Design and status of an optical and near-infrared spectrometer for the IRSF 1.4m Telescope

Takahiro Nagayama; Mikio Kurita; Masaru Kino; Daisuke Mori; Takuma Kokusho

doi:10.1117/12.926029

24 September 2012 Design and status of an optical and near-infrared spectrometer for the IRSF 1.4m Telescope

Takahiro Nagayama, Mikio Kurita, Masaru Kino, Daisuke Mori, Takuma Kokusho

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 844671 (2012) https://doi.org/10.1117/12.926029
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

We present our new optical and near-infrared (NIR) spectrometer for the IRSF 1.4m telescope. The concept of it is an effective use of photons, and so we have designed it to obtain a spectrum of the 0.4-2.5μm range simultaneously and have a small number of optical surfaces in order to reduce reflection loss. Light collected by the telescope is separated into optical (0.45-0.90μm) and NIR (1.0-2.5μm) wavelengths by a dichroic entrance window, and two spectrometers are prepared, one for the optical wavelengths and another for the NIR. We use a sapphire prism in the NIR spectrometer, and a diffraction grating in the optical spectrometer. The optical design is very simple and the number of optical surfaces is 9 for optical and 10 for NIR (not including the telescope mirrors). A 1024×250 pixels CCD (optical) and a 1024×1024 HgCdTe detector array (NIR) are used. The spectral resolution will be 470@0.70μm and 380@1.8μm with a 1” slit width. A NIR slit viewer with a 3’.5 × 3’.5 field of view is also mounted. The development of the spectrometer will be complete by March 2013.

Citation Download Citation

Takahiro Nagayama, Mikio Kurita, Masaru Kino, Daisuke Mori, and Takuma Kokusho "Design and status of an optical and near-infrared spectrometer for the IRSF 1.4m Telescope", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844671 (24 September 2012); https://doi.org/10.1117/12.926029

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