Optical product and method of manufacturing the optical product

Abstract

An optical product that is a cross dichroic prism formed by putting together vertexes forming right angles of a first prism element, a second prism element, a third prism element, and a fourth prism element made of glass that have a shape of a right isosceles triangle right prism and joining respective optical sides adjacent to one another among optical sides orthogonal to one another via dichroic films made of multilayer films, wherein, when a section between the optical side of the first prism element and the optical side of the second prism element is set as a first junction, a section between the optical side of the second prism element and the optical side of the third prism element is set as a second junction, a section between the optical side of the third prism element and the optical side of the fourth prism element is set as a third junction, and a section between the optical side of the fourth prism element and the optical side of the first prism element is set as a fourth junction, an uppermost layer of the dichroic film provided on the optical side of any one of the first to the fourth junctions is made of a silicon oxide layer and the silicon oxide layer of the uppermost layer of the dichroic film and the optical side are joined according to an optical contact method.