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
Original Manuscript: December 8, 1987
Manuscript Accepted: March 15, 1988
Published: June 1, 1988
H. W. K. Tom, R. H. Stolen, G. D. Aumiller, and W. Pleibel, "Preparation of long-coherence-length second-harmonic-generating optical fibers by using mode-locked pulses," Opt. Lett. 13, 512-514 (1988)