Experimental demonstration of a Gabor zone-plate hologram for Space Exoplanet Telescope

Mei-Li Hsieh; Thomas D. Ditto; Shawn-Yu Lin

doi:10.1117/12.2561512

13 December 2020 Experimental demonstration of a Gabor zone-plate hologram for Space Exoplanet Telescope

Mei-Li Hsieh, Thomas D. Ditto, Shawn-Yu Lin

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114515N (2020) https://doi.org/10.1117/12.2561512
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

A novel telescope, The Dual Use Exoplanet Telescope (DUET), is designed to directly take spectra of an exoplanet with extremely high resolution spectroscopy based on the primary objective --- a lightweight annular Gabor Zone-Plate (GZP). The zone-plate functions as a converter that transforms incident starlight directly into a spectrogram. In this paper, we will present the design of an annular GZP hologram based on the interference of two spherical waves. We will show, through an analytical solution, that the focal-length of the zone-plate can be tailored by tuning the radius-ofcurvature of the two spherical waves. The grating period of the GZP hologram is variable and decreasing from center to outer region, which brings the incoming star-light to focus. A desirable focal-length and the spherical symmetry of a zone-plate hologram will result in an unusual on-axis dispersive behavior of the incoming star-light. Furthermore, the preliminary laboratory tests of the GZP hologram will be presented. We will illustrate a successful implementation of a scale model optical system for realizing such a telescope GZP-hologram. Particularly, we will demonstrate that a GZPhologram can achieve a spectral dispersion of =430-650nm over an on-axis distance of 19cm.

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Mei-Li Hsieh, Thomas D. Ditto, and Shawn-Yu Lin "Experimental demonstration of a Gabor zone-plate hologram for Space Exoplanet Telescope", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114515N (13 December 2020); https://doi.org/10.1117/12.2561512

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