Optimization of the focused flux of high harmonics |
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Authors: | Email author" target="_blank">S?KazamiasEmail author D?Douillet C?Valentin Th?Lefrou G?Grillon G?Mullot F?Augé P?Mercére Ph?Zeitoun Ph?Balcou |
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Institution: | (1) Laboratoire dOptique Appliquée, ENSTA-École Polytechnique(CNRS UMR 7639), 91761 Palaiseau Cedex, France;(2) Laboratoire dInteraction du rayonnement X avec la Matiére, Université Paris-Sud, bâtiment 350, 91405 Orsay Cedex, France |
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Abstract: | Following the theoretical predictions 1], the observation of two-photon processes by interaction of vacuum ultraviolet (VUV) radiation with inner-shell levels of atoms requires focused intensities in the 1013-1014 W/cm2 range. Our aim is to reach this regime in order to study non-linear optics at these wavelengths. We first optimized the high harmonic conversion efficiency in argon by studying the best experimental conditions for phase-matching, concentrating on focus geometry related to laser energy, cell length and position relative to the focus. We then studied the resulting harmonic beam focusability by a toroidal mirror (f=10 cm) and made an image of the harmonic focus. We conclude with an evaluation of the focused intensity that we are able to reach experimentally.Received: 28 January 2003, Published online: 24 April 2003PACS:
32.80.Rm Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states) - 42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation |
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