"Optical design and performance of the 12-26micron channel (MIR-L) of the infrared camera on board ASTRO-F"

Fujishiro, et al.

Abstract:
MIR-L is a 12-26μm channel of Infrared Camera(IRC) onboard ASTRO-F. The camera employs a refractive optics which consists of 5 lenses (CsI - CsI - KRS-5 - CsI - KRS-5) and a large format Si:As IBC array detector (256×256 pixels). The design concept is to realize a wide field of view with a compact size. It has 2 observing modes: a wide field imaging with a field of view of 10.7×10.2 arcmin^2 or a pixel resolution of 2.5×2.4 arcsec^2/pixel in 3 bands (12.5-18μm, 14-26μm, 22-26μm),and low resolution spectroscopy with a spectral resolution R ～ 40 in 2 bands (11-19μm,18-26μm). 　　It also has a small slit to adapt for spectroscopic observations of extended sources. We describe the current design of the optics and the mounting architecture of MIR-L and　evaluation of the optical performance at cryogenic　temperatures.

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