Ricoh Company, Ltd.

Yusuke Okura

Naoto Jikutani

Kazuma Izumiya

Toshiyuki Ikeoh

Shinichi Harada

Kentaroh Hagita

Yoichi Ishikawa

Yuzuru Sasaki

Laser devices include a light source that emits a laser beam, an optical system that concentrates the laser beam emitted from the light source, an optical window through which the laser beam exited from the optical system passes, a housing that accommodates the optical system, and an optical window holding member fixed to the housing. The optical window holding member holds the optical window. In the first laser device, the optical window has a face or a protruding face through which the laser beam passes. When the optical window has the face, the face is flush with an edge of the optical window holding member and a film is formed on the face. When the optical window has the protruding face, the protruding face protrudes with reference to the edge of the optical window holding member and a film is formed on the protruding face.

Laser device and internal combustion engine

A surface-emitting laser includes an active layer on which a spacer layer is disposed, and a reflection mirror disposed on the spacer layer, including a current constriction layer that is a selectively-oxidized layer having been selectively oxidized. The current constriction layer is disposed at a position of a node of a standing-wave of an electric field of light oscillated at the active layer and is disposed away from an interface between the spacer layer and the reflection mirror by an optical distance of one-fourth of an oscillation wavelength at the active layer. The selectively-oxidized layer is made of AlGaAs. The reflection mirror includes at least one AlGaInP layer contacting the selectively-oxidized layer.

Surface-emitting laser, surface-emitting laser array, laser device, ignitor, internal combustion engine, optical scanner, image forming apparatus, light transmission module, and light emission system

Growing community of inventors

Kanagawa, Japan

Yusuke Okura