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Experimental and numerical studies of a temporal evolution of a light bulletformed in isotropic LiF by Mid IR femtosecond pulse (2500 to 3250 nm) of power,slightly exceeding the critical power for self-focusing, are presented. For thefirst time regular oscillations of the light bullet intensity during itspropagation in a filament were registered by investigation of induced colorcenters in LiF. It was revealed that color centers in a single laser pulsefilament have a strictly periodic structure with a length of separate sectionsabout 30 mcm, which increases with a laser pulse wavelength decreasing. It wasshown that the origin of light bullet modulation is a periodical change of thelight field amplitude of an extremely compressed single cycle wave packet in afilament, due to the difference of the wave packet group velocity and thecarrier wave phase velocity.

Regular "Breathing" of Single-Cycle Light Bullets in Mid-IR Filament