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Proceedings Paper

A high-spectral resolution tandem Fabry-Perot spectrometer for 17-micrometer wavelength
Author(s): Takahiro Nagayama; Tetsuya Nagata; Takahiro Zenno; Chie Nagashima; Mikio Kurita; Shuji Sato; Masanori Kobayashi; Kentaro Haraguchi; Mitsunobu Kawada; Hirokazu Kataza; Yoshiko K. Okamoto
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Paper Abstract

We present our high spectral resolution tandem Fabry-Perot (FP) spectrometer for detecting the pure rotational transition line of molecular Hydrogen S (1) at 17.035 μm. It is designed to be attached to a new dedicated 1 m telescope planned to be put at a dry and high-altitude site. The spectrometer has two sequentially placed FP units (order 1000 and 99 with finesse >50) consisting of ZnSe etalons and one narrow band filter. We will be able to obtain high spectral resolution of R=50,000 at 17.035 μm. The ZnSe etalons of 110mm diameter with >94% reflectance are to be provided from Barr Associates. The interval and tilt of etalons are sensed and regulated by piezo actuators and newly-developed capacitance sensors, which resolve 100nm in vacuum and 30K environment. By changing the interval, we change the wavelength of transmission up to 17.2 μm, corresponding toν = 3000 km/s. We adopt an on-axis catadioptric system, in which the two FP units are placed. The focal plane detector is a Raytheon SB-774, 320×240 pixel array of Si:As, yielding 9.1 × 6.8 arcmin2 field of view with 1.7 arcsec pixel scale. To suppress the thermal background radiation and dark current of the Si:As detector, the system is cooled down to 6K at the detector and 35K for the whole optical system by two refrigerators. The development of spectrometer will be completed in 2007.

Paper Details

Date Published: 11 July 2006
PDF: 8 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626948 (11 July 2006); doi: 10.1117/12.671463
Show Author Affiliations
Takahiro Nagayama, Kyoto Univ. (Japan)
Tetsuya Nagata, Kyoto Univ. (Japan)
Takahiro Zenno, Kyoto Univ. (Japan)
Chie Nagashima, Nagoya Univ. (Japan)
Mikio Kurita, Nagoya Univ. (Japan)
Shuji Sato, Nagoya Univ. (Japan)
Masanori Kobayashi, Nagoya Univ. (Japan)
Kentaro Haraguchi, Nagoya Univ. (Japan)
Mitsunobu Kawada, Nagoya Univ. (Japan)
Hirokazu Kataza, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Yoshiko K. Okamoto, Institute of Astrophysics and Planetary Sciences, Ibaraki Univ. (Japan)

Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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