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1. (WO2013159009) GLASSES FOR CORRECTION OF CHROMATIC AND THERMAL OPTICAL ABERRATIONS FOR LENSES TRANSMITTING IN THE NEAR, MID, AND FAR-INFRARED SPRECTRUMS

Pub. No.:    WO/2013/159009    International Application No.:    PCT/US2013/037395
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Sat Apr 20 01:59:59 CEST 2013
IPC: C03C 3/32
G02B 3/00
Applicants: SCHOTT CORPORATION
Inventors: CARLIE, Nathan Aaron
Title: GLASSES FOR CORRECTION OF CHROMATIC AND THERMAL OPTICAL ABERRATIONS FOR LENSES TRANSMITTING IN THE NEAR, MID, AND FAR-INFRARED SPRECTRUMS
Abstract:
The invention relates to chalcogenide glass compositions for use in a lens system to balance thermal effects and chromatic effects and thereby provide an achromatic and a thermal optical element that efficiently maintains achromatic performance across a broad temperature range. The glass composition is based on sulfur compounded with germanium, arsenic and/or gallium, and may further comprise halides of, for example, silver, zinc, or alkali metals. Alternatively, the glass composition is based on selenium compounded with gallium, and preferably germanium, and contains chlorides and/or bromides of, for example, zinc, lead or alkali metals.