GLASSES FOR THE CORRECTION OF CHROMATIC AND THERMAL OPTICAL ABERRATIONS FOR LENSES TRANSMITTING IN THE NEAR MID AND FAR-INFRARED SPRECTRUMS

摘要

The present invention relates to chalcogenide glass compositions for use in lens systems that provide a color element and a thermal optical element that balance heat effects and color effects to efficiently maintain color performance over a wide temperature range. The glass composition is based on sulfur in combination with germanium, arsenic and / or gallium and may further comprise, for example, halides of silver, zinc, or alkali metals. Alternatively, the glass composition is based on gallium, and preferably selenium in combination with germanium, for example containing chlorides and / or bromide of zinc, lead or alkali metals.