Long distance filamentation of 400 nm femtosecond laser pulses in air View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2009-08-04

AUTHORS

Z. Zhang, X. Lu, T.-T. Xi, W.-X. Liang, Z.-Q. Hao, Y. Zhang, M.-L. Zhou, Z.-H. Wang, J. Zhang

ABSTRACT

The characteristics of the light filaments formed by λ=400 nm blue femtosecond laser pulses are experimentally investigated. Both pre-focused and free propagation conditions are studied. The diameter, length and electron density were measured by using fluorescence signal imaging and longitudinal diffraction method. About 2×1017 cm−3 electron density in filaments was achieved with beam pre-focusing. In the free propagation case, the multi-filamentation can be observed over 70 m propagation distance, and the energy in the filament core is only about 30 μJ. The effects of energy reservoir on the filament core have been investigated by inserting a diaphragm in a selected single filament path to block the energy of the reservoir. The evolution of filamentation has been studied experimentally as a function of diaphragm size. The energy reservoir can be extended to about 10 mm from the filament core. The results indicate that the up conversion of laser is a possible way to enhance the utilization of laser energy for the generation of long filaments. More... »

PAGES

207-213

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00340-009-3663-0

DOI

http://dx.doi.org/10.1007/s00340-009-3663-0

DIMENSIONS

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