Optical component and optical module

摘要

An optical component emits or transmits laser light of a wavelength of 460 nm or less. A first coating (A) formed from a dielectric film like SiO2 is applied upon at least a part of the surface thereof as an AR coating, and a second coating (B) formed from a dielectric film containing a noble metal or platinum group element is applied upon the first coating (A) to prevent contamination of the surface of the optical component. A laser diode (10) in a housing (70) with a window (20) may have said contamination preventing coating (B) on the light emitting surface and the outside of the window (20).