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29 May 2002 XUV-IR multiphoton ionization
Pierre Agostini, Pierre-Marie Paul
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Proceedings Volume 4752, ICONO 2001: Ultrafast Phenomena and Strong Laser Fields; (2002) https://doi.org/10.1117/12.469103
Event: XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), 2001, Minsk, Belarus
Abstract
The production of short-pulse, coherent, XUV radiation by High Harmonic Generation (HHG) has become a routine operation in many laboratories equipped with an intense femtosecond Titanium-Sapphire laser. The required intensity of 1014 to 1015 W.cm-2 is easily reached with 1 - 2 mJ, 40 - 100 fs pulses focused by a long focal length lens (1m). The most usual medium for HHG is a noble gas. Xenon or argon are the most efficient ones (with efficiencies of the order of 10-5) while neon and helium allow for the generation of the shortest wavelengths (2 - 4 nm) albeit with a reduced efficiency (10-9 - 10-8). For symmetry reasons, only the odd harmonics of the fundamental frequency are generated and a typical spectrum like the one in Fig. 1 consists of narrow lines separated by twice the fundamental photon energy (1.55x2 eV in the case of Ti:Sap lasers). The harmonic pulses are naturally synchronized with the pump pulse and usually much shorter. This latter property combined to the high brightness, coherence and directivity of HH make them ideal for pump-probe experiments and particularly for multicolor- multiphoton transitions requiring a spatio-temporal overlap of the IR and XUV pulses. Such applications have been carried out in atomic and molecular and solid state Physics. The present work is about recent studies of multiphoton ionization of rare gas atoms by a superposition of HH and IR pulses and their applications to the metrology of femto and attosecond XUV pulses produced by HHG.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Pierre Agostini and Pierre-Marie Paul "XUV-IR multiphoton ionization", Proc. SPIE 4752, ICONO 2001: Ultrafast Phenomena and Strong Laser Fields, (29 May 2002); https://doi.org/10.1117/12.469103
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KEYWORDS
Ionization
Extreme ultraviolet
Chemical species
Dichroic materials
Argon
Absorption
Polarization
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