9 August 2016 VINROUGE: a very compact 2-5μm high-resolution spectrograph with germanium immersion grating
Author Affiliations +
The infrared high-resolution and highly-sensitive spectroscopy can provide new and deep insights in many fields of astronomy. The 2.0-5.5 μm region is a very unique and important wavelength region for astrochemistry and astrobiology, because the vibrational transitions of C-H, N-H, O-H, C-O, and C-N bonds in many molecules, which are of astrophysical interest, concentrate in this wavelength range. To advance the study in this wavelength range, we are developing a new near-infrared spectrograph: VINROUGE (= Very-compact INfrared high-ResOlUtion Ge-immersion Echelle spectrograph). The instrumental concepts of VINROUGE are “high-resolution”, “highly-sensitive”, and “very-compact instrumentation”. With (i) Germanium immersion grating, (ii) white pupil spectrograph design, (iii) reflective optics using the integrated off-axis mirrors and the optical bench by ceramic (cordierite CO-220), and (iv) highly-sensitive array (HAWAII-2RG 5.3μm cutoff array), we could obtain a solution of optical design with a spectral resolution of 80,000, total throughput of > 0.28, and a compact volume that is smaller than 600 mm×600 mm×600 mm even for 10-m class telescope. We have already completed the development of Germanium immersion grating. In this year, we plan to fabricate a set of integrated off-axis ceramic mirrors together with the ceramic optical bench to demonstrate that the reflective optics was an athermal performance. The first light of VINROUGE is expected in 2019.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Takayuki Arasaki, Takayuki Arasaki, Naoto Kobayashi, Naoto Kobayashi, Yuji Ikeda, Yuji Ikeda, Shohei Kondo, Shohei Kondo, Yuki Sarugaku, Yuki Sarugaku, Sayumi Kaji, Sayumi Kaji, Hideyo Kawakita, Hideyo Kawakita, "VINROUGE: a very compact 2-5μm high-resolution spectrograph with germanium immersion grating", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990875 (9 August 2016); doi: 10.1117/12.2233739; https://doi.org/10.1117/12.2233739

Back to Top