Self-Shortening Dynamics Measured along a Femtosecond Laser Filament in Air
Journal Article
·
· Physical Review Letters
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122 (United States)
- Department of Physics, and Temple University, Philadelphia, Pennsylvania 19122 (United States)
The filamentation-induced temporal shortening of a 40 femtosecond pulse propagating in air is traced using impulsive vibrational Raman scattering and measurement of the power spectrum as a function of position along the propagation axis. The N{sub 2}, O{sub 2}, and H{sub 2}O vibrational Raman responses reveal self-shortening of pulse features to 14 fs during the first filamentation cycle and to at least 9 fs in the second cycle. Spectral measurements further demonstrate that the coherent bandwidth generated in the region from 470 to 330 nm during the self-shortening process forms the {approx}9 fs pulse.
- OSTI ID:
- 21466969
- Journal Information:
- Physical Review Letters, Vol. 105, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.105.125001; (c) 2010 American Institute of Physics; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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