title: Raman amplification of ultrashort laser pulses in microcapillary plasmas.
abstract: Experimental evidences of Raman amplification of ultrashort pulses in microcapillary plasmas are presented. The amplification of 100-500 fs pulses was investigated in microcapillaries with different lengths. The experimental data, together with simulation results, indicate that the resonance condition for Raman amplification in high-density plasma, n(e) approximately 1-3x10(20) cm(-3), existed only in a very short plasma column. Such an assumption makes it possible to reconcile the experimental results and theoretical predictions. Investigations in very short microcapillaries (0.2-0.5 mm) with a broadband seed pulse further support this hypothesis and the amplification factor is in agreement with the linear growth rate.
authors.affiliation: Princeton University, New Jersey 08544, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Ping
authors.forename: I
authors.initials: I
authors.lastname: Geltner
authors.forename: A
authors.initials: A
authors.lastname: Morozov
authors.forename: N J
authors.initials: NJ
authors.lastname: Fisch
authors.forename: S
authors.initials: S
authors.lastname: Suckewer