A high-spectral resolution tandem Fabry-Perot spectrometer for 17-micrometer wavelength

Takahiro Nagayama; Tetsuya Nagata; Takahiro Zenno; Chie Nagashima; Mikio Kurita; Shuji Sato; Masanori Kobayashi; Kentaro Haraguchi; Mitsunobu Kawada; Hirokazu Kataza; Yoshiko K. Okamoto

doi:10.1117/12.671463

11 July 2006 A high-spectral resolution tandem Fabry-Perot spectrometer for 17-micrometer wavelength

Takahiro Nagayama, Tetsuya Nagata, Takahiro Zenno, Chie Nagashima, Mikio Kurita, Shuji Sato, Masanori Kobayashi, Kentaro Haraguchi, Mitsunobu Kawada, Hirokazu Kataza, Yoshiko K. Okamoto

Author Affiliations +

Proceedings Volume 6269, Ground-based and Airborne Instrumentation for Astronomy; 626948 (2006) https://doi.org/10.1117/12.671463
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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.

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Takahiro Nagayama, Tetsuya Nagata, Takahiro Zenno, Chie Nagashima, Mikio Kurita, Shuji Sato, Masanori Kobayashi, Kentaro Haraguchi, Mitsunobu Kawada, Hirokazu Kataza, and Yoshiko K. Okamoto "A high-spectral resolution tandem Fabry-Perot spectrometer for 17-micrometer wavelength", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626948 (11 July 2006); https://doi.org/10.1117/12.671463

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KEYWORDS

Fabry–Perot interferometers

Sensors

Spectroscopy

Telescopes

Actuators

Spectral resolution

Staring arrays

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