27 September 2013 The development and analysis of cryogenic optical systems for the rapid infrared imager/spectrometer
Author Affiliations +
The Observational Cosmology Laboratory at NASA’s Goddard Space Flight Center (GSFC), in collaboration with the University of Maryland, is building the Rapid Infrared Imager/Spectrometer (RIMAS) for the new 4.3 meter Discovery Channel Telescope (DCT). The instrument is designed to observe gamma-ray burst (GRB) afterglows following their initial detection by the Swift satellite. RIMAS will operate in the near infrared (0.9 – 2.4 microns) with all of its optics cooled to ~60 K. The primary optical design includes a collimator lens assembly, a dichroic dividing the wavelength coverage into the “YJ band” and “HK band” optical arms, and camera lens assemblies for each arm. Additionally, filters and dispersive elements are attached to wheels positioned prior to each arm’s camera, allowing the instrument to quickly change from its imaging modes to spectroscopic modes. Optics have also been designed to image the sky surrounding spectroscopic slits to help observers pass light from target sources through these slits. Because the optical systems are entirely cryogenic, it was necessary to account for changing refractive indices and model the effects of thermal contraction. One result of this work is a lens mount design that keeps lenses centered on the optical axis as the system is cooled. Efforts to design, tolerance and assemble these cryogenic optical systems are presented.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John I. Capone, David A. Content, Ori D. Fox, Neil A. Gehrels, Alexander S. Kutyrev, Gennadiy N. Lotkin, Samuel H. Moseley, Frederick D. Robinson, Vicki L. Toy, Sylvain Veilleux, Stuart N. Vogel, "The development and analysis of cryogenic optical systems for the rapid infrared imager/spectrometer", Proc. SPIE 8863, Cryogenic Optical Systems and Instruments 2013, 88630D (27 September 2013); doi: 10.1117/12.2023123; https://doi.org/10.1117/12.2023123


Cryogenic Refractor Design Techniques
Proceedings of SPIE (February 01 1985)
Imaging Fourier transform spectrometer for NGST
Proceedings of SPIE (July 28 2000)
Ohio State Infrared Imager/Spectrometer (OSIRIS)
Proceedings of SPIE (October 20 1993)
ABEL a near IR grism spectrometer and camera for...
Proceedings of SPIE (August 21 1998)

Back to Top