Patent ID: 8178454

Claim:
An optical glass comprising a basic glass composition: that contains: SiO 2 2-10% B 2 O 3 5-45% La 2 O 3 30-60% RO (R = Zn, Sr, Ba) 0-15% Ln 2 O 3 (Ln = Y, Gd) 0-40%, and ZrO 2 + Nb 2 O 5 + Ta 2 O 5 0-30% by weight. wherein the optical glass further comprises a substance A that generates light of a wavelength λ2 when irradiated with light of a wavelength λ1 and a substance B that generates light of a wavelength λ3 when irradiated with light of the wavelength λ1, where λ1 <λ2 <λ3, wherein the substance A is one of As 2 O 3 , Sb 2 O 3 , V 2 O 5 , CuO, CeO 2 , platinum and antimony, and wherein the substance B is Fe, and a Fe content is 5-50 ppm with respect to 100% of the basic glass composition.