Abstract

The nonlinear process of cross polarized wave (XPW) generation, which has been broadly used for temporal contrast enhancement and spectral broadening [1,2], continue to attract interest in different application schemes. A feature of space-time focusing (STF), which occurs at the focus of spatially dispersed beam, is to deliver highly localized intensity at the focus without incurring high non-linear losses during long distance propagation. A number of nonlinear optical processes have been used to study and to utilize STF: two-photon fluorescence [3], harmonic generation [4], plasma formation [5] and refractive index modification in solids [6]. In this paper XPW generation in BaF₂ has been studied at the SST conditions of a compressed femtosecond pulse.

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