INFRARED OPTICAL FILM, CIRCULARLY POLARIZING MIRROR, LASER PROCESSOR HAVING CIRCULARLY POLARIZING MIRROR, AND MANUFACTURING METHOD FOR INFRARED OPTICAL FILM

摘要

PROBLEM TO BE SOLVED: To provide an infrared optical film with enhanced heat resistance without sacrificing optical performance.;SOLUTION: A multilayered infrared optical film comprises high refractive index layers made of Ge and low refractive index layers made of a material having a refractive index smaller than that of Ge alternately formed to cover an optical reflection film formed on a substrate. Each low refractive index layer includes a layer made of either ZnS or ZnSe, and each high refractive index layer is made of Ge. At least one of the low refractive index layers includes a layer made of either ZnS or ZnSe, and a fluoride layer.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT