Developing the wide-spectral coverage, very high-efficiency grisms for MOIRCS on Subaru Telescope

Ichi Tanaka; Noboru Ebizuka; Kentaro Motohara; Tadayuki Kodama; Takashi Hattori; Koji Omata; Hidenori Takahashi; Masahiro Konishi; Yoko Tanaka

doi:10.1117/12.2561176

13 December 2020 Developing the wide-spectral coverage, very high-efficiency grisms for MOIRCS on Subaru Telescope

Ichi Tanaka, Noboru Ebizuka, Kentaro Motohara, Tadayuki Kodama, Takashi Hattori, Koji Omata, Hidenori Takahashi, Masahiro Konishi, Yoko Tanaka

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114515A (2020) https://doi.org/10.1117/12.2561176
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The fabrication of the new medium-resolution grisms for MOIRCS onboard Subaru 8.2-m Telescope is presented. Our new grisms feature the state-of-the-art gratings that have very high efficiency and wide-spectral coverage manufactured by LightSmyth for the pulse-compression technology. The grating has the peak efficiency of over 96% and can cover the whole H-band wavelength range with over 90%. This is the first-time astronomical application case for the LightSmyth grating. We manufactured the custom-made H-band grism as well as the catalog product J-band grism with a bit less ideal performance. The cooling test of the grisms was done successfully, confirming the stability of the wave-front error over the cooling cycle. On-sky performance test of the new grisms were achieved in July 2020, and we have confirmed the high sensitivity as well as the amazing flatness of the throughput of these grisms. Though we cofirmed the existence of some faint ghosts of the 0-th order light as anticipated, the effect of them are confirmed to be negligible. We started offering the use of the grisms for Subaru community from August 2020.

Conference Presentation

Citation Download Citation

Ichi Tanaka, Noboru Ebizuka, Kentaro Motohara, Tadayuki Kodama, Takashi Hattori, Koji Omata, Hidenori Takahashi, Masahiro Konishi, and Yoko Tanaka "Developing the wide-spectral coverage, very high-efficiency grisms for MOIRCS on Subaru Telescope", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114515A (13 December 2020); https://doi.org/10.1117/12.2561176

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