Multimillijoule terahertz radiation from laser interactions with microplasma waveguides

Hu, Ke; Yi, Longqing; Fülöp, Tünde

doi:10.1088/1361-6587/abdcdc

Cited by 9 publications

(8 citation statements)

References 34 publications

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“…[20] Moreover, Hu et al found that multi-millijoule THz can be generated from micro-plasma waveguides through coherent diffraction radiation. [21] Nowadays, it was found that the plasmonic electrostatic waves can be coupled into electromagnetic modes in many ways. It was proposed by Sheng et al that laser wakefields driven by ultrashort intense laser pulses in longitudinally inhomogeneous plasmas can be converted via linear mode conversion to powerful THz emission with field strength up to a few tens of MV cm −1 .…”

Section: Introductionmentioning

confidence: 99%

Tunable High‐Field Terahertz Radiation from Plasma Channels

Wang

Chen

Zhang

et al. 2023

Laser & Photonics Reviews

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Tunable broadband terahertz (THz) sources with power at the gigawatt level are desirable for many applications. A scheme to generate such THz emission by off-axially injecting a weakly relativistic ultrashort laser into a parabolic plasma channel is presented. By utilizing two-dimensional particle-in-cell simulation, it is demonstrated that there are two major physical mechanisms involved, i.e., linear mode conversion from laser wakefields and the electromagnetic waveguide mode excitation inside the plasma channel. The two radiation modes can lead to linearly polarized and radially polarized THz emissions, respectively, with distinct frequency spectra and spatial distributions. It is found that they predominate alternatively with the change of the plasma channel length. For a given plasma channel, one can switch the radiation modes by adjusting the injection position and the injection angle of the laser pulse. In particular, the radiation mode of the linear mode conversion can produce THz pulses with the peak amplitude of sub-GV cm −1 with the energy conversion efficiency ≈10 −3 , even though the peak power of the incident laser is just at the terawatt level. The scheme provides a powerful THz source with tunable intensity, spatial distributions, spectra, and polarizations by simply adjusting the injection conditions of incident laser pulses.

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Section: Introductionmentioning

confidence: 99%

Tunable High‐Field Terahertz Radiation from Plasma Channels

Wang

Chen

Zhang

et al. 2023

Laser & Photonics Reviews

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“…In recent years, research has been carried out in order to increase the efficiency of THz radiation, including the research of Hu et al [23], which was conducted in 2021, and the efficiency was reported to be around 6%. The THz efficiency produced by the frequency difference of Hermite Cosh Gaussian lasers in hot electron-collisional plasma was reported to be approximately 0.08 [24].…”

Section: Introductionmentioning

confidence: 99%

Generating High Efficiency Terahertz Radiation From Relativistic Nano-Bunches in the Interaction of Ultrarelativistic Lasers With Thin Solid Targets

Moshkelgosha

Tavakoli

2022

IEEE Trans. Plasma Sci.

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The interaction of femtosecond laser pulses with thin solid targets is one of the most efficient methods to obtain terahertz (THz) radiation. In the specific conditions, the electron of plasma surface distribution became so localized and nanobunches are formed which causes coherent synchrotron emission (CSE). In this mechanism which occurs when the relativistic laser is obliquely incident on plasma, the plasma electrons gather in a very dense and thin layer of nanometer width. The electrons of nano-bunch can emit intense coherent emissions in different ranges of electromagnetic radiation. In this study, producing high-efficiency THz radiating from relativistic nano-bunches is discussed. The effect of plasma and nano-bunch parameters, the mobility of ions, the initial thermal velocity of electrons, and the speed of electrons are investigated. According to the results, the direct relation between the width of the nano-bunch and the efficiency is seen. The nonlinear relation between the initial thermal velocity of electrons and the THz yield is seen. In the desirable conditions, a high THz yield of up to 37% is obtained from nano-bunches with the initial thermal velocities as 0.3 of light speed.

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“…The saturation of HHG energy is associated with the suppression of surface wave amplitude, which is responsible for harmonics generation and converting the SAM of fundamental light to the OAM of the harmonics [29]. As a high-power laser propagates in a plasma waveguide, it extracts electrons out of channel wall and accelerate them [40,41]. The total charge of such electrons as shown by the red lines in Fig.…”

mentioning

confidence: 99%

High-efficient harmonic vortex generation from a laser irradiated hollow-cone target

Hu¹,

Yi²

2023

Preprint

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It has been recently reported that ultraviolet harmonic vortices can be produced when a highpower circular-polarized laser pulse travels through a micro-scale waveguide. However, the harmonic generation quenches typically after a few tens of microns of propagation, due to the build-up of electrostatic potential that suppresses the amplitude of the surface wave. Here we propose to utilize a hollow-cone channel to overcome this obstacle. When traveling in a cone target, the laser intensity gradually increases, allowing the surface wave to maintain a high amplitude for a much longer distance. The harmonic vortices can be produced with very high efficiency. According to three-dimensional particle-in-cell simulations, the overall efficiency are boosted by almost one order of magnitude, reaching > 20%. It is also found that using the cone targets can mitigate efficiency decline due to pre-heating of plasma by laser prepulse. The proposed scheme paves the way to the development of powerful optical vortices sources in the extreme ultraviolet regime -an area of significant fundamental and applied physics potential.

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Multimillijoule terahertz radiation from laser interactions with microplasma waveguides

Cited by 9 publications

References 34 publications

Tunable High‐Field Terahertz Radiation from Plasma Channels

Tunable High‐Field Terahertz Radiation from Plasma Channels

Generating High Efficiency Terahertz Radiation From Relativistic Nano-Bunches in the Interaction of Ultrarelativistic Lasers With Thin Solid Targets

High-efficient harmonic vortex generation from a laser irradiated hollow-cone target

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