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Femtosecond continua produced in gases

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2 Author(s)
Corkum, P.B. ; Nat. Res. Council, Ottawa, Ont., Canada ; Rolland, Claude

Self-focusing and continuum generation are explored in gases using ultrashort 625-nm pulses. Observations of spectral broadening and beam propagation in gases were made both below and above the self-focusing threshold. It is shown that the nonlinearity responsible for self-focusing and self-phase modulation saturates at an intensity of approximately 1013 W/cm2 in xenon. It was found that a diffraction-limited beam can be almost totally reconstructed spatially after passing through the focal region, even though self-focusing has been initiated. The spectrum, however, is catastrophically changed by the process. For intensities significantly above the self-focusing threshold, conical emission was observed. Most of the observations described herein were made using an ~90-fs, 625-nm pulse with a maximum energy of ~500 μJ

Published in:

Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 12 )

Date of Publication:

Dec 1989

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