Abstract

By combining erbium-doped fiber sources based on a large mode-area design and periodically poled lithium niobate, we have obtained single-pass conversion efficiencies of as much as 83% (energy efficiency) for second-harmonic generation into the near IR (768  nm) and of 34% for sum-frequency generation into the green (512  nm) for nanosecond pulses, using first-order quasi-phase matching. Pulse energies in excess of 80 µJ of second harmonic have been obtained from systems pumped by a single laser diode.

© 1998 Optical Society of America

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