Spectrum broadening of femtosecond radiation pulse at 950 nm wavelength in material with cubic nonlinearity

The conditions for spectrum broadening of 60 fs radiation pulse at a central wavelength 950 nm in fused quartz plates due to phase self-modulation are studied experimentally and theoretically. The studies are conducted at radiation intensities from 50 to 400 GW/cm$^2$ and plates thicknesses from 1 to 10 cm. The experimental conditions and a calculation model based on solving a system of nonlinear Schrödinger equations in the approximation of a slowly changing wave are described. The possibility of compressing radiation pulse with a broadened spectrum in case of quadratic nonlinear phase compensation is estimated. It is shown that in case spectrum broadening it is possible to reduce the spectrally limited duration by no more than two times.