SUPER-REGENERATIVE SRS AMPLIFICATION OF FEMTOSECOND PULSES IN COMPRESSED HYDROGEN

An experimental study and numerical simulation of the amplification of femtosecond pulses on the basis of stimulated Raman scattering in com pressed hydrogen were made. For pumping by 350-fs pulses with energy o f 100 mu J of the second harmonic of radiation of a titanium-doped sap phire laser, the small-signal gain for 465-nm Stokes radiation separat ed out from the spectral continuum reached 10(10). The results of nume rical calculations quantitatively and qualitatively agree with the exp erimental results for the pump energies lying below the threshold of s pectral-continuum generation.