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Enhanced harmonic conversion efficiency in the self-guided propagation of femtosecond ultraviolet laser pulses in argon |
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| Authors: | N Kortsalioudakis M Tatarakis N Vakakis SD Moustaizis M Franco B Prade A Mysyrowicz NA Papadogiannis A Couairon S Tzortzakis |
| Institution: | (1) Matter Structure and Laser Physics Laboratory, Department of Sciences, Physics Section, Technical University of Crete, Chania, 73100, Greece;(2) Technological Educational Institute of Crete, Chania, Crete, Greece;(3) Laboratoire d Optique Appliquée, CNRS UMR 7639, ENSTA – Ecole Polytechnique, 91761 Palaiseau, France;(4) Technological Educational Institute of Crete, Rethimno, Crete, Greece;(5) Centre de Physique Théorique, Ecole Polytechnique, CNRS UMR 7644, 91128 Palaiseau, France;(6) Laboratoire dUtilisation des Lasers Intenses, Ecole Polytechnique, CNRS UMR 7605, 91128 Palaiseau, France |
| Abstract: | Harmonic generation during the self-guided propagation of femtosecond ultraviolet (UV) laser pulses (248-nm, 450-fs) in argon is investigated. The third (82.7-nm) and fifth (49.6-nm) harmonics are generated in the UV filament. The energy-conversion efficiencies for the harmonics are found to be at least two orders of magnitude higher than those reported in the literature for similar gas pressures. The enhancement is attributed to the quasi-phase matching of the harmonics due to the self-guiding of the driving pulse. PACS 42.25.Bs; 42.65.Jx; 42.65.Re; 42.65.Ky |
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