TITLE

Propagation of ultrashort laser pulses in optically ionized gases

AUTHOR(S)
Morozov, A.; Luo, Y.; Suckewer, S.; Gordon, D. F.; Sprangle, P.
PUB. DATE
February 2010
SOURCE
Physics of Plasmas;Feb2010, Vol. 17 Issue 2, p023101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Propagation of 800 nm, 120 fs laser pulses with intensities of 4×1016 W/cm2 in supersonic gas jets of N2 and H2 is studied using a shear-type interferometer. The plasma density distribution resulting from photoionization is resolved in space and time with simultaneously measured initial neutral density distribution. A distinct difference in laser beam propagation distance is observed when comparing propagation in jets of H2 and N2. This is interpreted in terms of ionization induced refraction, which is stronger when electrons are produced from states of higher ionization potential. Three dimensional particle-in-cell simulations, based on directly solving the Maxwell–Lorentz system of equations, show the roles played by the forward Raman and ionization scattering instabilities, which further affect the propagation distance.
ACCESSION #
48352303

 

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