Two-dimensional collision of probe photons with relativistic ionization fronts.
The collision of a probe laser pulse with a relativistic ionization front is analyzed via two-dimensional ray-tracing theory and simulations. It is shown that collisions in higher dimensions lead to new regimes for the frequency upshift of the probe photons; the frequency upshift can be considerably higher for particular collision angles that maximize the interaction length with the ionization front gradient. Finite ionization fronts also lead to angle-dependent frequency upshifts, thus acting as diffraction gratings.
Dias
J M
JM
GoLP/Centro de Física de Plasmas, Instituto Superior Técnico, 1049-001 Lisboa, Portugal. jmdias@alfa.ist.utl.pt
Lopes
N C
NC
Silva
L O
LO
Figueira
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G
Mendonça
J T
JT