(Color online) Experimental set-up and timing of the two beams.
(Color online) Hydrodynamics profiles of the plasma along the laser axis at the beginning of the interaction beam (t = 1.5 ns) as given by hydrodynamics simulations for the 2 and 3ω experiments (a) electron temperature profiles, (b) electron density profiles, (c) expansion velocity profiles, and (d) corresponding SBS shift.
(Color online) Time-resolved SBS spectra measured in the (a) 3ω and (b) 2ω experiments at the threshold intensities.
(Color online) Time-resolved SBS spectra measured in the RPP experiment (left) and corresponding SBS gain as given by PIRANAH (right).
(Color online) SBS reflectivities as a function of time measured in the 2ω RPP experiment for different interaction beam intensities (left) and corresponding maximum instantaneous SBS reflectivities as a function of intensity (right).
(Color online) Time-integrated SBS reflectivities measured at 2 and 3ω as a function of the laser intensity: (a) direct backscattering measurements and (b) near backscattering measurements.
(Color online) SBS reflectivities as a function of the interaction beam intensity given by HERA compared to the measurements in the experiment at 2ω.
(Color online) Representation of the parameters P/Pc and α as defined in the main text in the 3ω (a) and 2ω (b) experiments.
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