Multi-Chromatic Ultrashort Pulse Filamentation and Bulk Modification in Dielectrics
Technical Report,01 Feb 2013,31 Jan 2016
Kennesaw State University Kennesaw United States
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This research investigated filamentation in, and modification of, dielectric solids by multi-chromatic ultrashort laser pulses. It was a theoretical effort to develop models of multi-chromatic laser-material interactions in bulk solids and couple these to pulse propagation simulations. The research developed techniques to control filamentation and the onset of laser-induced bulk damage with multi-chromatic pulses. This included controlling modification and filamentation in solids using co-propagating laser pulses of different frequencies as well as strongly chirped pulses and spatially chirped annular pulses. Emphasis was placed on nonlinear optical propagation effects since they determine the field distribution at the laser focus, the control of which is necessary for progress in laser bulk micro-machining towards nano-machining. Computationally efficient 3D quantum models of laser-induced photoionization and the electronic Kerr effect were developed for coupling with the already established pulse propagation methods.