Уширение спектра фемтосекундного импульса излучения на длине волны 950 нм в материале с кубической нелинейностью

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/cm2 and plates thicknesses from 1 to 10 cm. The experimental conditions and a calculation model based on solving a system of nonlinear Schr¨odinger 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 compensa- tion 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