Coulomb effects in directional current excitation in the ionization of gas by a two-color laser field

被引：14

作者：

Alexandrov, L. N. ^{[1
]}

Emelin, M. Yu ^{[1
,2
]}

Ryabikin, M. Yu ^{[1
,2
]}

机构：

[1] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603950, Russia

[2] NI Lobachevskii State Univ, Nizhnii Novgorod 603950, Russia

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2014年 / 47卷 / 20期

基金：

俄罗斯基础研究基金会;

关键词：

ionization; two-color field; THz pulses; Coulomb effects; TERAHERTZ-EMISSION; PULSES; AIR; GENERATION;

D O I：

10.1088/0953-4075/47/20/204028

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Macroscopic quasi-dc currents produced in gases ionized by intense two-color laser fields are known as an efficient source of highly intense broadband terahertz pulses. Recent experimental and theoretical studies give conflicting results regarding the optimal phase shift between the components of a two-color field to maximize the terahertz energy. To address these contradictions, we are studying the role of the effect of the Coulomb potential on the escaping electron in the formation of the ionization-induced directional photocurrents in a two-color scheme. We demonstrate that due to the Coulomb effects, the optimal phase shift between the fundamental field and its second harmonic strongly depends on the laser intensity. In a wide range of laser intensities, the Coulomb effects are shown to significantly influence the directional current generation.

引用

页数：7

共 29 条

[11] Analytical model for THz emissions induced by laser-gas interaction [J].

Debayle, A. ;

Gremillet, L. ;

Berge, L. ;

Koehler, Ch. .

OPTICS EXPRESS, 2014, 22 (11) :13691-13709

[12] TIME-DEPENDENT PROPAGATION OF HIGH-ENERGY LASER-BEAMS THROUGH ATMOSPHERE [J].

FLECK, JA ;

MORRIS, JR ;

FEIT, MD .

APPLIED PHYSICS, 1976, 10 (02) :129-160

[13] Optical-to-THz wave conversion via excitation of plasma oscillations in the tunneling-ionization process [J].

Gildenburg, V. B. ;

Vvedenskii, N. V. .

PHYSICAL REVIEW LETTERS, 2007, 98 (24)

[14] Coulomb asymmetry in above-threshold ionization [J].

Goreslavski, SP ;

Paulus, GG ;

Popruzhenko, SV ;

Shvetsov-Shilovski, NI .

PHYSICAL REVIEW LETTERS, 2004, 93 (23)

[15] Coherent Terahertz Echo of Tunnel Ionization in Gases [J].

Karpowicz, N. ;

Zhang, X. -C. .

PHYSICAL REVIEW LETTERS, 2009, 102 (09)

[16] Coherent control of terahertz supercontinuum generation in ultrafast laser-gas interactions [J].

Kim, K. Y. ;

Taylor, A. J. ;

Glownia, J. H. ;

Rodriguez, G. .

NATURE PHOTONICS, 2008, 2 (10) :605-609

[17] Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields [J].

Kim, K. Y. ;

Glownia, J. H. ;

Taylor, A. J. ;

Rodriguez, G. .

OPTICS EXPRESS, 2007, 15 (08) :4577-4584

[18] Determination of the carrier-envelope phase of few-cycle laser pulses with terahertz-emission spectroscopy [J].

Kress, Markus ;

Loffler, Torsten ;

Thomson, Mark D. ;

Dorner, Reinhard ;

Gimpel, Hartmut ;

Zrost, Karl ;

Ergler, Thorsten ;

Moshammer, Robert ;

Morgner, Uwe ;

Ullrich, Joachim ;

Roskos, Hartmut G. .

NATURE PHYSICS, 2006, 2 (05) :327-331

[19] Interference of electron trajectories and generation of high-order optical harmonics in a Coulomb system [J].

Platonenko, VT .

QUANTUM ELECTRONICS, 2001, 31 (01) :55-60

[20] Strong-field phenomena caused by ultrashort laser pulses: Effective one- and two-dimensional quantum-mechanical descriptions [J].

Silaev, A. A. ;

Ryabikin, M. Yu. ;

Vvedenskii, N. V. .

PHYSICAL REVIEW A, 2010, 82 (03)

← 1 2 3 →