SCHOTT has introduced IRG 27, a classic chalcogenide glass (As2S3), possessing transparency from approximately 0.65 μm to well into the long-wavelength IR (> 10 μm). Additionally, this glass exhibits an extremely small thermo-optic (dn/dT) value for most of its transparency range, a critical attribute in certain applications. Relatively low density and a good thermal expansion match to aluminum are further useful characteristics of IRG 27.
Mark J. Davis, William James, Gernot Weber, and Ralf Jedamzik, "IRG 27: a "new" glass type for multi-band IR optics," Proc. SPIE 10100, Optical Components and Materials XIV, 1010016 (Presented at SPIE OPTO: February 01, 2017; Published: 16 February 2017); https://doi.org/10.1117/12.2257225.
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