Transmission Gratings and Immersion Gratings for Instruments of Subaru Telescope and TMT

N. Ebizuka; T. Okamoto; M. Takeda; T. Hosobata; Y. Yamagata; M. Sasaki; M. Uomoto; T. Shimatsu; S. Sato; N. Hashimoto; I. Tanaka; T. Hattori; S. Ozaki; W. Aoki

doi:10.1299/jsmelem.2017.9.165

2017.9

Session ID : 165

DOI https://doi.org/10.1299/jsmelem.2017.9.165

Conference information

Host: The Japan Society of Mechanical Engineers

Name : [in Japanese]

Date : November 13, 2017 - November 17, 2017

Transmission Gratings and Immersion Gratings for Instruments of Subaru Telescope and TMT

N. Ebizuka, T. Okamoto, M. Takeda, T. Hosobata, Y. Yamagata, M. Sasaki, M. Uomoto, T. Shimatsu, S. Sato, N. Hashimoto, I. Tanaka, T. Hattori, S. Ozaki, W. Aoki

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Keywords: Volume grating, Echelle spectrograph, RCWA, Shaper cutting, MEMS technology

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Abstract

We would introduce current status of developments of a reflector facet transmission (RFT) grating for the WFOS (Wide-Field Optical Spectrograph) of the TMT (Thirty Meter Telescope), hybrid grism (direct vision grating) for the MOIRCS (Multi-Objects Infrared Camera and Spectrograph) of the 8.2m Subaru Telescope, and volume binary (VB) grating for an echelle grism of the MOIRCS. We also introduce test fabrications of a birefringence VPH grating with liquid crystals of an UV curable and normal liquid crystal or a resin of visible light curable, and test fabrications of a quasi-Bragg (QB) immersion grating which is combined a QB grating with tilted mirror array, Littrow prism and surface mirror.

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