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Title: Efficient Attosecond Phenomena in the Relativistic {lambda}3 Regime

Abstract

Particle-in-cell simulations of relativistically strong laser pulses interacting with overdense plasma targets predict that coherent motion of electrons leads to the efficient generation of strong attosecond electromagnetic pulses and dense attosecond electron bunches. The optimal conditions for these attosecond phenomena are achieved in the {lambda}3 regime, when few-cycle laser pulses are focused to a wavelength-limited spot, producing maximal intensity and maximal gradients with a given energy. The natural synchronism of these attosecond phenomena should enable a kind of relativistic attosecond optoelectronics.

Authors:
;  [1];  [2];  [2];  [3];  [2]
  1. Laboratoire d'Optique Appliquee, 91761 Palaiseau (France)
  2. (United States)
  3. Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109 (United States)
Publication Date:
OSTI Identifier:
20798508
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 827; Journal Issue: 1; Conference: 3. international conference on superstrong fields in plasmas, Varenna (Italy), 19-24 Sep 2005; Other Information: DOI: 10.1063/1.2195198; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTROMAGNETIC PULSES; ELECTRONS; LASER RADIATION; LASERS; PLASMA HEATING; PLASMA SIMULATION; RELATIVISTIC PLASMA; RELATIVISTIC RANGE; WAVELENGTHS

Citation Formats

Naumova, Natalia, Mourou, Gerard, Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109, FOCUS Center, University of Michigan, Ann Arbor, MI 48109, Nees, John, and FOCUS Center, University of Michigan, Ann Arbor, MI 48109. Efficient Attosecond Phenomena in the Relativistic {lambda}3 Regime. United States: N. p., 2006. Web. doi:10.1063/1.2195198.
Naumova, Natalia, Mourou, Gerard, Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109, FOCUS Center, University of Michigan, Ann Arbor, MI 48109, Nees, John, & FOCUS Center, University of Michigan, Ann Arbor, MI 48109. Efficient Attosecond Phenomena in the Relativistic {lambda}3 Regime. United States. doi:10.1063/1.2195198.
Naumova, Natalia, Mourou, Gerard, Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109, FOCUS Center, University of Michigan, Ann Arbor, MI 48109, Nees, John, and FOCUS Center, University of Michigan, Ann Arbor, MI 48109. Fri . "Efficient Attosecond Phenomena in the Relativistic {lambda}3 Regime". United States. doi:10.1063/1.2195198.
@article{osti_20798508,
title = {Efficient Attosecond Phenomena in the Relativistic {lambda}3 Regime},
author = {Naumova, Natalia and Mourou, Gerard and Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109 and FOCUS Center, University of Michigan, Ann Arbor, MI 48109 and Nees, John and FOCUS Center, University of Michigan, Ann Arbor, MI 48109},
abstractNote = {Particle-in-cell simulations of relativistically strong laser pulses interacting with overdense plasma targets predict that coherent motion of electrons leads to the efficient generation of strong attosecond electromagnetic pulses and dense attosecond electron bunches. The optimal conditions for these attosecond phenomena are achieved in the {lambda}3 regime, when few-cycle laser pulses are focused to a wavelength-limited spot, producing maximal intensity and maximal gradients with a given energy. The natural synchronism of these attosecond phenomena should enable a kind of relativistic attosecond optoelectronics.},
doi = {10.1063/1.2195198},
journal = {AIP Conference Proceedings},
number = 1,
volume = 827,
place = {United States},
year = {Fri Apr 07 00:00:00 EDT 2006},
month = {Fri Apr 07 00:00:00 EDT 2006}
}
  • Theory of the attosecond pulse generation during the interaction of a short relativistic-irradiance laser pulse with a thin overdense plasma slab is developed. The nonlinear electric current caused by the electron motion at relativistic velocity generates the high-order harmonics of the incident radiation. These harmonics are phase locked and can produce pulses with attosecond duration after spectral filtering. Conditions for the most efficient generation of single-attosecond pulses are discussed. A very efficient regime of attosecond pulse train generation without spectral filtering is proposed. The results are verified by the particle-in-cell simulations.
  • We perform a time-dependent analysis of four-wave mixing (FWM) in a double-{lambda} system in an ultraslow-propagation regime and obtain the analytical expressions of pulsed probe laser, FWM-generated pulse, phase shifts and absorption coefficients, group velocities, and FWM efficiency. With these analytical expressions, we show that an efficiently generated FWM field can acquire the same ultraslow group velocity (V{sub g}/c{approx}10{sup -4}-10{sup -5}) and pulse shape of a probe pump and that the maximum FWM efficiency is greater than 25%, which is orders of magnitude larger than previous FWM schemes in the ultraslow-propagation regime.
  • High-harmonic generation with excitation pulses shorter than 25fs is studied theoretically using a 3D model. For very short excitation pulses, a new regime of harmonic generation by a {open_quotes}single-cycle{close_quotes} of the driver pulse can be reached. In this regime, the temporal coherence of the adjacent harmonic orders is dramatically improved compared with longer excitation pulses, even though the discrete harmonic structure in the emission disappears. X-ray pulses as short as 100attoseconds can be emitted, with increased conversion efficiency of laser-to-harmonic radiation. {copyright} {ital 1997} {ital The American Physical Society}
  • Spin correlations for the {Lambda}{Lambda} and {Lambda}{Lambda}-bar pairs, generated in relativistic heavy-ion collisions, and related angular correlations at the joint registration of hadronic decays of two hyperons, in which space parity is not conserved, are analyzed. The correlation tensor components can be derived from the double angular distribution of products of two decays by the method of 'moments'. The properties of the 'trace' of the correlation tensor (a sum of three diagonal components), determining the relative fractions of the triplet states and singlet state of respective pairs, are discussed. Spin correlations for two identical particles ({Lambda}{Lambda}) and two nonidentical particlesmore » ({Lambda}{Lambda}-bar) are considered from the viewpoint of the conventional model of one-particle sources. In the framework of this model, correlations vanish at sufficiently large relative momenta. However, under these conditions, in the case of two nonidentical particles ({Lambda}{Lambda}-bar) a noticeable role is played by two-particle annihilation (two-quark, two-gluon) sources, which lead to the difference of the correlation tensor from zero. In particular, such a situation may arise when the system passes through the 'mixed phase.'« less