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Generation Of Broadband Thz Pulses By Laser Wakefield At Radial Boundary Of Plasma Column, Serge Y. Kalmykov, Alexander Englesbe, Jennifer Elle, Andreas Schmitt-Sody
Generation Of Broadband Thz Pulses By Laser Wakefield At Radial Boundary Of Plasma Column, Serge Y. Kalmykov, Alexander Englesbe, Jennifer Elle, Andreas Schmitt-Sody
Serge Youri Kalmykov
Photoionization of an ambient gas by a tightly focused, femtosecond, weakly relativistic laser pulse leaves behind
the pulse a column of electron density (a “filament”). At the column surface, the density drops to zero within a thin (micronscale) boundary layer. Ponderomotive force of the pulse drives within the filament a cylindrical wave of charge separation (laser wake). If the pulse waist size is much smaller than the Langmuir wavelength, electron current in the wake is mostly transverse. In the filament surface area, this current rapidly decays (electrons, crossing the sharp density gradient, phase out of wake within a few Langmuir …