Formation of X -waves at fundamental and harmonics by infrared femtosecond pulse filamentation in air

We experimentally observe the formation of X -waves at fundamental, third harmonic, and fifth harmonic wavelengths by infrared (central wavelength at ∼ 1500   nm ) femtosecond laser pulse filamentation in air. By fitting the angularly resolved spectra of the fundamental and harmonic waves using X -w...

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Bibliographic Details
Published in:Applied physics letters 2008-12, Vol.93 (24), p.241104-241104-3
Main Authors: Xu, Han, Xiong, Hui, Fu, Yuxi, Yao, Jinping, Zhou, Zenghui, Cheng, Ya, Xu, Zhizhan, Chin, See Leang
Format: Article
Language:English
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Summary:We experimentally observe the formation of X -waves at fundamental, third harmonic, and fifth harmonic wavelengths by infrared (central wavelength at ∼ 1500   nm ) femtosecond laser pulse filamentation in air. By fitting the angularly resolved spectra of the fundamental and harmonic waves using X -wave relations, we confirm that all the X -waves have nearly the same group velocity, indicating that they are locked in space and time during their propagation in filament.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3050523