Catastrophic collapse of ultrashort pulses

摘要: We investigate theoretically the self-focusing dynamics of an ultrashort laser pulse both near and above threshold at which effectively undergoes catastrophic collapse. find that, as a result space-time focusing self-steepening, "optical shock" wave forms inside medium that gives rise to broad blueshifted pedestal in transmitted spectrum. Our results are good agreement with primary features observed experiments thus provide theoretical understanding for underlying process "white-light" generation.