Mid-infrared high-resolution spectrograph for SPICA

Kobayashi, Naoto; Ikeda, Yuji; Kawakita, Hideyo; Enya, Keigo; Kataza, Hirokazu; Matsuhara, Hideo; Hirahara, Yasuhiro; Tokoro, Hitoshi

doi:10.1117/12.799423

Cited by 9 publications

(4 citation statements)

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“…For example, in space astronomy, an immersion grating enables an infrared high-resolution spectrometer with R > 20; 000 to be mounted on a spacecraft [2][3][4] that could not be realized otherwise because of the heavy weight of conventional high-resolution spectrometers [5]. For ground-based astronomy, immersion gratings are useful as infrared high-resolution spectrometers for next-generation large telescopes such as the Thirty Meter Telescope (TMT, [6][7][8][9]) or the Giant Magellan Telescope (GMT, [10,11]).…”

Section: Introduction a Immersion Gratingmentioning

confidence: 99%

Machined immersion grating with theoretically predicted diffraction efficiency

Ikeda¹,

Kobayashi

Sarugaku

et al. 2015

Appl. Opt.

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An immersion grating composed of a transmissive material with a high refractive index (n>2) is a powerful device for high-resolution spectroscopy in the infrared region. Although the original idea is attributed to Fraunhofer about 200 years ago, an immersion grating with high diffraction efficiency has never been realized due to the difficulty in processing infrared crystals that are mostly brittle. While anisotropic etching is one successful method for fabricating a fine groove pattern on Si crystal, machining is necessary for realizing the ideal groove shape on any kind of infrared crystal. In this paper, we report the realization of the first, to the best of our knowledge, machined immersion grating made of single-crystal CdZnTe with a high diffraction efficiency that is almost identical to that theoretically predicted by rigorous coupled-wave analysis.

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Section: Introduction a Immersion Gratingmentioning

confidence: 99%

Machined immersion grating with theoretically predicted diffraction efficiency

Ikeda¹,

Kobayashi

Sarugaku

et al. 2015

Appl. Opt.

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“…In this paper, we describe the overview of the SPICA mission. Proposed focal-plane instruments 9,10,11,12,13 , cryogenics 14 , and related technology 15,16,17 are discussed in separate papers. …”

Section: Introductionmentioning

confidence: 99%

SPICA mission for mid- and far-infrared astronomy

Nakagawa

2008

Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter

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SPICA (Space Infrared Telescope for Cosmology and Astrophysics) is an astronomical mission optimized for mid-and far-infrared astronomy with a cryogenically cooled 3.5 m telescope. Its high spatial resolution and unprecedented sensitivity in the mid-and far-infrared will enable us to address a number of key problems in present-day astronomy, ranging from the star-formation history of the universe to the formation of planets. To reduce the mass of the whole mission, SPICA will be launched at ambient temperature and cooled down on orbit by mechanical coolers on board with an efficient radiative cooling system, a combination of which allows us to have a 3.5-m class cooled (5 K) telescope in space with moderate total weight (3t). SPICA is proposed as a Japanese-led mission together with extensive international collaboration. The assessment study on the European contribution to the SPICA project has started under the framework of the ESA Cosmic Vision 2015-2025. US and Korean participations are also being discussed extensively. The target launch year of SPICA is 2017.

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“…We already fabricated the large CdZnTe(CZT) immersion grating (Sukegawa et al (2012), Fig.1) [1][2] [3] and Germanium(Ge) immersion grating (Sukegawa et al (2015), Fig.2) [4]. Ge is the best material for a mid-infrared immersion grating because of Ge has very large reflective index (n=4.0).…”

Section: Introductionmentioning

confidence: 99%