Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....3..145w&link_type=abstract
Experimental Astronomy, vol. 3, no. 1-4, p. 145-146
Astronomy and Astrophysics
Astronomy
Arrays, Infrared Detectors, Infrared Telescopes, Lens Design, Near Infrared Radiation, Refracting Telescopes, Alkaline Earth Compounds, Halides, Infrared Astronomy, Metal Oxides
Scientific paper
As modern infrared arrays evolve towards larger formats and smaller pixel sizes, their use in instruments requires optics of increasingly higher performance. Refractive systems are attractive for many applications because they can accommodate wide fields of view or fast focal ratios while permitting a compact, unobscured layout. We examine design considerations for lenses which can address the entire near-infrared spectral region of 0.8 to 2.5 micrometers. Achromatization over this broad range is a particular challenge. We discuss a systematic study of candidate materials and combinations of materials having useful chromatic properties, with particular emphasis on alkaline earth halides and metallic oxides. We present an example of a practical design being incorporated into an instrument currently under construction.
Rudy Richard J.
Warren David W.
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