Abstract: A laser device includes a substrate including a principal surface and a recess provided in the principal surface; a laser oscillation unit fixed to the principal surface in direct contact with the principal surface or with an adhesive interposed between the laser oscillation unit and the principal surface, the laser oscillation unit having an emission surface from which laser light that diverges as the laser light travels is emitted along the principal surface; and a reflecting member fixed to a bottom surface of the recess and having an inclined surface that is inclined with respect to the principal surface so as to reflect the laser light. At least a portion of the inclined surface is positioned in a space inside the recess.

Abstract: A semiconductor laser device is provided, which comprises a semiconductor laser element having a light emission surface, a reflective member having a reflective surface, and a light diffusing member provided between the light emission surface and the reflective surface. The light emission surface and the reflective surface face each other so that an external resonance cavity is provided therebetween. Scattered light is emitted from the light diffusing member.

Abstract: A semiconductor laser device is provided, which comprises a semiconductor laser element having a light emission surface, a reflective member having a reflective surface, and a light diffusing member provided between the light emission surface and the reflective surface. The light emission surface and the reflective surface face each other so that an external resonance cavity is provided therebetween. Scattered light is emitted from the light diffusing member.