Abstract

The linear-to-elliptical transformation of a 400nm femtosecond-probe pulse in the birefringent filament in argon of an 800nm 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 45° 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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