Nippon Sheet Glass Company, Limited

Tokai University Educational System

Yukinari Sekiguchi

Kenichi Nakama

Terufusa Kunisada

Naoko Hikichi

Isao Muraguchi

Katsuhide Shimmo

Fumitoshi Kobayashi

Osamu Mikami

Yoshikazu Murata

Kentarou Miyazato

A polarizing filter has a laminate structure: wherein one to four layers of first dielectric thin filmsand one to four layers of second dielectric thin filmsare alternately laminated on a transparent flat substrateto form the laminate structure, the layers of second dielectric thin filmshaving a refractive index lower than that of the first dielectric thin filmswith respect to the wavelength of incident light; wherein one layer of the third dielectric thin filmhaving a refractive index intermediate between the refractive indices of the first and second dielectric thin films with respect to the wavelength of incident light is laminated on a surface of the laminate structure. In an optical device using the polarizing filter, the angle of incidence is set to be in a range of from 20 to 70 degrees.

Polarizing filter and optical device using the same

An optical connection device according to the invention is an optical connection device for optically coupling light propagated through an optical waveguide to an optical element arranged outside the optical waveguide and with the following configuration. Part of the optical waveguide is removed so as to be shaped like a groove. The optical waveguide and the optical element are arranged so that an optical axis of the optical waveguide intersects an optical axis of the optical element at a specified angle inside the groove. An optical unit is arranged at a position of intersection of the optical axes for turning light by reflection from one optical axis along the other optical axis.

Optical connection device

A diffraction optical element including an element body having a large number of grooves formed on its surface to form a grating, and a grating shape adjusting layer deposited on a grating surface of the element body by oblique incidence or material particles onto the grating surface, wherein the grating shape adjusting layer per se is made of a reflecting film material. By the grating shape adjusting layer, the contour shape of the resulting grating surface in a section perpendicular to a lengthwise direction of the grooves is made not similar to the sectional shape of the element body. A reflecting film may be formed on a grating shape adjusting layer made of another material. A reflecting film may be provided on the element body before a grating shape adjusting layer made of a transparent dielectric material is provided on the reflecting film.

Diffraction optical element and transfer mold therefor

An optical module is provided in which any conjugate ratio in an optical axis direction may be easily realized, the time duration for alignment may be shortened by using a passive alignment technique, and a large degree of may be obtained for any optical design. The optical module comprises a planar microlens array, a transparent substrate for adjusting a conjugate ratio of the optical module, and a guide substrate for optical fibers. The planar microlens array consists of a planar transparent substrate, in one surface thereof a plurality of circular microlenses are formed and arrayed. The transparent substrate includes a plurality of micro fitting recesses formed and arrayed in one surface thereof. The guide plate includes a plurality of micro guide holes opened therethrough.

Optical module and method for assembling the same

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Osaka, Japan

Yukinari Sekiguchi