Development of high-efficiency reflective grating by holographic processing for UV exoplanet science

Keigo Enya; Shingo Kameda; Go Murakami; Masahiro Ikoma; Norio Narita; Takanori Kodama; Hiroyuki Sasai; Yoshitaka Makino; Naotaka Murata

doi:10.1117/12.2532484

9 September 2019 Development of high-efficiency reflective grating by holographic processing for UV exoplanet science

Keigo Enya, Shingo Kameda, Go Murakami, Masahiro Ikoma, Norio Narita, Takanori Kodama, Hiroyuki Sasai, Yoshitaka Makino, Naotaka Murata

Author Affiliations +

Proceedings Volume 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II; 111161B (2019) https://doi.org/10.1117/12.2532484
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

We present our development of high-efficiency reflective grating development by holographic processing. Its primary objective is to carry out exoplanet science studies in the ultraviolet (UV) wavelength region using space-borne telescopes. While the final development goal is aspheric grating, in this study, we manufactured planar grating samples with laminar and blazed grooves for our first step in order to establish processing conditions and to evaluate characteristics of each grating. Geometry of the manufactured gratings is 30×30×10 mm, and their groove density is 2400/mm. It was confirmed by Atomic Force Microscope (AFM) evaluation that laminar and blazed grooves were constructed on the surface of each grating. The measured absolute diffraction efficiency achieved by the brazed grating is 40.2% and 44.1% at wavelengths of 122 nm and 131 nm, respectively. These values are higher than values of the laminar grating by factor of ∼1.5.

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Keigo Enya, Shingo Kameda, Go Murakami, Masahiro Ikoma, Norio Narita, Takanori Kodama, Hiroyuki Sasai, Yoshitaka Makino, and Naotaka Murata "Development of high-efficiency reflective grating by holographic processing for UV exoplanet science", Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111161B (9 September 2019); https://doi.org/10.1117/12.2532484

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