Raman amplification in KGW crystal at femtosecond pumping

Stimulated Raman scattering (SRS) is a traditional method for laser frequency conversion. Last time much attention is paid to Raman conversion in crystal mediums, because it opens new perspectives for development of solid-state laser systems. Raman conversion of femtosecond pulses faces difficulties connected with transient conditions and competition with other nonlinear effects. This work presents the results on investigation of the spectral characteristics of Raman amplification at femtosecond pumping in KGW crystal. Based from results, the dependence of spectral bandwidth and form of the Raman amplification on chirp of the femtosecond pump pulses was found. The maximum bandwidth is reached under the minimal chirp of the femtosecond pump pulses. Effects of the other factors, such as intensity of pump, orientation of KGW crystal, on Raman amplification spectrum were investigated.