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Efficient ultraviolet-light (345-nm) generation in a bulk LiIO3 crystal by frequency doubling of a self-seeded gain-switched AlGaInP Fabry–Perot semiconductor laser

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Abstract

A self-seeded gain-switched semiconductor laser is applied as a fundamental optical source to second-harmonic generation, and improvement of frequency-conversion efficiency is demonstrated. 345-nm ultraviolet light of 0.12-µW average power is generated in a bulk LiIO3 crystal for 690-nm fundamental light of 10.5-mW average power, which is composed of 500-MHz pulse trains emitted from an AlGaInP diode laser with a 68-ps temporal width and a 0.11-nm spectral bandwidth. It is clearly shown that the narrowing of the spectral bandwidth by the self-seeding technique gives rise to a normalized conversion efficiency of 0.218%/W cm, which is four times larger than that for pulses without seeding.

© 1997 Optical Society of America

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