Nonlinear pulse compression and temporal soliton generation with tilted pulses

Summary form only given. Three-wave interaction of ultrashort light pulses is always affected by group-velocity mismatch (GVM) which tends to separate the interacting pulses, and group-velocity dispersion (GVD), responsible for pulse broadening. There are two relevant regimes of pulse compression via three-wave interaction in X/sup (2)/ materials: (i) if the GVM dominates and the low-frequency pulses run with opposite velocities respect to the high-frequency one, then interaction could lead to the so called "nonlinear pulse compression" (NPC), (ii) if the GVD dominates and has the same sign for all three waves, then mutually-trapped dispersion-free bright temporal solitons [soliton pulse compression (SPC)] are attained.