The precise measurement of the attenuation coefficients of various IR optical materials applicable to immersion grating

Sayumi Kaji; Yuki Sarugaku; Yuji Ikeda; Naoto Kobayashi; Kenshi Nakanishi; Sohei Kondo; Chikako Yasui; Hideyo Kawakita

doi:10.1117/12.2055644

8 July 2014 The precise measurement of the attenuation coefficients of various IR optical materials applicable to immersion grating

Sayumi Kaji, Yuki Sarugaku, Yuji Ikeda, Naoto Kobayashi, Kenshi Nakanishi, Sohei Kondo, Chikako Yasui, Hideyo Kawakita

Author Affiliations +

Proceedings Volume 9147, Ground-based and Airborne Instrumentation for Astronomy V; 914738 (2014) https://doi.org/10.1117/12.2055644
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Immersion grating is a next-generation diffraction grating which has the immersed the diffraction surface in an optical material with high refractive index of n > 2, and can provide higher spectral resolution than a classical reflective grating. Our group is developing various immersion gratings from the near- to mid-infrared region (Ikeda et al.^{1, 2, 3, 4}, Sarugaku et al.⁵, and Sukegawa et al.6). The internal attenuation α_att of the candidate materials is especially very important to achieve the high efficiency immersion gratings used for astronomical applications. Nevertheless, because there are few available data as α_att < 0.01cm^-1 in the infrared region, except for measurements of CVD-ZnSe, CVD-ZnS, and single-crystal Si in the short near-infrared region reported by Ikeda et al.7, we cannot select suitable materials as an immersion grating in an aimed wavelength range. Therefore, we measure the attenuation coefficients of CdTe, CdZnTe, Ge, Si, ZnSe, and ZnS that could be applicable to immersion gratings. We used an originally developed optical unit attached to a commercial FTIR which covers the wide wavelength range from 1.3μm to 28μm. This measurement system achieves the high accuracy of (triangle)α_att ~ 0.01cm^-1. As a result, high-resistivity single-crystal CdZnTe, single-crystal Ge, single-crystal Si, CVD-ZnSe, and CVD-ZnS show α_att < 0.01cm-1 at the wavelength range of 5.5 - 19.0μm, 2.0 - 10.5μm, 1.3 - 5.4μm, 1.7 - 13.2μm, and 1.9 - 9.2μm, respectively. This indicates that these materials are good candidates for high efficiency immersion grating covering those wavelength ranges. We plan to make similar measurement under the cryogenic condition as T ≤ 10K for the infrared, especially mid-infrared applications.

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Sayumi Kaji, Yuki Sarugaku, Yuji Ikeda, Naoto Kobayashi, Kenshi Nakanishi, Sohei Kondo, Chikako Yasui, and Hideyo Kawakita "The precise measurement of the attenuation coefficients of various IR optical materials applicable to immersion grating", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914738 (8 July 2014); https://doi.org/10.1117/12.2055644

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