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X-shaped third harmonic generated by ultrashort infrared pulse filamentation in air

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6 Author(s)
Xu, Han ; State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China ; Xiong, Hui ; Ruxin Li ; Ya Cheng
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The authors report the measurement of the angularly resolved spectrum of the third harmonic generated in a femtosecond filament in air and its evolution with increasing pump power. Pumped by a focused infrared ultrashort pulse with a carrier wavelength of 1270 nm, a pulse duration of ∼20 fs, and pulse energy up to 487 μJ, the generated third harmonic is composed of an on-axis emission and a conical ring emission. When the pump power is sufficiently high, angularly resolved spectra with significant X-like feature could be observed, indicating the formation of nonlinear X wave at third harmonic.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 1 )

Date of Publication:

Jan 2008

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