Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4842..402x&link_type=abstract
Specialized Optical Developments in Astronomy. Edited by Atad-Ettedgui, Eli; D'Odorico, Sandro. Proceedings of the SPIE, Volume
Astronomy and Astrophysics
Astronomy
Scientific paper
For dioptic instruments working in the near-infrared (NIR), the choice of materials for lenses is mostly limited to special glasses or crystals. Most commonly used are CaF2, BaF2, infrared fused silica, ZnS and ZnSe. Those materials can in general not provide good chromatic correction for fast systems. Moreover, the high index materials, as well as infrared glass like Schott IRG, are quite limited with regard to availability in larger sizes and thicknesses and/or optical quality. An investigation was made for optical glasses from the Schott and Ohara catalogues with high transmission up to a wavelength of 2.4 μm. For the most promising materials, the transmission from λ0.35μm to λ3.0μm, was measured in the lab with high spectral resolution. A systematic analysis of combinations of those optical glasses with the infrared materials was performed and the combinations with extremely good chromatic correction in the NIR are presented. There were several combinations found which are well corrected even from λ0.55μm to λ2.5μm, as needed for some designs of adaptive optics systems.
Seifert Walter
Xu Wenli
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