US 5,349,600 AGranted

Solid state laser

AssigneeKokusai Denshin Denwa Kabushiki Kaisha

InventorsOsamu Shinbori, Yoshinori Mimura, Yukio Noda, Tetsuya Nakai

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Abstract

A high-output, single fundamental transverse mode solid state laser is disclosed which uses a semiconductor laser array as an excitation light source. The solid state laser comprises: a laser element which includes a core containing an element added as a laser medium, a cladding containing no such laser medium element, and reflecting mirrors coated over the cladding surface for repeatedly reflecting incident excitation light so that it may repeatedly pass through the core; an excitation light source formed by semi-conductor laser or light emitting diode array; means for guiding the excitation light from the excitation light source to one side of the laser element for incidence thereto; and a resonator for the oscillation of the solid state laser.

Claims6

Dependent claims

A high-output solid state laser of single functional mode of laser light comprising,

a high efficiency cylindrical laser glass rod core containing an element added as a laser medium and a cylindrical glass cladding disposed circumferentially of said rod core and longitudinally thereof concentrically therewith;
said glass cladding being free of an element acting as a laser medium and defining a narrow slit along a length thereof as an entrance window for excitation light to pass therethrough for incidence on said rod core along an optical axis thereof;
a source of said excitation light and means for focusing the excitation light on the surface of said glass cladding;
high incident light reflecting mirror surfaces formed on said glass cladding disposed for defining said narrow slit and for reflecting continuously excitation light passing through said rod core back accurately through the optical axis of the core so that incident light is accurately repeatedly reflected to the optical axis of the rod core for high efficiency absorption of the incident excitation light;
and
an optical resonator for developing laser oscillations along the optical axis of said rod core.

3 more elements

Dependencies are inferred from the claim text.