Accession Number : ADA260092
Title : Nonlinear Analysis of Relativistic Harmonic Generation by Intense Lasers in Plasmas
Descriptive Note : Interim rept.
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s) : Esarey, Eric ; Ting, Antonio ; Sprangle, Phillip ; Umstadtert, Donald ; Liu, X
Report Date : 08 Jan 1993
Pagination or Media Count : 32
Abstract : A linearly polarized, ultra-intense laser field induces transverse plasma currents which are highly relativistic and nonlinear, resulting in the generation of coherent harmonic radiation in the forward direction (i.e., co- propagating with the incident laser field). A nonlinear cold fluid model, valid for ultrahigh intensities, is formulated and used to analyze relativistic harmonic generation. The plasma density response is included self-consistency and is shown to significantly reduce the current driving the harmonic radiation. Phase detuning severely limits the growth of the harmonic radiation. The effects of diffraction are considered in the mildly relativistic limit. No third harmonic signal will emerge from a uniform plasma of near infinite extent. A finite third harmonic signal requires the use of a semi-infinite or finite slab plasma. For an initially uniform plasma, no second harmonic radiation is generated. Generation of even harmonics requires transverse gradients in the initial plasma density profile.
Descriptors : *PLASMAS(PHYSICS) , *NONLINEAR ANALYSIS , *FIELD INTENSITY , *HARMONIC GENERATORS , DENSITY , RADIATION , PHASE , PROFILES , RESPONSE , TRANSVERSE , DETUNING , GRADIENTS , FLUIDS , SIGNALS , DIFFRACTION , CONSISTENCY , LASERS , MODELS
Subject Categories : Lasers and Masers
Plasma Physics and Magnetohydrodynamics
Distribution Statement : APPROVED FOR PUBLIC RELEASE