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Proceedings Paper

WINERED: optical design of warm infrared echelle spectrograph
Author(s): Chikako Yasui; Yuji Ikeda; Naoto Kobayashi; Sohei Kondo; Atsushi Minami; Kentaro Motohara
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Paper Abstract

We are developing a short near-infrared (λ=0.9-1.35μm) high-resolution (Rmax=100,000) and high-sensitivity spectrograph "WINERED" by using several unique approaches. We adopt a classical cross-dispersed configuration for the optical system because it provides the best balance between the system throughput, alignment tolerances, and image quality (thereby producing high spectral resolution). Our design has four characteristics: (1) a ZnSe immersion echelle grating is used to realize a compact optical system even with Rmax=100,000; (2) a volume phase holographic (VPH) grating is used as across-disperser (in comparison with the classical reflective grating, the VPH grating decreases the camera optics and provides higher throughput); (3) a cooled refractive lens system is used for the camera optics; and (4) a reflective echelle grating can be replaced with the above-mentioned immersion grating to cover a wider wavelength range with Rmax=28,000. We have found a compact solution with high performance: all spots are well within 2×2 pixels throughout the entire detector array and the total throughput is more than 25% for all modes.

Paper Details

Date Published: 19 July 2006
PDF: 8 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62694P (19 July 2006); doi: 10.1117/12.672587
Show Author Affiliations
Chikako Yasui, Institute of Astronomy, Univ. of Tokyo (Japan)
Yuji Ikeda, Photocoding (Japan)
Naoto Kobayashi, Institute of Astronomy, Univ. of Tokyo (Japan)
Sohei Kondo, Institute of Astronomy, Univ. of Tokyo (Japan)
Atsushi Minami, Institute of Astronomy, Univ. of Tokyo (Japan)
Kentaro Motohara, Institute of Astronomy, Univ. of Tokyo (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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