Abstract
By now, the many potential applications of a rugged blue laser source are well established, for instance printing, displays, and optical storage. In a longer time perspective, the direct-emitting blue and green semiconductor lasers are of course the most promising candidates. For the near-term supply of solid-state blue lasers, however, various hybrid approaches are being pursued. Examples include intracavity doubling in ring cavity lasers or in microchip lasers, and the approach that has been studied at SDL: single-pass frequency doubling of diode lasers in quasi-phase- matching (QPM) waveguides.
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