Spectral broadening of femtosecond pulses during SRS in hydrogen

Abstract

Abstract It was shown that the spectral broadening of femtosecond laser pulses during stimulated Raman scattering (SRS) in hydrogen is determined by two nonlinear processes leading to phase modulation of the laser wave. Namely, the dependence of the refractive index of the gas on the intensity of laser radiation and the dependence of the refractive index on the ratio of the number of molecules at the ground and first vibrational levels of the hydrogen molecule, which changes during SRS.