the research progress of telescope and diffractive optics is summarized. Based on this, put forward the design idea of add Fresnel optical lens in telescopic system, confirm the research direction and significance of this paper.In the second chapter, introduction the basic theory of diffractive optics and the design feature of the Fresnel optical lens, using the PWC method to design the spectral telescope based on Fresnel diffraction.In the third chapter, according to the design method of the traditional reflective telescope and the optical characteristics of the Fresnel optical lens to design a telescopic optical system. It has caliber 300 mm,focal length 2000 mm,resolution 200 line,maximum field of view 0.3.In the fourth chapter, design a spectrometer system to collect spectral information. The spectral range 400~800nm, spectral resolution 1.1×103(can resolution spectral information of 5nm), the maximum energy transfer is 83.8%.In the fifth chapter, through the relative spectral intensity simulation HPML, verify the spectral telescope system design is accurate and feasible.