Abstract

We have prepared an optical fiber that produces efficient (0.24%) second-harmonic conversion by using mode-locked 1.064-μm laser pulses along with a harmonic seeding beam. The effective coherence length increased to 35 cm as compared with only a few centimeters in fibers prepared with mode-locked Q-switched pulses. We show that the input bandwidth of the pump pulse imposes a fundamental limit on the effective coherence length and that this length can be severely reduced by competing nonlinear effects.

© 1988 Optical Society of America

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