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Proceedings Paper

Alignment based on a no adjustment philosophy for the Immersion Grating Infrared Spectrometer (IGRINS)
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Paper Abstract

IGRINS, the Immersion GRating INfrared Spectrometer includes an immersion grating made of silicon and observes both H-band (1.49~1.80 μm) and K-band (1.96~2.46 μm), simultaneously. In order to align such an infrared optical system, the compensator in its optical components has been adjusted within tolerances at room temperature without vacuum environment. However, such a system will ultimately operate at low temperature and vacuum with no adjustment mechanism. Therefore a reasonable relationship between different environmental variations such as room and low temperature might provide useful knowledge to align the system properly. We are attempting to develop a new process to predict the Wave Front Error (WFE), and to produce correct mechanical control values when the optical system is perturbed by moving the lens at room temperature. The purpose is to provide adequate optical performance without making changes at operating temperature. In other words, WFE was measured at operating temperature without any modification but a compensator was altered correctly at room temperature to meet target performance. The ‘no adjustment’ philosophy was achieved by deterministic mechanical adjustment at room temperature from a simulation that we developed. In this study, an achromatic doublet lens was used to substitute for the H and K band camera of IGRINS. This novel process exhibits accuracy predictability of about 0.002 λ rms WFE and can be applied to a cooled infrared optical systems.

Paper Details

Date Published: 18 December 2012
PDF: 8 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85501B (18 December 2012); doi: 10.1117/12.981169
Show Author Affiliations
Jeong-Yeol Han, Korea Astronomy and Space Science Institute (Korea, Republic of)
In-Soo Yuk, Korea Astronomy and Space Science Institute (Korea, Republic of)
SELab Inc. (Korea, Republic of)
Kyeongyeon Ko, Korea Astronomy and Space Science Institute (Korea, Republic of)
Heeyoung Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jakyoung Nah, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jae Sok Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sungho Lee, SELab Inc. (Korea, Republic of)
Kang-Min Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Daniel T. Jaffe, The Univ. of Texas at Austin (United States)
Soojong Pak, Kyung Hee Univ. (Korea, Republic of)
Michael Gully-Santiago, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 8550:
Optical Systems Design 2012
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood; Marta C. de la Fuente; Jean-Luc M. Tissot; Jeffrey M. Raynor; Daniel G. Smith; Frank Wyrowski; Andreas Erdmann; Tina E. Kidger; Stuart David; Pablo Benítez, Editor(s)

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