High resolution spectrograph unit (HRU) for the SUBARU/IRCS

Hiroshi Terada; Ikeda Yuji; Naoto Kobayashi; Chikako Yasui; Tae-Soo Pyo; Tomonori Usuda; Masahiko Hayashi; Hideyo Kawakita

doi:10.1117/12.788561

9 July 2008 High resolution spectrograph unit (HRU) for the SUBARU/IRCS

Hiroshi Terada, Ikeda Yuji, Naoto Kobayashi, Chikako Yasui, Tae-Soo Pyo, Tomonori Usuda, Masahiko Hayashi, Hideyo Kawakita

Author Affiliations +

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 701434 (2008) https://doi.org/10.1117/12.788561
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

We present an upgrade plan of the infrared camera and spectrograph for the Subaru Telescope (IRCS^1-4) to introduce the high resolution spectroscopic mode (a resolving power; R=λ/Δλ > 70,000) in the infrared bands (1.4-5.5 μm). To realize the compact and stable cooled instrument, we are developing the immersion grating⁵ with Si whose refractive index is ~ 3.4. The optics design is significantly compact (600mm × 250mm × 250mm) using the Si immersion grating, and it can be easily located beside or inside the IRCS main dewar. The IRCS has been operating for 8 years with an extremely stable condition, and it is combined with the next generation adaptive optics system (AO188⁶) and the laser guide star system (LGS⁷) of the Subaru Telescope. The quick integration of the new high resolution spectrograph unit (HRU) can be expected by using the existing stable instrument. The total performance with the designed optics is so good that the optical design could meet the required specifications. The image quality shows a strehl ratio of > 0.88 for the entire bands, and 24 scannings of the gratings can cover the 1.4-5.5 μm. We plan to fabricate the Si immersion grating for the actual astronomical use in 2009, and the HRU will be built around 2011. It will be the first high sensitive infrared spectrograph with high spectral resolution capability in the northern hemisphere and with the laser guide star AO system.

Citation Download Citation

Hiroshi Terada, Ikeda Yuji, Naoto Kobayashi, Chikako Yasui, Tae-Soo Pyo, Tomonori Usuda, Masahiko Hayashi, and Hideyo Kawakita "High resolution spectrograph unit (HRU) for the SUBARU/IRCS", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701434 (9 July 2008); https://doi.org/10.1117/12.788561

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available