Comment on ''Generation of Electromagnetic Pulses from Plasma Channels Induced by Femtosecond Light Strings''

Shvets, Gennady ; Kaganovich, Igor ; and Startsev, Edward

Princeton University. Plasma Physics Laboratory.

关键词: Electromagnetic Pulses;    Excitation;    70 Plasma Physics And Fusion Technology;    Recombination;    Lasers;   

DOI  :  10.2172/809822
RP-ID  :  PPPL-3742
RP-ID  :  AC02-76CH03073
RP-ID  :  809822

美国|英语

来源: UNT Digital Library

【 摘 要 】

In a recent Letter, Cheng et al. calculated/predicted several new effects: that (a) fraction of the short laser pulse momentum can be imparted to plasma electrons via collisional damping of the laser, thereby exciting a long-lived (longer than an oscillation period) plasma wave, which (b) gives rise to a spatially uniform dipole moment of a plasma, which (c) emits far-field narrow-band radiation at the plasma frequency omega subscript ''p'' over the recombination time of the plasma. We claim that the calculation of the effect (a) is in error and the predicted effects (b,c) do not occur as described. In fact, predicted narrow-band emission at omega subscript ''p'' would not occur even if the momentum transfer and the dipole excitation were calculated correctly.