Immersion grating mount design for IGRINS and GMTNIRS

Bongkon Moon; Weisong Wang; Chan Park; In-soo Yuk; Moo-Young Chun; Daniel T. Jaffe

doi:10.1117/12.925702

13 September 2012 Immersion grating mount design for IGRINS and GMTNIRS

Bongkon Moon, Weisong Wang, Chan Park, In-soo Yuk, Moo-Young Chun, Daniel T. Jaffe

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 845048 (2012) https://doi.org/10.1117/12.925702
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The IGRINS (Immersion GRating INfrared Spectrometer) is a high resolution wide-band infrared spectrograph developed by the Korea Astronomy and Space Science Institute (KASI) and the University of Texas at Austin (UT). Immersion grating is a key component of IGRINS, which disperses the input ray by using a silicon material with a lithography technology. Optomechanical mount for the immersion grating is important to keep the high spectral resolution and the optical alignment in a cold temperature of 130±0.06K. The optical performance of immersion grating can maintain within the de-center tolerance of ±0.05mm and the tip-tilt tolerance of ±1.5arcmin. The mount mechanism utilizes the flexure and the semikinematic support design to satisfy the requirement and the operation condition. When the IGRINS system is cooled down to a cold temperature, three flexures compensate for the thermal contraction stress due to the different material between the immersion grating and the mounting part (aluminum 6061). They also support the immersion grating by an appropriate preload. Thermal stability is controlled by a copper strap with proper dimensions and a heater. Typically, structural and thermal analysis was performed to confirm the mount mechanism. This mechanism will be also applied to the GMTNIRS (Giant Magellan Telescope Near InfraRed Spectrograph) instrument, which is a first-generation candidate of the GMT telescope.

Citation Download Citation

Bongkon Moon, Weisong Wang, Chan Park, In-soo Yuk, Moo-Young Chun, and Daniel T. Jaffe "Immersion grating mount design for IGRINS and GMTNIRS", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845048 (13 September 2012); https://doi.org/10.1117/12.925702

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