Self-Shortening Dynamics Measured along a Femtosecond Laser Filament in Air

Journal Article · Fri Sep 17 04:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.125001· OSTI ID:21466969

Odhner, J H; Levis, R J ^[1]; Romanov, D A ^[2]

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1. Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122 (United States)
2. 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, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 105; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AIR
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY SPECTRA
EXCITED STATES
FILAMENTS
FLUIDS
GASES
HYDROGEN COMPOUNDS
LASER RADIATION
OXYGEN COMPOUNDS
PULSES
RADIATIONS
RAMAN EFFECT
RAMAN SPECTRA
SPECTRA
VIBRATIONAL STATES
WATER