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21 August 1998 Dual-channel near-infrared/visible imaging systems
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Two imaging systems for 1 meter telescope with f/ratios of f/10 and f/16 capable of simultaneous operation in any one of the U, B, V or R passbands together with any one of the J, H or K passbands are described. The visible bands are separated from the IR bands by a dichroic beam-splitter. Identical fields are imaged on a 2048 by 2048 CCD with 15 micron pixels, and an InSb 1024 by 1024 array with 27 micron pixels at a scale of 0.3 arc-seconds per pixel. The system uses reflective optics prior to the dichroic followed by refractive optics to produce the final f/ratios. The astigmatism introduce into the IR transmitted beam by the dichroic substrate is corrected using a cylindrical mirror. An additional prismatic correction necessitated by the dispersion in the beam splitter is also addressed.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul Laurence Byard "Dual-channel near-infrared/visible imaging systems", Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998);


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