Strong-field phenomena caused by ultrashort laser pulses: Effective one- and two-dimensional quantum-mechanical descriptions

Silaev, A. A.; Ryabikin, M. Yu.; Vvedenskii, N. V.

doi:10.1103/physreva.82.033416

Cited by 43 publications

(41 citation statements)

References 85 publications

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“…(16). Thus the peak of the THz is not maximum at ϕ = 1.0 π , but rather at ϕ = 0.9 π for example, and will be intensity dependent [17,18]. Similar analysis can be applied to THz and 2D electron momentum spectra generated for atomic hydrogen by a two-color pulse where the intensity of the fundamental is raised to 2.26 × 10 14 W/cm 2 .…”

Section: Resultsmentioning

confidence: 92%

“…So far, the evidence supports the photocurrent model, in that ionization of the medium is indispensable [13,14], yet the mechanism behind the generation of THz remains unclear. A lot of theoretical calculations have been carried out in the past ten years by solving the time-dependent Schrödinger equation (TDSE) [8,[15][16][17][18] to study the THz signals versus the phase between the two colors of the laser, the intensity of the fundamental and of the second harmonic [17][18][19]. These TDSE calculations have shown consistent results among the studies, but the underlying mechanism remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of THz generation through the asymmetry of photoelectron angular distributions

2017

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We analyze the mechanism of THz generation in a gas medium with intense two-color infrared lasers pulses. The dependence of the amplitude of THz emission on the relative phase between the fundamental color (800 nm) and its second harmonic (400 nm) is shown to be identical to the residual current as well as to the asymmetry of the above-threshold-ionization (ATI) photoelectrons along the left versus the right side of the linear polarization axis of the laser, thus confirming the validity of the semiclassical photocurrent model for the THz emission. We further analyze the even vs odd angular momentum distributions of the ATI electrons. The degree of overlap between the even-parity dominant electrons and the odd-parity dominant electrons within each ATI peak determines the strength of the THz emission, thus favoring the model that THz is generated through free-free transitions in the laser field. A model is also provided to obtain the same phase dependence as the four-wave mixing model.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Analysis of THz generation through the asymmetry of photoelectron angular distributions

2017

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“…The corresponding electron current density [42] is given by J(t) = t −∞ a (t) dt and can be recast into…”

Section: B Time-dependent Schrödinger Equationmentioning

confidence: 99%

Theoretical study of terahertz generation from atoms and aligned molecules driven by two-color laser fields

et al. 2015

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We study the generation of terahertz radiation from atoms and molecules driven by an ultrashort fundamental laser and its second harmonic field by solving time-dependent Schrödinger equation (TDSE). The comparisons between one-, two-, and three-dimensional TDSE numerical simulations show that initial ionized wave-packet and its subsequent acceleration in the laser field and rescattering with long-range Coulomb potential play key roles. We also present the dependence of the optimum phase delay and yield of terahertz radiation on the laser intensity, wavelength, duration, and the ratio of two-color laser components. Terahertz wave generation from model hydrogen molecules are further investigated by comparing with high harmonic emission. It is found that the terahertz yield is following the alignment dependence of ionization rate, while the optimal two-color phase delays varies by a small amount when the alignment angle changes from 0 to 90 degrees, which reflects alignment dependence of attosecond electron dynamics. Finally we show that terahertz emission might be used to clarify the origin of interference in high harmonic generation from aligned molecules by coincidently measuring the angle-resolved THz yields.

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“…[1][2][3][4][5][6][7][8][9] The essence of this phenomenon can be explained as follows. In the process of ionization of atoms and molecules by an intense laser field, the newly born free electrons acquire, along with oscillatory velocity, the constant drift velocity.…”

Section: Introductionmentioning

confidence: 99%

Analytical description of generation of the residual current density in the plasma produced by a few-cycle laser pulse

Silaev

Vvedenskii

2015

Phys. Plasmas

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When a gas is ionized by a few-cycle laser pulse, some residual current density (RCD) of free electrons remains in the produced plasma after the passage of the laser pulse. This quasi-dc RCD is an initial impetus to plasma polarization and excitation of the plasma oscillations which can radiate terahertz (THz) waves. In this work, the analytical model for calculation of RCD excited by a fewcycle laser pulse is developed for the first time. The dependences of the RCD on the carrierenvelope phase (CEP), wavelength, duration, and intensity of the laser pulse are derived. It is shown that maximum RCD corresponding to optimal CEP increases with the laser pulse wavelength, which indicates the prospects of using mid-infrared few-cycle laser pulses in the schemes of generation of high-power THz pulses. Analytical formulas for optimal pulse intensity and maximum efficiency of excitation of the RCD are obtained. Basing on numerical solution of the 3D time-dependent Schr€ odinger equation for hydrogen atoms, RCD dependence on CEP is calculated in a wide range of wavelengths. High accuracy of analytical formulas is demonstrated at the laser pulse parameters which correspond to the tunneling regime of ionization. V C 2015 AIP Publishing LLC. [http://dx.

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Strong-field phenomena caused by ultrashort laser pulses: Effective one- and two-dimensional quantum-mechanical descriptions

Abstract: A. A. SILAEV, M. YU. RYABIKIN, AND N. V. VVEDENSKII PHYSICAL REVIEW A 82, 033416 (2010)

Cited by 43 publications

References 85 publications

Analysis of THz generation through the asymmetry of photoelectron angular distributions

Analysis of THz generation through the asymmetry of photoelectron angular distributions

Theoretical study of terahertz generation from atoms and aligned molecules driven by two-color laser fields

Analytical description of generation of the residual current density in the plasma produced by a few-cycle laser pulse

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