Coherent terahertz radiation generation by a flattened Gaussian laser beam at a plasma–vacuum interface

Gupta, Devki Nandan; Jain, Arohi; Kulagin, V. V.; Hur, Min Sup; Suk, Hyyong

doi:10.1007/s00340-022-07777-z

Cited by 12 publications

(6 citation statements)

References 47 publications

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“…The possibility of generating THz pulses with an energy of approximately a millijoule was considered by Kwon et al (2018) theoretically and demonstrated by Zhang et al (2021) experimentally, at the same time, and in these articles, the conversion rate does not exceed one percent. Gupta et al (2022) propose the mechanism for increasing the energy of THz radiation by using a flattened Gaussian laser beam to impact on the plasma slab boundary, and in a review article (Liao & Li 2023), the authors discuss achievements and perspectives in the field of generation of THz radiation at laser-plasma interactions. One of the possible mechanisms for the significant increase in the THz pulse energy and conversion rate was theoretically proposed by Frolov (2023), where the action of p-polarized laser radiation on low-density targets was considered in the model of a semi-limited plasma.…”

Section: Introductionmentioning

confidence: 99%

Emission of terahertz pulses from near-critical plasma slab under action of p-polarized laser radiation

Frolov

2024

J. Plasma Phys.

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The theory of the terahertz (THz) waves emission from a near-critical plasma slab under the action of the focused p-polarized laser pulse is developed. The spectral, angular and energy characteristics of the THz signal are studied as functions of the focusing degree and the incidence angle of laser radiation, as well as the density and thickness of the plasma slab. It is shown that the extremely strong increase in the energy of the THz signal (up to millijoule level) and conversion rate (up to 10 %) occurs at the almost normal incidence of the ultra-short, tightly focused p-polarized laser pulse on the thin plasma slab with the near-critical density and rare electron collisions.

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Section: Introductionmentioning

confidence: 99%

Emission of terahertz pulses from near-critical plasma slab under action of p-polarized laser radiation

Frolov

2024

J. Plasma Phys.

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“…Another novel method, coherent transition radiation (CTR), occurs when an overdense electron bunch, produced by irradiating a relativistic laser on a solid target, passes through the vacuum-plasma interface and can emit THz pulses with an energy of 55 mJ and a peak electron field at 4 GV/m [32] . Numerous efforts have been dedicated to achieving tunable strong-field terahertz radiation using various approaches, such as plasma oscillation [33][34][35] and plasma slab methods [36] . However, most of these solutions have not been able to reach high field strengths.…”

Section: Introductionmentioning

confidence: 99%

Extremely powerful and frequency-tunable terahertz pulses from a table-top laser–plasma wiggler

Cai,

Shou,

Geng

et al. 2023

High Pow Laser Sci Eng

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The production of broadband, terawatt terahertz (THz) pulses has been demonstrated by irradiating relativistic lasers on solid targets. However, the generation of extremely powerful, narrow-band and frequency-tunable THz pulses remains a challenge. Here, we present a novel approach for such THz pulses, in which a plasma wiggler is elaborated by a tabletop laser and a near-critical density plasma. In such a wiggler, the laser-accelerated electrons emit THz radiations with a period closely related to the plasma thickness. The theoretical model and numerical simulations predict that a THz pulse with a laser-THz energy conversion of over 2.0%, an ultra-strong field exceeding 80 GV/m, a divergence angle of approximately 20 • and a center frequency tunable from 4.4 to 1.5 THz can be generated from a laser of 430 mJ. Furthermore, we demonstrate that this method can work across a wide range of laser and plasma parameters, offering potential for future applications with extremely powerful THz pulses.

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“…The CTR field resides in terahertz (THz) regime and benefit from the continuously energy supply from the driving electron beam, the CTR field is several orders of magnitude stronger than those involved in conventional THz acceleration scenarios [24][25][26][27][28][29]. It is different from the mechanisms for THz generation from an embedded plasma dipole [30] or a plasma-vacuum interface [31]. It is a simple and feasible route to utilize positron generation, injection, and acceleration in a single setup.…”

Section: Introductionmentioning

confidence: 99%

Positron acceleration by terahertz wave and electron beam in plasma channel

Shen

et al. 2023

New J. Phys.

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We present a scheme of positron acceleration by intense terahertz (THz) wave together with the driving large-charge electron beam in a plasma channel. The THz wave rapidly evolves into a transversely uniform acceleration field and a weakly focusing/defocusing lateral field in the channel. The THz wave is partially formed with the scheme of coherent transition radiation (CTR) when the electron beam goes through a metal foil and partially because of the wakefield in the plasma channel. The electron beam continuously supplies energy to the THz wave. Such a field structure offers the feasibility of long-distance positron acceleration while preserving beam quality. By two-dimensional simulations, we demonstrate the acceleration of positrons from initial 1 GeV to 126.8 GeV with a charge of ~10 pC over a distance of 1 m. The energy spread of accelerated positrons is 2.2%. This scheme can utilize the electron beam either from laser-driven or conventional accelerators, showing prospects towards high-quality and flexible THz-driven relativistic positron sources of ~100 GeV.

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Coherent terahertz radiation generation by a flattened Gaussian laser beam at a plasma–vacuum interface

Cited by 12 publications

References 47 publications

Emission of terahertz pulses from near-critical plasma slab under action of p-polarized laser radiation

Emission of terahertz pulses from near-critical plasma slab under action of p-polarized laser radiation

Extremely powerful and frequency-tunable terahertz pulses from a table-top laser–plasma wiggler

Positron acceleration by terahertz wave and electron beam in plasma channel

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