Two-Color Laser-Plasma Generation of Terahertz Radiation Using a Frequency-Tunable Half Harmonic of a Femtosecond Pulse

Vvedenskii, N. V.; Korytin, A. I.; Kostin, V. A.; Murzanev, A. A.; Silaev, A. A.; Степанов, А. Н.

doi:10.1103/physrevlett.112.055004

Cited by 119 publications

(81 citation statements)

References 33 publications

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“…Therefore, when the frequency of additional field is detuned from 2ω 0 , the maximum of low-frequency current spectrum corresponds to the detuning frequency ∆ω (in accordance with the results of the semiclassical model [3][4][5]). As can be seen from the formula (26), in the multiphoton regime ∂j/∂t is a complex function of φ.…”

Section: Discussionsupporting

confidence: 85%

“…The process of gas ionization by two-color laser pulses, containing the components with the frequency ratio close to two, is accompanied by excitation of the low-frequency current density (with frequencies much smaller than the frequency of the optical wave) [1][2][3][4][5]. The frequency detuning from the exact "synchronism" determines the frequency of the low-frequency current, which can be located in mid-infrared band [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…This can be used to generate short pulses of mid-infrared radiation [4]. The low-frequency current density excited during gas ionization by a two-color laser pulse has been previously calculated analytically and numerically with the help of semiclassical and quantum-mechanical approaches [1][2][3][4][5][6][7][8][9]. The semiclassical approach is based on the solution of the hydrodynamic equation for the electron current density and the equation for the density of free electrons with a quasi-static probability of tunneling ionization per unit time [10].…”

Section: Introductionmentioning

confidence: 99%

“…The frequency detuning from the exact "synchronism" determines the frequency of the low-frequency current, which can be located in mid-infrared band [3][4][5]. This can be used to generate short pulses of mid-infrared radiation [4].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quantum-Mechanical Description of Ionization-Induced Generation of Tunable Mid-Infrared Pulses

Silaev

Romanov

Kostin

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. The work is devoted to the analytical study of the excitation of low-frequency current density (with frequencies much smaller than the frequency of the optical wave) which radiates in mid-infrared band in the gas ionization by two-color laser pulses. We calculate the low-frequency current density using the analytical solution of time-dependent Schrödinger equation on the basis of strong-field approximation. Closed-form analytical formulas for the lowfrequency current density are obtained for laser-pulse parameters corresponding the tunneling and multiphoton ionization regimes. The features of excitation of low-frequency current density are analyzed in both regimes. IntroductionThe process of gas ionization by two-color laser pulses, containing the components with the frequency ratio close to two, is accompanied by excitation of the low-frequency current density (with frequencies much smaller than the frequency of the optical wave) [1][2][3][4][5]. The frequency detuning from the exact "synchronism" determines the frequency of the low-frequency current, which can be located in mid-infrared band [3][4][5]. This can be used to generate short pulses of mid-infrared radiation [4]. The low-frequency current density excited during gas ionization by a two-color laser pulse has been previously calculated analytically and numerically with the help of semiclassical and quantum-mechanical approaches [1][2][3][4][5][6][7][8][9]. The semiclassical approach is based on the solution of the hydrodynamic equation for the electron current density and the equation for the density of free electrons with a quasi-static probability of tunneling ionization per unit time [10]. The quantum-mechanical approach is based on the solution of the threedimensional time-dependent Schrödinger equation for the electron wave function [9,11]. The range of applicability of the semiclassical approach is limited by the laser pulse parameters corresponding to the tunneling ionization regime, at which the Keldysh parameter γ = I p /2U p [12] is much less than unity (here I p is the ionization potential of an atom, and U p is the ponderomotive energy of an electron in the laser field) [5,11,13]. For γ ≫ 1, the electron release occurs at a time of the order of the field period and greater, and to adequately calculate the low-frequency current density it is necessary to apply the quantum-mechanical approach.This work is devoted to the derivation of closed-form analytical expressions for the low-frequency current density on the basis quantum-mechanical approach using strong-field

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantum-Mechanical Description of Ionization-Induced Generation of Tunable Mid-Infrared Pulses

Silaev

Romanov

Kostin

et al. 2017

J. Phys.: Conf. Ser.

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“…It is based on a THz pulsed source and an electro-optical sampling device for the detection. The THz pulses are produced through plasma generation in gases with two-color femtosecond pulses [58,63,64,65,66]. A fraction of the output of a chirped pulse amplifier (CPA, 800 nm wavelength, 100 fs pulse duration, 7.5 mJ energy, 100 Hz repetition rate) is focused in dry nitrogen.…”

Section: Experimental Setup For Producing Molecular Orientationmentioning

confidence: 99%

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

et al. 2016

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We investigate experimentally and numerically the field-free orientation of the symmetric top molecule of methyl-iodide at high temperature using a terahertz radiation generated by a plasma induced by a two-color laser beam. The degree of orientation is measured from the free-induction decay emitted by the sample. The observed experimental signal is reproduced with a good accuracy by numerical simulations.

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Generation of electromagnetic waves in the terahertz frequency range by optical rectification of a Gaussian laser pulse in a plasma in presence of an externally applied static electric field

Singh

Kumar

Sharma

2017

Contrib. Plasma Phys

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We propose a theoretical model for the generation of electromagnetic waves in the terahertz (THz) frequency range by the optical rectification of a Gaussian laser pulse in a plasma with an applied static electric field transverse to the direction of propagation. A Gaussian laser pulse can exert a transverse component of the quasi‐static ponderomotive force on the electrons at a frequency in the THz range by a suitable choice of the laser pulse width. This nonlinear force is responsible for the density oscillation. The coupling of this oscillation with the drift velocity acquired by electrons due to the applied static electric field leads to the generation of a nonlinear current density. A spatial Gaussian intensity profile of the laser beam enhances the generated THz yield by many folds as compared to a uniform spatial intensity profile.

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Two-Color Laser-Plasma Generation of Terahertz Radiation Using a Frequency-Tunable Half Harmonic of a Femtosecond Pulse

Cited by 119 publications

References 33 publications

Quantum-Mechanical Description of Ionization-Induced Generation of Tunable Mid-Infrared Pulses

Quantum-Mechanical Description of Ionization-Induced Generation of Tunable Mid-Infrared Pulses

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

Generation of electromagnetic waves in the terahertz frequency range by optical rectification of a Gaussian laser pulse in a plasma in presence of an externally applied static electric field

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