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Schematic experimental setup.
Images of the plasma grating induced in air by two crossing filaments. The crossing angle of the two filaments is 6.9° in (a) and 10° in (b).
Spectral gravity center of the 400 nm probe pulse detected in the direction of pulse 1 as a function of the delay between the two pumps in argon: (a) for pump pulse of 40 fs and (c) for pump pulses negatively chirped to 91.7 fs. The corresponding spectra of the 400 nm signal at different delays are respectively presented in (b) and (d) for the cases (a) and (c). In (c) the triangles stand for the case , the square for . The solid line shows the calculated results based on Eq. (3) for .
Spectral gravity center (a) and normalized spectrum (b) of the 400 nm signal as a function of the delay between the probe and the grating, . The pump pulses delayed by , are negatively chirped to 91.7 fs.
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