OPTICAL WAVEGUIDE DEVICE

摘要

PURPOSE:To decrease the feedback of unnecessary return light by diverging the laser beam emitted from the end face of an optical waveguide to a substrate and emitting this light as exit light from the end face of the substrate. CONSTITUTION:The exit side end face 12B is formed just before the exit side end face 11B of the substrate 11. The laser beam L 11 emitted from the exit side end face 12B progresses while diverging into the substrate 11 with respect to the exit face and is emitted as the laser beam L 12 from the exit side end face 11B of the substrate 11. The exit laser beam L 12 is condensed via a lens 6 and an object to be measured is irradiated with this light. A part of the laser beam L 11 emitted from the exit side end face 12B of the optical waveguide 12 of this time is reflected at the exit side end face 11B of the substrate 11 and such reflected light L 13 is reflected at the reflection angle equal to the incident angle of the laser beam L 11 and is diffused into the substrate 11. The return light to the optical waveguide 12 is decreased in this way.