Temporal confinement of the harmonic emission through polarization gating |
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| Authors: | M Kovacev Y Mairesse E Priori H Merdji O Tcherbakoff P Monchicourt P Breger E Mével E Constant P Saliéres B Carré P Agostini |
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| Institution: | (1) Centre d Études de Saclay, Service des Photons Atomes et Molécules CEA-DSM-DRECAM, 91191 Gif-sur-Yvette, France;(2) INFM, Dipartimento di Fisica, Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;(3) CELIA, Université Bordeaux 1, Cours de la Libération, 33405 Talence, France |
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| Abstract: | We show experimentally that a simple optical setup is able to reduce the duration of the harmonic emission generated by  long (many optical cycles) laser pulses. By controlling the time-dependent ellipticity during the laser pulse, one can confine the harmonic emission to a narrow temporal window where the polarization is quasi-linear. The results obtained and their comparison with a simple model show a shortening of a factor 2 for harmonics located in the plateau region. Using shorter laser pulses of 15-20 fs duration should make it possible to isolate a single attosecond pulse.Received: 25 November 2002, Published online: 8 July 2003PACS:
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation - 32.80.Wr Other multiphoton processes |
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