The possibility of direct-frequency doubling of diode-laser output through waveguides has been investigated intensively. There are several methods for achieving the phase-matching condition; quasi-phase-matching (QPM) in the waveguide seems attractive, because it provides guided-mode, second-harmonics that could easily be collimated, and it enables the use of d33, the largest component of the second-order, nonlinear, optical coefficient in lithium niobate.1,2

© 1991 Optical Society of America

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