Photoluminescence and Terahertz Emission from Femtosecond Laser-Induced Plasma Channels
W. Hoyer, J. V. Moloney, E. M. Wright, A. Knorr, M. Kira, S. W. Koch
Abstract
Luminescence as a mechanism for terahertz emission from femtosecond laser-induced plasmas is studied. By using a fully microscopic theory, Coulomb scattering between electrons and ions is shown to lead to luminescence even for a spatially homogeneous plasma. The spectral features introduced by the rod geometry of laser-induced plasma channels in air are discussed on the basis of a generalized mode-function analysis.
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