Patent ID: 6620347
Filing Date: 2003-09-16
Classification: C01B,C30B,G02B,Y10T

Abstract:
A crystalline filter, comprising:a crystal including a host material and first and second dopant compounds, said crystal being transparent within at least a desired spectral region; said host material chosen from the group consisting of MgF2, CaF2, SrF2, BaF2, and CdF2; said first dopant compound including a lanthanide fluoride or actinide fluoride wherein the lanthanide or actinide is chosen from the group of elements consisting of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and U; said second dopant compound including the same lanthanide or actinide selected to form the first dopant compound, said second dopant compound being selected from the group consisting of a nitride compound, an oxide compound, a boride compound, a carbide compound, and a hydroxide compound; and wherein said first and second dopant compounds provide optical absorption bands such that the crystalline filter has a passband within the desired spectral region.