Mechanisms of forward laser harmonic emission from thin overdense plasmas

Coherent wake emission of high-order harmonics from overdense plasmas.

We present a new mechanism for high-order harmonic generation by reflection of a laser beam from an overdense plasma, efficient even at moderate laser intensities (down to Igamma2 approximately 4x10(15) W cm-2 microm2). In this mechanism, a transient phase matching between the electromagnetic field and plasma oscillations within a density gradient leads to the emission of harmonics up to the pl...

Three-halves harmonic emission from femtosecond laser produced plasmas

Measurements of three-halves harmonic radiation (3v0/2) produced by femtosecond, Ti:sapphire laser pulses (<2310 W/cm) in long density scale length plasmas generated from solid aluminum targets are presented. The 3v0/2 emission yield shows excellent agreement with theories of the two-plasmon decay instability in the predominantly linear regime. © 2002 American Institute of Physics. @DOI: 10.106...

Study of Laser-Hole Boring into Overdense Plasmas.

Modulation of harmonic emission spectra in relativistic laser interactions with overdense plasma

High-harmonic generation in plasmas from relativistic laser-electron scattering

Results are presented on the generation of high harmonics through the scattering of relativistic electrons from high-intensity laser light. The characteristic signatures of this process are found to be the emission of evenorder harmonics, linear dependence on the electron density, significant amount of harmonics with circular polarization, and small spatial extent of the source. The harmonics a...