WINERED: optical design of warm infrared echelle spectrograph

Chikako Yasui; Yuji Ikeda; Naoto Kobayashi; Sohei Kondo; Atsushi Minami; Kentaro Motohara

doi:10.1117/12.672587

19 July 2006 WINERED: optical design of warm infrared echelle spectrograph

Chikako Yasui, Yuji Ikeda, Naoto Kobayashi, Sohei Kondo, Atsushi Minami, Kentaro Motohara

Proceedings Volume 6269, Ground-based and Airborne Instrumentation for Astronomy; 62694P (2006) https://doi.org/10.1117/12.672587
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

We are developing a short near-infrared (λ=0.9-1.35μm) high-resolution (R_max=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 R_max=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 R_max=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.

Citation Download Citation

Chikako Yasui, Yuji Ikeda, Naoto Kobayashi, Sohei Kondo, Atsushi Minami, and Kentaro Motohara "WINERED: optical design of warm infrared echelle spectrograph", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62694P (19 July 2006); https://doi.org/10.1117/12.672587

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