Abstract
An extended femtosecond filament is a nonlinear optical structure, which can emit a continuum of frequencies as well as quasi-isolated pulses in certain spectral ranges [1]. Generation of mid-infrared (MIR) ultrashort pulses can be enhanced by seeding the filament with the pulse at the central frequency close to its second harmonic [2]. With an 800 nm filament the coherent THz radiation can be delivered to the desired position far through the atmosphere, avoiding thereby strong water vapor absorption [3-5].
© 2015 IEEE
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