Terahertz radiation from the vacuum-plasma interface driven by ultrashort intense laser pulses

Sheng, Zheng-Ming; Wu, Hui‐Chun; Li, Kun; Zhang, Jie

doi:10.1103/physreve.69.025401

Cited by 79 publications

(29 citation statements)

References 23 publications

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“…In references [32,53,54], this temporally-confined emission is interpreted using phase matching arguments. In these articles, the emission at ω p (x) is actually considered to occur when k P O matches the wave vector, around its turning point, of an electromagnetic wave of frequency ω = ω p (x), emerging from the density gradient with an angle θ.…”

Section: Observation In Pic Simulationsmentioning

confidence: 99%

High-order harmonic and attosecond pulse generation on plasma mirrors: basic mechanisms

Thaury¹,

Quéré²

2010

J. Phys. B: At. Mol. Opt. Phys.

202

199

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To cite this version:Cédric Thaury, F Quéré. High-order harmonic and attosecond pulse generation on plasma mirrors: basic mechanisms. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2010, 43 (21) When an intense femtosecond laser pulse hits an optically-polished surface, it generates a dense plasma that itself acts as a mirror, known as a plasma mirror. As this mirror reflects the highintensity laser field, its non-linear temporal response can lead to a periodic temporal distortion of the reflected wave, associated to a train of attosecond light pulses, and, in the frequency domain, to the generation of high-order harmonics of the laser. This paper presents detailed theoretical and numerical analysis of the two dominant harmonic generation mechanisms identified so far, Coherent Wake Emission and the Relativistic Oscillating Mirror. Parametric studies of the emission efficiency are presented in these two regimes, and the phase properties of the corresponding harmonics are discussed. This theoretical study is complemented by a synthesis of recent experimental results, which establishes that these two mechanisms indeed dominate harmonic generation on plasma mirrors.

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Section: Observation In Pic Simulationsmentioning

confidence: 99%

High-order harmonic and attosecond pulse generation on plasma mirrors: basic mechanisms

Thaury¹,

Quéré²

2010

J. Phys. B: At. Mol. Opt. Phys.

202

199

View full text Add to dashboard Cite

show abstract

“…But the mechanism of THz generation from the laser induced plasma turns out be complicated [9] involved of wave propagation, plasma formation, oscillation and collision. For example, the * zhao.zengxiu@gmail.com THz can be emitted by the radical acceleration of the ionized electrons due to the ponderomotive force generated by the radial intensity gradient of the optical beam [10], or by linear mode conversion from the laser-induced plasma wakefield in inhomogeneous plasma [11,12], or by Cerenkov-type mechanism from light propagating within the filament [13].…”

Section: Introductionmentioning

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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“…A few of other schemes based on gas plasma have also been proposed, such as the linear mode conversion scheme with an ultraintense laser by driving wakefields in inhomogeneous underdense plasma [24][25][26][27][28], the Cherenkov-like emission scheme with an intense laser in a plasma-gas channel [29,30], the bias electric field scheme in plasma [31,32], and the mid-infrared laser scheme in gases [33].…”

mentioning

confidence: 99%

Terahertz radiation by two-color lasers due to the field ionization of gases

Wang

Sheng

et al. 2013

Phys. Rev. E

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Terahertz (THz) radiation via the two-color laser scheme is investigated theoretically and numerically when the second laser is at different harmonic orders of the main laser. It is found that THz radiation can be generated only when the second laser is an even harmonic and the THz field strength does not show a simple scaling with the two laser amplitudes, suggesting that it is different from a nonlinear optics processes. The THz strength generally tends to decrease with the increase of the even harmonic order. The strength is also sensitive to the carrier envelope (CE) phases of both the two laser pulses even if their durations are quite long. With different CE phases, the strength can be proportional to either sine or cosine of the relative phase displacement of the two lasers. For a given gas target except hydrogen, it increases with the laser amplitude between several saturation plateaus, each corresponding to a different ionization level. For a given main laser intensity, there is an optimized intensity of the second laser for the strongest THz radiation.

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Terahertz radiation from the vacuum-plasma interface driven by ultrashort intense laser pulses

Cited by 79 publications

References 23 publications

High-order harmonic and attosecond pulse generation on plasma mirrors: basic mechanisms

High-order harmonic and attosecond pulse generation on plasma mirrors: basic mechanisms

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

Terahertz radiation by two-color lasers due to the field ionization of gases

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