Spectral dips in ion emission emerging from ultrashort laser-driven plasmas.
Deep dips in MeV ion spectra are obtained from water droplet targets irradiated by intense [(0.5-1.2) x 10(19) W/cm(2)] and ultrashort (35 fs) laser pulses. The existence of these dips is ascribed to the generation of a multielectron-temperature plasma, which is confirmed by our experiments. An existing fluid model based on hot-electron components with significantly different temperatures is consistent with the behavior we observe in the ion spectra of the femtosecond laser-driven interaction. The model provides a good simulation of the observed spectral dips and allows us to establish important parameters such as hot- and cold-electron temperatures and the respective electron density ratios. The result may be of interest for spectral tailoring of proton spectra in future applications of laser-generated proton beams.
Ter-Avetisyan
S
S
Max-Born-Institut, Max-Born-Strasse 2a, D-12489 Berlin, Germany.
Schnürer
M
M
Busch
S
S
Risse
E
E
Nickles
P V
PV
Sandner
W
W