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Filamentation of 800nm femtosecond laser pulses in the conditions of strong two-photon absorption was first directly observed in As 4 Ge 30 S 66 chalcogenide glass, this effect being accompanied by increase in the pulse spectrum width from 8.5 to 11nm and its modulation indicating the pulse temporal splitting. In contrast, there was no filamentation and pulse spectrum widening...
Filamented propagation of femtosecond laser pulses in fused silica is studied using microscopy of Femtosecond Time-resolved Optical Polarigraphy (FTOP). Both super- and subluminal translation of axial intensity maxima in a 100fs time scale has been directly recorded. The observed spatio-temporal periodicity of the pulse shape in longitudinal and transversal directions is tentatively interpreted as...
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