Superluminal light propagation in optical amplifiers based on diode-pumped Nd:YVO_4 crystal

摘要

The group velocity of an optical pulse in an optical amplifier in the presence of population oscillations was studied both theoretically and experimentally. The superluminal propagation of harmonically modulated light was measured in a diode-pumped Nd:YVO_4 crystal. The resonant phase shift was found to have resonance at the frequency of population relaxation.