NONLINEAR PULSE-COMPRESSION IN THE ULTRAVIOLET

We demonstrate that conditions of group velocity mismatch required for nonlinear pulse compression in the ultraviolet can be achieved using pulses with properly tilted fronts. We also show that nonlinear compre ssion of third-harmonic pulses can be performed in type I phase matchi ng configuration. Experimentally we demonstrate the 351-nm pulse compr ession from 1.3 ps down to 140 fs using the frequency tripling scheme with predelay time. (C) 1997 Elsevier Science B.V.