Efficient terahertz and Brunel harmonic generation from air plasma via mid-infrared coherent control

Jang, Dogeun; Schwartz, R.; Woodbury, Daniel; Griff-McMahon, Jesse; Younis, Abdurrahman; Milchberg, H. M.; Kim, Ki-Yong

doi:10.1364/optica.6.001338

Cited by 56 publications

(37 citation statements)

References 37 publications

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“…Since then, two more experiments on two-color filamentation have demonstrated the significant enhancement of the THz yield for 3.9 μm laser pulses 91 , 92 . In both of them, THz radiation was studied as a part of the broadband supercontinuum generated by 3.9 μm two-color laser pulses jointly with the supercontinuum of higher harmonics.…”

Section: Thz Generationmentioning

confidence: 99%

Powerful terahertz waves from long-wavelength infrared laser filaments

Fedorov

Tzortzakis

2020

Light Sci Appl

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Strong terahertz (THz) electric and magnetic transients open up new horizons in science and applications. We review the most promising way of achieving sub-cycle THz pulses with extreme field strengths. During the nonlinear propagation of two-color mid-infrared and far-infrared ultrashort laser pulses, long, and thick plasma strings are produced, where strong photocurrents result in intense THz transients. The corresponding THz electric and magnetic field strengths can potentially reach the gigavolt per centimeter and kilotesla levels, respectively. The intensities of these THz fields enable extreme nonlinear optics and relativistic physics. We offer a comprehensive review, starting from the microscopic physical processes of light-matter interactions with mid-infrared and far-infrared ultrashort laser pulses, the theoretical and numerical advances in the nonlinear propagation of these laser fields, and the most important experimental demonstrations to date.

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Section: Thz Generationmentioning

confidence: 99%

Powerful terahertz waves from long-wavelength infrared laser filaments

Fedorov

Tzortzakis

2020

Light Sci Appl

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“…5(b), which are compared to the ∝(I(z)) 8 ionization yield of a linearly propagating pulse. These simulations were performed with a GPU implementation of the unidirectional pulse propagation equation, which includes the full molecular response of air [45,46]. The plots of Fig.…”

Section: Role Of Filament Plasma and Density Hole In High Voltage Brementioning

confidence: 99%

Dynamics of the femtosecond laser-triggered spark gap

et al. 2020

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We present space and time resolved measurements of the air hydrodynamics induced by femtosecond laser pulse excitation of the air gap between two electrodes at high potential difference. We explore both plasma-based and plasma-free gap excitation. The former uses the plasma left in the wake of femtosecond filamentation, while the latter exploits air heating by multiple-pulse resonant excitation of quantum molecular wavepackets. We find that the cumulative electrode-driven air density depression channel plays the dominant role in the gap evolution leading to breakdown. Femtosecond laser heating serves mainly to initiate the depression channel; the presence of filament plasma only augments the early heating.

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“…Powerful terahertz radiation sources have attracted considerable attention due to their applications in many fields of science [1][2][3], such as THz spectroscopy of condensed matter or biological issues [4][5][6], nonlinear THz optics [7], and resonant control of materials [8,9]. Conventional laser-based THz radiation sources include optical rectification from nonlinear crystals [10][11][12], two-color laser filamentation [13,14], and switched photoconducting antennnas [15]. The peak fields are limited to the order of a few MV/cm, and the radiation energies are smaller than 1 mJ.…”

Section: Introductionmentioning

confidence: 99%

Relativistic terahertz radiation generated by direct-laser-accelerated electrons from laser-foil interactions

2020

Phys. Rev. A

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A scheme for generating powerful terahertz (THz) radiation based on laser-solid interactions is proposed. When a p-polarized femtosecond laser impinges obliquely on a plane solid target and the target partially blocks the laser energy, surface electrons are extracted to the vacuum and accelerated by the laser fields, forming a low-divergence electron beam. A half-cycle THz radiation pulse is emitted simultaneously as the beam passes by the edge of the target, due to a mechanism similar to coherent transition radiation. Our particle-in-cell simulations show that a relativistic THz pulse can be obtained with an energy of a few tens of millijoule and a conversion efficiency above 1%, with existing joule level femtosecond laser sources.

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Efficient terahertz and Brunel harmonic generation from air plasma via mid-infrared coherent control

Cited by 56 publications

References 37 publications

Powerful terahertz waves from long-wavelength infrared laser filaments

Powerful terahertz waves from long-wavelength infrared laser filaments

Dynamics of the femtosecond laser-triggered spark gap

Relativistic terahertz radiation generated by direct-laser-accelerated electrons from laser-foil interactions

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