At least one surface of a plate member made of ZnSe has a concave-and-convex structure in which a projecting section and a groove section are formed at a spatial cycle equal to or lower than the wavelength of carbon dioxide laser light to thereby provide a substrate body. On a surface of the concave-and-convex structure, an antireflection film is layered that has a lower refractive index than that of ZnSe to carbon dioxide laser light. By this configuration, the polarization state of transmitted carbon dioxide laser light is converted from a linear polarization to a circular polarization or the like.
申请公布号
EP2383589(B1)
申请公布日期
2013.09.18
申请号
EP20110163649
申请日期
2011.04.26
申请人
OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION;SUMITOMO ELECTRIC INDUSTRIES, LTD.;SUMITOMO ELECTRIC HARDMETAL CORP.