FIELD: physics, optics.
SUBSTANCE: interference filter comprises the first reflecting film and the second reflecting film arranged to face the first reflecting film with a gap in between. In the first version, the first and second reflecting films include an Ag-Sm-Cu alloy film. In the second version, the first and second reflecting films include an Ag-Bi-Nd alloy film. In the third version, the first and second reflecting films include one of the Ag-Sm-Cu and Ag-Bi-Nd alloy films. The first and second alloy films have a thickness of less than 80 nm.
EFFECT: high heat resistance and process resistance while maintaining reflecting power and high transmission capacity.
15 cl, 5 dwg
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