Pulse evolution in a photorefractive self-pumped phase conjugatorwith transmission grating geometry

摘要

The effect of grating dispersion on pulse evolution in anphotorefractive self-pumped phase conjugator is analyzed. The broadeningnfactors and the time-dependent phases of self-pumped phase-conjugatenpulses of unchirped and chirped Gaussian pulses are obtained. When thengrating dispersion and the angular dispersion cancel the materialndispersion, the self-pumped phase-conjugate pulse has a minimum width,nwhich is determined by the first-order dispersion of the grating. Thenself-pumped phase conjugation of an unchirped Gaussian pulse broadensnand is linearly chirped whereas the self-pumped phase conjugation of anchirped Gaussian pulse is compressed when the dispersion-induced chirpncancels the initial chirp