Abstract
Experimental results on the evolution, as a function of pressure, of the supercontinuum spectrum generated in CO 2 gas (1–40 atm) by weakly focussed 1 ps pulses at 593 nm are described. They are adequately fitted by a self-phase modulation model including the effect of self-steepening of the pulse. Above a given pressure optical breakdown appears in the gas. Optical breakdown during supercontinuum generation affects differently the behaviour of the red and blue side broadening since the blue side stops broadening after a certain pressure while the red side keeps increasing.
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