Patent ID: 7116888
Filing Date: 2006-10-03
Classification: C03C,G02B

Abstract:
1. A precision optical element comprising a chalcogenide glass body with either fine or hyperfine microstructures, said body being comprised of a chalcogenide glass of general formula YZ; where Y is Ge, As, Sb or a mixture of two or more of the same; and Z is S, Se, Te, or a mixture of two or more of the same; wherein Y is in the range of 15–70% and Z is in the range of 30–85%; and provided that when Ge is mixed with one or both of As and Sb, the amount of Ge is in the range of 0<Ge<25%; and wherein said chalcogenide glass has a viscosity of 10,000 poise or less at a temperatuer of 500° C. or less, and said glasses are resistant to crystallization at shear rates in the range of 1000–10,000 sec