We report the first (to our knowledge) experimental results and numerical simulations on mid-IR femtosecond pulse filamentation in argon using 0.1 TW peak-power, 80 fs, 3.9 μm pulses. A broadband supercontinuum spanning the spectral range from 350 nm to 5 μm is generated, whereby about 4% of the mid-IR pulse energy is converted into the 350–1700 nm spectral region. These mid-IR–visible coherent continua offer a new, unique tool for time-resolved spectroscopy based on a mid-IR filamentation laser source.
© 2012 Optical Society of America
Original Manuscript: May 25, 2012
Revised Manuscript: July 11, 2012
Manuscript Accepted: July 11, 2012
Published: August 14, 2012
Daniil Kartashov, Skirmantas Ališauskas, Audrius Pugžlys, Alexander Voronin, Aleksei Zheltikov, Massimo Petrarca, Pierre Béjot, Jérôme Kasparian, Jean-Pierre Wolf, and Andrius Baltuška, "White light generation over three octaves by femtosecond filament at 3.9 µm in argon," Opt. Lett. 37, 3456-3458 (2012)