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Filamentation of beam shaped femtosecond laser pulses in gases and liquids

Filamentation of beam shaped femtosecond laser pulses in gases and liquids,10.1109/CLEOE.2011.5942809,Pavel Polynkin,Stacy Shiffler,Craig Ament,Mirosl

Filamentation of beam shaped femtosecond laser pulses in gases and liquids  
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second dual pulse excitation of plasma in air and other gases. In this technique, the femtosecond laser pulse with an ultrahigh peak power but moderate pulse energy creates seed filaments at a target location, and the free-charge density in these seed filaments is boosted by the subsequent application of a nanosecond high-energy pulse. Thus generated dense plasma channels and channel arrays can be used in various applications including guiding microwaves and THz-wave generation. As a separate effort, we conduct various experiments on filament characterization . For example, by recording diffraction patterns formed by weak collimated probe pulses on femtosecond laser filaments [5], we conducted tests of the recently proposed new theory of laser filamentation in gases that is based on higher-order Kerr effect (HOKE) as the main regularization mechanism in laser filaments [6].
Published in 2011.
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