| 摘要 |
PROBLEM TO BE SOLVED: To provide a brewster window improved in laser durability. SOLUTION: The brewster window is disposed inside a laser oscillator such that laser light is oscillated by linear polarization, and includes: a substrate 1 which is constituted of an alkaline earth metal fluoride monocrystal and of which the surface is flattened; and fluoride films 2a, 2a' of a polycrystal or amorphous structure formed on at least one surface of the substrate. The fluoride film 2a, 2a' is constituted of any of gadolinium fluoride, magnesium fluoride, lanthanum fluoride, aluminum fluoride and cryolite. The fluoride film may also be a multilayer film like fluoride films 2b, 2b'. COPYRIGHT: (C)2009,JPO&INPIT |
