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Emissions from single filaments in air triggered by tailored background energy flows

: Walter, Dominik; Bürsing, Helge; Ebert, Reinhard


Optics Letters 42 (2017), No.5, pp.931-934
ISSN: 0146-9592
Journal Article
Fraunhofer IOSB ()

We investigated emission patterns from single or few
filaments in air created by femtosecond laser pulses with
spatially modulated wavefronts. For 800 nm filaments, spiral
emissions can be obtained in the infrared. Time-resolved
analysis of the corresponding dynamics of the energy surrounding the filament reveals stable energy flows with angular momentum that interact with the filament and with each other. Changing this energy distribution by modulation
of the wavefront of the initial laser pulse directly affects the emission behavior of the filament.