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7 March 2014 Study of filamentation compression in the near infrared in the 1.6 μm to 2 μm region for HHG experiments
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This investigation was conducted to study the tunability of the filamentation process using a near infrared laser source at wavelength ranging from 1.6 μm to 2 μm. A Krypton cell filled statically with 4 bar was employed as filamentation medium. A spectral broadening via filamentation was observed over the whole range of wavelengths employed and achieved broadening factor of 2-3. In best experimental conditions about 300nm of bandwidth where generated. The accumulated group velocity dispersion in the filament was compensated by fused silica since the dispersion of fused silica is negative at these wavelengths. It was possible to compress the pulses down to the few-cycle regime with 2-3 cycles for 1.7 μm, 1.8 μm and 1.9 μm. Theses pulses contained about 200 μJ pulse energy. Understanding the phenomenon of filamentaion at theses wavelengths bares significant potential for strong field physics applications such as attosecond science where longer wavelength and few-cycle pulses are of great advantage. As a proof of principle we used these few-cycle pulses to generate high harmonic spectra in several gases such as xenon, krypton, argon and nitrogen.
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Steffen Driever, Jean-Christophe Delagnes, Nikita Fedorov, Martin Arnold, Konstantin Holzner, Frederic Burgy, Dominique Descamp, Eric Cormier, Damien Bigourd, Amelle Zair, and Eric Constant "Study of filamentation compression in the near infrared in the 1.6 μm to 2 μm region for HHG experiments", Proc. SPIE 8984, Ultrafast Phenomena and Nanophotonics XVIII, 89841E (7 March 2014);

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