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http://dx.doi.org/10.5140/JASS.2012.29.2.233

IGRINS Mirror Mount Design for Three Off-Axis Collimators and One Slit-Viewer Fold Mirror  

Rukdee, Surangkhana (University of Science and Technology)
Park, Chan (Korea Astronomy and Space Science Institute)
Kim, Kang-Min (Korea Astronomy and Space Science Institute)
Lee, Sung-Ho (Korea Astronomy and Space Science Institute)
Chun, Moo-Young (Korea Astronomy and Space Science Institute)
Yuk, In-Soo (Korea Astronomy and Space Science Institute)
Oh, Hee-Young (University of Science and Technology)
Jung, Hwa-Kyoung (Korea Astronomy and Space Science Institute)
Lee, Chung-Uk (Korea Astronomy and Space Science Institute)
Lee, Han-Shin (McDonald Observatory, University of Texas at Austin)
Rafal, Marc D. (McDonald Observatory, University of Texas at Austin)
Barnes, Stuart (McDonald Observatory, University of Texas at Austin)
Jaffe, Daniel T. (Department of Astronomy, University of Texas at Austin)
Publication Information
Journal of Astronomy and Space Sciences / v.29, no.2, 2012 , pp. 233-244 More about this Journal
Abstract
The Korea Astronomy and Space Science Institute and the Department of Astronomy at the University of Texas at Austin are developing a near infrared wide-band high resolution spectrograph, immersion grating infrared spectrometer (IGRINS). The compact white-pupil design of the instrument optics uses seven cryogenic mirrors, including three aspherical off-axis collimators and four flat fold mirrors. In this study, we introduce the optomechanical mount designs of three off-axis collimating mirrors and one flat slit-viewer fold mirror. Two of the off-axis collimators are serving as H and K-band pupil transfer mirrors, and are designed as system alignment compensators in combination with the H2RG focal plane array detectors in each channel. For this reason, the mount designs include tip-tilt and parallel translation adjustment mechanisms to properly perform the precision alignment function. This means that the off-axis mirrors' optomechanical mount designs are among the most sensitive tasks in all IGRINS system hardware. The other flat fold mirror is designed within its very limitedly allowed work space. This slit-viewer fold mirror is mounted with its own version of the six-point kinematic optics mount. The design work consists of a computer-aided 3D modeling and finite element analysis (FEA) technique to optimize the structural stability and the thermal behavior of the mount models. From the structural and thermal FEA studies, we conclude that the four IGRINS mirror mounts are well designed to meet all optical stability tolerances and system thermal requirements.
Keywords
immersion grating infrared spectrometer; cryogenic optomechanics; off-axis mirror; collimator; finite element analysis; structural analysis; thermal analysis;
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  • Reference
1 Barnes S, IGRINS optical design report (KASI-UT IGRINS Project Team, 2009), 13.
2 Wilson JC, Hearty F, Skrutskie MF, Majewski S, Schiavon R, et al., The Apache Point Observatory Galactic Evolution Experiment (APOGEE) high-resolution near-infrared multi-object fiber spectrograph, SPIE, 7735, 77351C (2010). http://dx.doi.org/10.1117/12.856708
3 Yoder PR, Mounting optics in optical instruments, 2nd ed. (SPIE, Washington, DC, 2008).
4 Yuk IS, Jaffe DT, Barnes S, Chun MY, Park C, et al., Preliminary design of IGRINS (Immersion GRating INfrared Spectrograph), SPIE, 7735, 77351M (2010). http://dx.doi.org/10.1117/12.856864
5 Yuk IS, Han JY, Nah JK, Ko KY, Oh HY, IGRINS alignment, v1.6 (KASI-UT IGRINS Project Team, 2012).
6 Zimmerman J, Strain-free mounting techniques for metal mirrors, OptEn, 20, 187-189 (1981).
7 Stahlberger WE, Personal communication in the consultant visit to Institute for Astronomy, University of Hawaii (2010).
