Enhanced terahertz wave emission from air-plasma tailored by abruptly autofocusing laser beams

Lee, Kang; Koulouklidis, Anastasios D.; Papazoglou, D. G.; Tzortzakis, S.; Zhang, X.-C.

doi:10.1364/optica.3.000605

Cited by 74 publications

(24 citation statements)

References 33 publications

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“…Therefore, despite of the lower energy, such THz pulses allow one to achieve very high peak powers, which are necessary for studies of nonlinear interactions. Furthermore, with two-color filamentation it is possible to generate THz radiation remotely, solving propagation problems like diffraction and high absorption in atmospheric water vapor [28][29][30][31] . Note that here we are focusing on THz sources with central frequency within the well-accepted THz range of 0.1-10 THz, while above 10 THz central frequency sources with high powers have been shown in the past 32 .…”

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Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

et al. 2020

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Extreme nonlinear interactions of THz electromagnetic fields with matter are the next frontier in nonlinear optics. However, reaching this frontier in free space is limited by the existing lack of appropriate powerful THz sources. Here, we experimentally demonstrate that two-color filamentation of femtosecond mid-infrared laser pulses at 3.9 μm allows one to generate ultrashort sub-cycle THz pulses with sub-milijoule energy and THz conversion efficiency of 2.36%, resulting in THz field amplitudes above 100 MV cm −1. Our numerical simulations predict that the observed THz yield can be significantly upscaled by further optimizing the experimental setup. Finally, in order to demonstrate the strength of our THz source, we show that the generated THz pulses are powerful enough to induce nonlinear cross-phase modulation in electro-optic crystals. Our work paves the way toward free space extreme nonlinear THz optics using affordable table-top laser systems.

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Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

et al. 2020

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“…[ 13 ] These unusual characteristics are extraordinarily useful for a wide range of applications, such as medical laser treatment, [ 14 ] temporal cloaking, [ 15 ] photo‐polymerization, [ 16 ] and terahertz wave emission. [ 17 ]…”

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confidence: 99%

Generalized Ring Pearcey Beams with Tunable Autofocusing Properties

2021

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In this paper, generalized ring Pearcey beams are proposed theoretically and their corresponding generation is demonstrated experimentally by use of the double‐phase method. Generalized ring Pearcey beams evolve into circular or elliptical ring Pearcey beams, depending on the elliptical parameter. It is shown that the autofocusing properties of such beams can be effectively controlled by adjusting the elliptical parameter and the spatial distribution factor. To perform a more comprehensive investigation, the radially polarized forms of the beams are also realized in experiments. It is found that for both cases of vector and scalar, the peak intensity of the beams at the autofocusing plane undergo a dramatic increase as compared with that at the initial plane. Finally, by taking optical trapping as an example, it is proved that generalized ring Pearcey beams could be a productive instrument for industrial applications.

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“…Therefore, despite the lower energies, these THz pulses can have a very high intensity. Furthermore, two-color filamentation makes it possible to generate THz radiation remotely, thereby avoiding challenges such as the high absorption of THz waves in atmospheric water vapor [25][26][27][28] .…”

Section: Introductionmentioning

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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Enhanced terahertz wave emission from air-plasma tailored by abruptly autofocusing laser beams

Cited by 74 publications

References 33 publications

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

Generalized Ring Pearcey Beams with Tunable Autofocusing Properties

Powerful terahertz waves from long-wavelength infrared laser filaments

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