Glasses for Infrared Optics - Valentina F. Kokorina - Google Books

https://books.google.de/books?id=jOOSKQHEJdwC&pg=PA188#v=onepage

This book explores oxygen-free chalcogenide glasses, the only commercial transparent vitreous materials used for long-wave infrared radiation. The chalcogenides have been the subject of study around the world for many years, and continue to be an important…