Broadband and tunable mid-infrared laser source based on a transversal array of chirped filaments

A scheme for the generation of broadband and tunable mid-infrared pulses based on two-color filamentation in air is presented. The mid-infrared pulses, spanning the spectral region between 4 and 6.5 μm, result from a third-order nonlinear interaction between two short pulses, one at 800 nm and the o...

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Bibliographic Details
Published in:Applied physics letters 2012-12, Vol.101 (26)
Main Authors: Daigle, J.-F., Théberge, F., Roy, G., Châteauneuf, M., Dubois, J.
Format: Article
Language:English
Subjects:
Arrays
Broadband
Chirp
Filaments
Frequency doubling
Lasers
Short pulses
Spectra
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Summary:A scheme for the generation of broadband and tunable mid-infrared pulses based on two-color filamentation in air is presented. The mid-infrared pulses, spanning the spectral region between 4 and 6.5 μm, result from a third-order nonlinear interaction between two short pulses, one at 800 nm and the other at 437 nm. The latter was created by frequency doubling a Raman-shifted pulse at 873 nm amplified in a chirped-pulse Raman amplifier. Tunability of this mid-infrared laser source was provided by introducing spatial chirp across the fundamental pulse profile which created a transversal array of chirped filaments.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4773246