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Feb 2013

Volume 20, Issue 2, Articles (02xxxx)

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Phys. Plasmas 20, 022303 (2013); http://dx.doi.org/10.1063/1.4790639 (12 pages)

Julio J. Martinell and Diego del-Castillo-Negrete
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back to top Radiation: Emission, Absorption, Transport
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The interaction of polarized microwaves with planar arrays of femtosecond laser-produced plasma filaments in air

Anca Marian, Mbark El Morsli, François Vidal, Stéphane Payeur, Marc Châteauneuf, Francis Théberge, Jacques Dubois, and Jean-Claude Kieffer

Phys. Plasmas 20, 023301 (2013); http://dx.doi.org/10.1063/1.4792160 (12 pages)

Online Publication Date: 14 February 2013

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The interaction of polarized microwaves with subwavelength arrays of parallel plasma filaments, such as those produced by the propagation of high-power femtosecond laser pulses in ambient air, was investigated by calculating the reflection and transmission coefficients as a function of the incidence angles using the finite-difference time-domain (FDTD) method. The time evolution of these coefficients was calculated and compared with experiments. It is found that the plasma filaments array becomes transparent when the polarization of the microwave radiation is perpendicular to the filaments axis, regardless the incidence angle of the microwave with respect to the filaments, except near grazing incidence. Increasing the filaments electron density or diameter, or decreasing the electron collision frequency or filaments spacing, decreases the transmission and increases the reflection. Transmission decreases when increasing the number of filament layers while reflection remains unchanged as the number of filament layers exceeds a given number (∼3 in our case). Transmission slightly increases when disorder is introduced in the filament arrays. The detailed calculation results are compared with those obtained from the simple birefringent slab model, which provides a convenient framework to calculate approximately the properties of filament arrays.
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52.38.Hb Self-focussing, channeling, and filamentation in plasmas
02.70.Bf Finite-difference methods
52.20.Fs Electron collisions
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Nonlinear absorption and harmonic generation of laser in a gas with anharmonic clusters

Manoj Kumar and V. K. Tripathi

Phys. Plasmas 20, 023302 (2013); http://dx.doi.org/10.1063/1.4793448 (5 pages)

Online Publication Date: 21 February 2013

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The nonlinear absorption and harmonic generation of intense short pulse laser in a gas embedded with anharmonic clusters are investigated theoretically. When the laser induced excursion of cluster electrons becomes comparable to cluster radius, the restoration force on electrons no longer remains linearly proportional to the excursion. As a consequence, the plasmon resonance is broadened, leading to broadband laser absorption. It also leads to second and third harmonic generations, at much higher level than the one due to ponderomotive nonlinearity. The harmonic yield is resonantly enhanced at the plasmon resonance ω = ωpe/math, where ω is the frequency of the laser and ωpe is the plasma frequency of cluster electrons.
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52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
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