Experimental investigation of intracavity stimulated Raman scattering conversion of ultrashort pulses in an actively mode-locked laser

An investigation was made of the energy and time characteristics of the radiation under conditions of intracavity stimulated Raman scattering (STRS) conversion in hydrogen using ultrashort pulses emitted by an actively mode-locked ruby laser. Dependences of the efficiency of conversion of the laser radiation to the first Stokes component on the hydrogen pressure and on the laser pumping rate were obtained. Both these dependences had a maximum. Time measurements demonstrated some narrowing of a single pulse of the first Stokes component and a decrease in the number of pulses in a train, compared with the laser radiation pulses.