The linear-to-elliptical transformation of a femtosecond-probe pulse in the birefringent filament in argon of an linearly polarized femtosecond-pump pulse is studied numerically and experimentally. The rotation of the probe elliptical polarization is the largest in the high-intensity filament core. With propagation, the rotated radiation diffracts outward by the pump-produced plasma. The transmission of the analyzer crossing the probe’s polarization is maximum at the pump–probe angle of and gives equal values for each pair of angles symmetrically situated at both sides of the maximum.
© 2010 Optical Society of America
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