COMPUTER-SIMULATION OF ULTRA-SHORT OPTICAL PULSE-PROPAGATION IN SOLIDAND HOLLOW WAVE-GUIDES

We examine effects of higher order dispersion and optical non-linearit y, including linear attenuation on intense short pulses propagating al ong solid and Noble-gas-filled waveguides. In order to simulate realis tic pulse and spectral shapes. we have taken into account quadratic an d cubic dispersion as well as Raman (solid wave-guide) and 'shock' non linear terms in the generalized Schrodinger equation of propagation. T he phonon oscillation corresponding to 13.3 THz in SiO2 gets superimpo sed on to the exit pulse in the normal dispersion regime of solid fibe r for lengths exceeding root 6L(D)L(NL). The super continuum spectrum from hollow Noble-gas-filled fibers shows remarkably deep modulations.