REVISITING OPTICAL-PHASE CONJUGATION BY DIFFERENCE-FREQUENCY-GENERATION

Revisiting the pioneering work of Avizonis et al. [Appl. Phys. Lett. 3 1, 435 (1977)], we experimentally demonstrate that wave-front reversal of picosecond optical signals carl be efficiently achieved with low-g ain parametric amplification. The use of a KTP crystal permits forward phase conjugation of radiation with high divergence (40 mrad) and a b road spectrum (20 nm). The potential application of this this techniqu e to compensate ibr the group-velocity dispersion of standard optical fibers in the 1.55-mu m window is discussed. (C) 1996 Optical Society of America