Abstract
AbstractIt is demonstrated by simulations and analysis that a wakefield driven by an ultrashort intense laser pulse in underdense plasma can emit tunable electromagnetic radiation along the laser propagation direction. The profile of such a kind of radiation is closely associated with the structure of the laser wakefield. In general, electromagnetic radiation in the terahertz range with its frequency a few times the electron plasma frequency can be generated in the moderate intensity regime. In the highly nonlinear case, a chain of radiation pulses is formed corresponding to the nonlinear structure of the wake. Study shows that the radiation is associated with the self-modulation process of the laser pulse in the wakefield and resulting transverse electron momenta from modulated asymmetric laser fields.
Highlights
Radiation generation in relativistic laser–plasma interaction has been a hot issue in the last two decades due to its wide application in medicine, biology, chemistry, etc
It is well known that the laser wakefield driven in homogeneous underdense plasma generally cannot produce radiation by itself
It is shown that, when an intense laser pulse propagates through homogeneous underdense plasma, tunable radiation in a wide frequency range can be produced in the wake of the laser pulse
Summary
Radiation generation in relativistic laser–plasma interaction has been a hot issue in the last two decades due to its wide application in medicine, biology, chemistry, etc. It is shown that electromagnetic radiation covering a wide frequency range from THz to XUV can be produced simultaneously with the laser wakefield excitation in underdense homogeneous plasmas.
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