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Opt Express. 2008 Dec 22;16(26):21529-43.

Self-compression of 2 microm laser filaments.

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1
CEA-DAM, DIF, Bruyères-le-Châtel, F-91297 Arpajon, France. luc.berge@cea.fr

Abstract

We numerically study the filamentation of ultrashort laser pulses at 2 microm carrier wavelength in noble gases (argon, xenon) and in air. Compared with filamentation in the near-visible domain (800 nm), mid-infrared optical sources with durations close to a single cycle can be generically produced at various pressures and powers near the self-focusing threshold. The mechanism by which self-compression takes place mainly involves optical self-focusing, pulse steepening and plasma defocusing. On-axis spectra and spectral phases are discussed. Delivering single-cycled pulses at long wavelengths has important applications in the generation of high-order harmonics and isolated attosecond pulses.

PMID:
19104583
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