Abstract

Using of diffractive optical elements (DOE) in the Schupmann system offer a new way for the construction of ultra-large aperture telescope. The Fresnel Corrector, one of the DOEs, is the key device in the Schupmann system, which is used to correct the chromatic aberration introduced by the diffractive primary lens called Magnifying Glass. Generally, in a large aperture telescope (>20 m), the Fresnel Corrector is a diffractive lens with a large aperture and a small f-number, which is difficult to process. In this article, an improved device with a small F number but a large rim feature size, called amplitude and phase hybrid modulation Fresnel diffractive optical element (APHMFDOE), is used here as the Fresnel corrector. First, APHMFDOE with appropriate parameters is designed to match the dispersion of the Magnifying Glass so that the system meets the achromatic condition. Second, the optical characteristics of this improved system are simulated and compared with those of the general system based on the conventional Fresnel corrector. Our approach introduces a new dispersion correction device, which not only can eliminate the chromatic aberration caused by Magnifying Glass, but also can reduce the processing difficulty of Fresnel Corrector.

Highlights

  • Using of diffractive optical elements (DOE) in the Schupmann system offer a new way for the construction of ultra-large aperture telescope [1] [2]

  • We have studied the theoretical design and simulation process of an amplitude and phase hybrid modulation Fresnel diffractive optical element (APHMFDOE), which is generated by adding a diffraction phase profile to the transparent band of the AFZP

  • The results showed that APHMFDOE can increase the feature size of the diffractive element without changing its F-number [3]

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Summary

Introduction

Using of diffractive optical elements (DOE) in the Schupmann system offer a new way for the construction of ultra-large aperture telescope [1] [2]. In a large aperture telescope (>20 m), the diameter of the Fresnel Corrector is close to 1 m, while the F number of the Fresnel corrector is close to 1. We have studied the theoretical design and simulation process of an amplitude and phase hybrid modulation Fresnel diffractive optical element (APHMFDOE), which is generated by adding a diffraction phase profile to the transparent band of the AFZP. The results showed that APHMFDOE can increase the feature size of the diffractive element without changing its F-number [3]. We consider using it as the Fresnel Corrector

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