Wavelength Scaling of Terahertz Generation by Gas Ionization

Clerici, Matteo; Peccianti, Marco; Schmidt, Bruno E.; Caspani, Lucia; Shalaby, Mostafa; Giguère, Mathieu; Lotti, Antonio; Couairon, Arnaud; Légaré, François; Ozaki, T.; Faccio, Daniele; Morandotti, Roberto

doi:10.1103/physrevlett.110.253901

Cited by 348 publications

(275 citation statements)

References 29 publications

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“…Such isolated attosecond pulses, covering photon energies from the extreme ultraviolet to X-rays, can find many applications for probing electron dynamics of atoms, molecules and condensed materials. Finally, waveform-optimized lasers are expected to have great impact on any intense laser-driven processes, including THz generation 32 , laser-plasma interactions 33 and particle Table 1). All three waveforms have comparable electric fields near the ionization times (close to À 0.4 optical cycles in the figure).…”

Section: Discussionmentioning

confidence: 99%

Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields

et al. 2014

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High-order harmonics extending to the X-ray region generated in a gas medium by intense lasers offer the potential for providing tabletop broadband light sources but so far are limited by their low conversion efficiency. Here we show that harmonics can be enhanced by one to two orders of magnitude without an increase in the total laser power if the laser's waveform is optimized by synthesizing two-or three-colour fields. The harmonics thus generated are also favourably phase-matched so that radiation is efficiently built up in the gas medium. Our results, combined with the emerging intense high-repetition MHz lasers, promise to increase harmonic yields by several orders to make harmonics feasible in the near future as general bright tabletop light sources, including intense attosecond pulses.

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Section: Discussionmentioning

confidence: 99%

Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields

et al. 2014

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“…Recently, a train of pulses, whose repetition intervals are synchronized with the classical rotational period of the molecules, have been shown to be efficient for the rotational excitation of diatomic molecules [13,14]. At present, because of the development of terahertz-wave technology [15][16][17], molecular orientation by rotationally resonant terahertz pulses has also been studied [18][19][20][21]. The elemental technology employed to create a train of pulses in the terahertz region has already been reported [22].…”

Section: Introductionmentioning

confidence: 99%

Unified parameter for localization in isotope-selective rotational excitation of diatomic molecules using a train of optical pulses

Matsuoka

2015

Phys. Rev. A

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We obtained a simple theoretical unified parameter for the characterization of rotational population propagation of diatomic molecules in a periodic train of resonant optical pulses.The parameter comprises the peak intensity and interval between the pulses, and the level energies of the initial and final rotational states of the molecule. Using the unified parameter, we can predict the upper and lower boundaries of probability localization on the rotational level network, including the effect of centrifugal distortion. The unified parameter was tentatively derived from an analytical expression obtained by performing rotating-wave approximation and spectral decomposition of the time-dependent Schrödinger equation under an assumption of time-order invariance. The validity of the parameter was confirmed by comparison with numerical simulations for isotope-selective rotational excitation of KCl molecules.

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“…Although the former has been ahead in terms of intensity, the availability and versatility of lasers are dominating time-resolved THz high-field science. The most prominent techniques for intense THz pulse generation, by employing a femtosecond amplified laser pulse, are based on laser-driven ion acceleration 16 , emission from a gas plasma 17 and optical rectification in inorganic (for example, LiNbO 3 ) 18 and organic nonlinear crystals (for example, 2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile) (OH1), 4-N,N-dimethylamino-4 0 -N 0 -methyl-stilbazolium tosylate (DAST), 4-N,N-dimethylamino-4 0 -N 0 -methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS)) [19][20][21] . So far, the peak fields from these systems have been limited to 0.12-0.5 GV m À 1 .…”

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Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness

2015

Self Cite

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The brightness of a light source defines its applicability to nonlinear phenomena in science. Bright low-frequency terahertz (o5 THz) radiation confined to a diffraction-limited spot size is a present hurdle because of the broad bandwidth and long wavelengths associated with terahertz (THz) pulses and because of the lack of THz wavefront correctors. Here using a present-technology system, we employ a wavefront manipulation concept with focusing optimization leading to spatio-temporal confinement of THz energy at its physical limits to the least possible three-dimensional light bullet volume of wavelength-cubic. Our scheme relies on finding the optimum settings of pump wavefront curvature and post generation beam divergence. This leads to a regime of extremely bright PW m À 2 level THz radiation with peak fields up to 8.3 GVm À 1 and 27.7 T surpassing by far any other system. The presented results are foreseen to have a great impact on nonlinear THz applications in different science disciplines.

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Wavelength Scaling of Terahertz Generation by Gas Ionization

Cited by 348 publications

References 29 publications

Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields

Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields

Unified parameter for localization in isotope-selective rotational excitation of diatomic molecules using a train of optical pulses

Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness

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