Effect of Pump-Probe Polarization and Crystal Orientation on Propagation of Flat Top Pulse in ${\rm Ce{:}BaTiO}_{3}$ via Degenerate Two-Wave Mixing

The propagation of flat top pulse is studied inside the crystal via degenerate two-wave mixing as a function of various polarization states of a pump-probe beam. Subluminal as well as superluminal pulse propagation is observed by tuning the crystal orientation for S-S and P-S polarization states of a pump-probe laser beam.