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(Received July 28, 1995) We examined several wavelength locking methods of laser diodes due to optical feedback using a diffraction-type grating, a distributed Bragg reflector or an optical bandpass filter. It was found that the wavelength locking method with the optical bandpass filter is the most suitable for second harmonic generation (SHG), based on laser diodes, using a domain-inverted LiTaO3 waveguide. The coupling efficiency of a laser diode to the optical waveguide was improved to 85 % by selecting the combination of coupling lenses. A compact SHG blue-light source was fabricated and the obtained blue light of 2.8 mW satisfied the primary specifications for use in an optical disk system.

An SHG Blue-light Source Using Domain-inverted Waveguide Device in LiTaO3.