8 Thornton RJ, The AEOS spectrograph: opto-mechanical design and scientific capability, PhD Dissertation, University of Hawaii (2002).
9 Thornton RJ, Kuhn JR, Hodapp K-W, Stockton AN, Luppino GA, et al., Design and commissioning of a dual visible/near-IR echelle spectrograph for the AEOS telescope, SPIE, 4841, 1115-1126 (2003). http://dx.doi.org/10.1117/12.462598
10 Tokunaga AT, Bond T, Jaffe DT, Mumma MJ, Rayner JT, et al., Silicon immersion grating spectrograph design for the NASA infrared telescope facility, SPIE, 7014, 70146A (2008). http://dx.doi.org/10.1117/12.788253
11 Wilson JC, Personal communication in the SPIE conference 2010 at San Diego (2010).
12 Mok S, Lee S, Yuk I-S, Park Y, Jin H, et al., Fabrication and alignment of parts of the KASINICS Offner System, PKAS, 21, 43-49 (2006).
13 Moon BK, Jin H, Yuk I-S, Lee S, Nam UW, et al., KASINICS: near infrared camera system for the BOAO 1.8m telescope, PASJ, 60, 849-856 (2006).
14 Moore JH, Davis CC, Coplan MA, Greer SC, Building scientific apparatus, 4th ed. (Cambridge University Press, New York, 2009).
15 Smith WJ, Modern optical engineering: the design of optical systems, 4th ed. (McGraw Hill, New York, 2008).
16 Oh JS, Park C, Chun MY, Jeong UJ, Ko KY, Cryogenic performance of IGRINS Test Dewar, KASI Technical Note 11-013-096 (2011).
17 Rayner JT, Toomey DW, Onaka PM, Denault AJ, Stahlberger WE, et al., SpeX: a medium-resolution 0.8-5.5 micron spectrograph and imager for the NASA infrared telescope facility, PASP, 115, 362-382 (2003). http://dx.doi.org/10.1086/367745   DOI
18 Schroeder DJ, Astronomical optics, 2nd ed. (Academic Press, San Diego, 2000), 385-394.
19 Lee SH, IGRINS functional and performance requirements document, 2nd ed. (KASI-UT IGRINS Project Team, 2010).
20 Marsh JP, Mar DJ, Jaffe DT, Production and evaluation of silicon immersion gratings for infrared astronomy, ApOpt, 46, 3400-3416 (2007). http://dx.doi.org/10.1364/AO.46.003400
21 Massey P, Hanson MM, Astronomical spectroscopy (2011). http://arxiv.org/abs/1010.5270v2
22 McLean IS, Steidel CC, Matthews K, Epps H, Adkins SM, MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory, SPIE, 7014, 70142Z (2008). http://dx.doi.org/10.1117/12.788142
23 Baumeister H, Bizenberger P, Bailer-Jones CAL, Kovacs Z, Röser H-J, et al., Cryogenic engineering for OMEGA2000: design and performance, SPIE, 4841, 343-354 (2003). http://dx.doi.org/10.1117/12.461003
24 Hearnshaw J, Astronomical spectrographs and their history (Cambridge University Press, Cambridge, 2009).
25 Kingslake R, Johnson RB, Lens design fundamentals, 2nd ed. (Academic Press, Boston, 2010), 6-8.
26 Jaffe DT, IGRINS critical design review report (KASI-UT IGRINS Project Team, 2011).
27 Jaffe DT, Keller LD, Ershov OA, Micromachined silicon diffraction gratings for infrared spectroscopy, SPIE, 3354, 201-212 (1998).
28 Kanneganti S, Park C, Skrutskie MF, Wilson JC, Nelson MJ, et al., FanCam-a near-infrared camera for the Fan Mountain Observatory, PASP, 121, 885-896 (2009). http://dx.doi.org/10.1086/605451
29 Avallone EA, Baumeister T III, Sadegh AM, Marks' standard handbook for mechanical engineers, 11th ed. (McGraw-Hill, New York, 2007).