Results 211 to 220 of about 33,512 (252)

High-Order Harmonic Generation in Laser-Product Ions

Shortwavelength V: Physics with Intense Laser Pulses, 1993
We have demonstrated high-order harmonic generation using ions in laser-produced plasmas. Ions of various elements in laser-produced plasmas have been used as nonlinear media for production of coherent short wavelength radiation.
, Kubodera, , Nagata, , Akiyama, , Midorikawa, , Obara, , Tashiro, , Toyoda   +6 more
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Relativistic high-order harmonic generation

Journal of Modern Optics, 2003
Abstract A relativistic generalization of the strong-field-approximation theory of high-order harmonic generation is presented. Numerical results for the harmonic spectra obtained by shining a strong laser pulse on multiply charged ions are analysed. Harmonic generation is explained using the tunnelling-propagation-recombination model.
D. B. MiloŜević, W. Becker
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Very High Order Harmonic Generation

Ultrafast Phenomena, 1990
Most of the previous experiments on harmonic generation in a gaseous medium used short incident wavelengths in order to obtain the shortest generated wavelengths. The purpose of the paper is to discuss experimental measurements of VUV light emission (355 - 30 nm) and in particular harmonic generation in a rare gas medium irradiated by an intense 1064 ...
L.A. Lompré, A. L’Huillier, M. Ferray, G. Mainfray   +3 more
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High-Order Harmonic Generation in Helium

Shortwavelength V: Physics with Intense Laser Pulses, 1993
We report the observation of harmonics up to 119th in helium, generated using a 1.053μm. 1ps CPA laser at intensities up to 3×1014 W/cm2 and have measured their spatial distribution. Complex spatial distributions are found for harmonics in the plateau region and near the cut-off, their angular distribution narrows to values similar to that predicted by
J. G. W. Tisch, R. A. Smith, M. Ciarrocca, J. P. Marangos, M. H. R. Hutchinson   +4 more
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High-Order Harmonic Generation

2001
Thanks to the invention of the laser in 1960, intensities never reached before became available allowing the observation of a number of new phenomena. Among them, the discovery in 1961 of optical harmonic generation by Franken et al. 1marked the birth of nonlinear optics, one of the richest field in optics that has found applications in nearly all ...
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High Order Harmonic generation with Molecules

Applications of High Field and Short Wavelength Sources VII, 1997
We present results for high order harmonic generation with atoms and molecules using high intensity laser light at 800 nm. Pulses of 150 fs duration were focused to peak intensities on the order of 1016 W/cm2 in a gas jet. The goal is to study the dependence of harmonic efficiency on polarizability, ionization potential and structure.
S. Evans, L.D. Van Woerkom
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Anomalous high-order harmonic generation

Journal of Physics B: Atomic, Molecular and Optical Physics, 2004
We present experimental harmonic spectra showing anomalously high orders generated at low laser intensities (around 2 × 1013 W cm−2) in argon, krypton and xenon. These high orders cannot be explained with the usual three step model that predicts the existence of a sharp cut-off after the region of constant efficiency called the plateau: the observed ...
Valentin, C., Kazamias, S., Douillet, D., Grillon, G., Lefrou, Thierry, Auge-Rochereau, Frederika, Lewenstein, M., Wyart, J.-F., Sebban, Stéphane, Balcou, Philippe   +9 more
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High-order harmonic generation and amplification

Applications of High Field and Short Wavelength Sources IX, 2001
High-order harmonic generation in a novel nonlinear medium with a controllable refractive index will be reported. Prospects for parametric amplification in the XUV range will be discussed.
Boris Chichkov, A. Egbert, C. Reinhardt, B. Wellegehausen   +3 more
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Molecular High Order Harmonic Generation

2008
We present, in this chapter, numerical results of high order harmonic generation spectra (HOHG), in the Born-Oppenheimer approximation, of the diatomic molecular ion H+ 2 and the linear triatomic molecule H2+ 3 under strong laser fields. We revisit, first, the standard electron classical re-collision model.
Andre D. Bandrauk, Samira Barmaki, Szczepan Chelkowski, Gerard Lagmago Kamta   +3 more
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Optimization of High-Order Harmonic Generation

High Field Interactions and Short Wavelength Generation, 1994
High-order harmonic generation of an intense, short-pulse laser, provides a way of generating high-intensity radiation in the extreme ultraviolet (XUV) and soft X-ray spectral regions. Using the Ti:Sapphire terawatt laser in Lund (150 mJ, 150 fs at 794 nm), we have observed up to the 105th harmonic (7.6 nm) generated in He.
C. Altucci, A. L’Huillier, E. Mevel, T. Starczewski, C.-G. Wahlström   +4 more
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