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(a) The scheme of the experimental setup, and (b) the dependence of the plasma grating on the field polarization and incident energy of the probe pulse. BS: beam splitter; 1/2 WP: half-wave plate; ND: adjustable neutral attenuator; L1 and L2: lens.
Far-field images of the pump and probe beams when the filament interaction was turned (a) off and (b) on.
The measured relative intensity of the SH pulse in the probe arm as a function of the delay of the SH pulse with respect to the FW pulses. Inset: the plasma grating at different time delay; SH signal in the pump (upper) and probe (bottom) arms, respectively, varied as the delay between pump and probe pulses for a fixed SH pulse delay of –100 fs.
The measured dependences of the SH pulse intensity in pump (red square) and probe (blue circle) beams on (a) the relative field polarization and (b) the pulse energy of the probe pulse.
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