30 January 2003 Development of immersion grating for mid-infrared high dispersion spectrograph for the 8.2m Subaru Telescope
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Abstract
The mid-infrared high dispersion spectrograph (IRHS; tentative name) with a resolving power of 200,000 at 10 μm is a candidate of the second-generation instrument for the 8.2m Subaru Telescope. A germanium immersion grating will be employed as a dispersing element for this instrument. Germanium immersion gratings for the prototype IRHS were successfully fabricated by using a nano precision 3D profile grinding/turning machine and ELID grinding method on diamond machining. As a result, the fabricated gratings observed to have grooves with ideal saw-tooth shape, smooth surface and acceptable wave front error of a diffraction beam at 10μm. In the present paper, we characterized the performance of the developed immersion gratings.
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Noboru Ebizuka, Shin-ya Morita, Tomoyuki Shimizu, Yutaka Yamagata, Hitoshi Omori, Moriaki Wakaki, Hideomi Kobayashi, Hitoshi Tokoro, Yasuhiro Hirahara, "Development of immersion grating for mid-infrared high dispersion spectrograph for the 8.2m Subaru Telescope", Proc. SPIE 4842, Specialized Optical Developments in Astronomy, (30 January 2003); doi: 10.1117/12.457402; https://doi.org/10.1117/12.457402
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