Wavelength changing device and laser beam generating apparatus

Vorrichtung zur Wellenlängenänderung und Laserstrahlerzeugungsgerät

Dispositif pour changer la longueur d'onde et appareil générateur d'un faisceau laser

Abstract

A wavelength changing device consists of a substrate made of LiTaO 3 , an optical waveguide extending in a central upper side of the substrate for transmitting 860 nm wavelength coherent light radiated from a semiconductor laser, a plurality of inverted polarization layers in the substrate, a dielectric film and a plurality of gratings periodically arranged on the dielectric film at regular intervals. The optical waveguide is formed according to a proton-exchange process. The gratings are made of photoresist material having a refractive index N1=1.5 and a high workability, and the gratings are uniformly formed according to an interference-exposure process. A periodic change in the refractive index is generated in a periodic structure of the gratings and the covering layer, and a part of the coherent light is reflected by the periodic structure to fix the wavelength of the coherent light radiated from the semiconductor laser.

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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    EP-0439350-A2July 31, 1991Oki Electric Industry Co., Ltd.Dispositif pour la génération d'onde seconde harmonique

NO-Patent Citations (1)

    Title
    SHINOZAKI K: "SECOND-HARMONIC GENERATION DEVICE WITH INTEGRATED PERIODICALLY DOMAIN-INVERTED REGIONS AND DISTRIBUTED BRAGG REFLECTOR IN A LINBO3 CHANNEL WAVEGUIDE", APPLIED PHYSICS LETTERS, vol. 58, no. 18, 6 May 1991 (1991-05-06), pages 1934 - 1936, XP000216104

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    Publication numberPublication dateAssigneeTitle