Spatiotemporal visualization of the terahertz emission during high-power laser-matter interaction

Gopal, A.; Woldegeorgis, A.; Herzer, S.; Almassarani, Mohammed

doi:10.1103/physreve.100.053203

Cited by 9 publications

(8 citation statements)

References 45 publications

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“…Energetic electron emission and ion acceleration have been suggested, separately [31][32][33][34][35] or jointly [36][37][38][39][40], to be responsible for the THz generation at the rear side of laserirradiated solid targets. Nevertheless, how to identify the respective roles played by electrons and ions under diverse conditions remains an open question [37].…”

Section: Theory and Modelingmentioning

confidence: 99%

“…This scenario was not considered previously in conventional accelerators [16] and gas plasmas [24] because of the absence of strong sheath fields. After laser interactions, the net charge in the sheath decays over time, and as a result, the moving electron sheath behaves like a longitudinal transient current, thereby giving rise to electromagnetic radiation referred to as the sheath radiation (SR) [36][37][38][39][40]. Figure 1(a) sketches these radiation scenarios.…”

Section: Theory and Modelingmentioning

confidence: 99%

“…Very recently, multimillijoule THz pulses have been demonstrated experimentally [31]. For the THz emissions from the rear side of a solid target [31][32][33][34][35][36][37][38][39][40], a number of studies have been reported on the influence of laser and target parameters on the THz radiation, and several distinct models have been proposed to understand the specific experimental observations. Nevertheless, the distinctions of these models and their respective contributions to the global THz radiation remain elusive, even under comparable laser conditions [32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…For the THz emissions from the rear side of a solid target [31][32][33][34][35][36][37][38][39][40], a number of studies have been reported on the influence of laser and target parameters on the THz radiation, and several distinct models have been proposed to understand the specific experimental observations. Nevertheless, the distinctions of these models and their respective contributions to the global THz radiation remain elusive, even under comparable laser conditions [32][33][34][35][36][37][38][39][40]. It should also be noted that almost all of the relevant experiments are performed in the femtosecond laser regime [32][33][34][35][36][37][38][39][40], and little attention has been given specifically to the control of THz spectra.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the distinctions of these models and their respective contributions to the global THz radiation remain elusive, even under comparable laser conditions [32][33][34][35][36][37][38][39][40]. It should also be noted that almost all of the relevant experiments are performed in the femtosecond laser regime [32][33][34][35][36][37][38][39][40], and little attention has been given specifically to the control of THz spectra. Apparently, it is essential to investigate the THz properties in a broader parameter space for better understanding THzgeneration physics and broadening THz applications.…”

Section: Introductionmentioning

confidence: 99%

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Towards Terawatt-Scale Spectrally Tunable Terahertz Pulses via Relativistic Laser-Foil Interactions

et al. 2020

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An ever-increasing number of strong-field applications, such as ultrafast coherent control over matter and light, require driver light pulses that are both high power and spectrally tunable. The realization of such a source in the terahertz (THz) band has long been a formidable challenge. Here, we demonstrate, via experiment and theory, efficient production of terawatt (TW)-level THz pulses from high-intensity picosecond laser irradiation on a metal foil. It is shown that the THz spectrum can be manipulated effectively by tuning the laser pulse duration or target size. A general analytical framework for THz generation is developed, involving both the high-current electron emission and a time-varying electron sheath at the target rear, and the spectral tunability is found to stem from the change of the dominant THz generation mechanism. In addition to being an ultrabright source (brightness temperature of about 10 21 K) for extreme THz science, the THz radiation presented here also enables a unique in situ laser-plasma diagnostic. Employing the THz radiation to quantify the escaping electrons and the transient sheath shows good agreement with experimental measurements.

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Section: Theory and Modelingmentioning

confidence: 99%

Section: Theory and Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Towards Terawatt-Scale Spectrally Tunable Terahertz Pulses via Relativistic Laser-Foil Interactions

et al. 2020

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Perspectives on ultraintense laser-driven terahertz radiation from plasmas

Liao,

2023

Physics of Plasmas

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High-power terahertz (THz) radiation is fundamental to numerous applications in many fields. Ultraintense laser-produced plasmas have attracted ever-increasing interest as a damage-free medium for generating high-peak-power THz pulses. This article gives the authors' perspectives on how the field of ultraintense laser-driven THz radiation from plasmas developed and where the field is headed. In particular, recent advances and some new ideas are outlined in terms of THz genesis, metrology, and applications. In addition to pushing the limits of achievable THz pulse energies and peak powers, much attention will be paid on the tunability of THz properties. Single-shot THz metrology will develop toward multi-dimensional resolution. The resulting extreme THz radiation offers immense opportunities in the THz control over matter and THz-driven strong-field physics. A selection of illustrative application cases in the field of materials, chemistry, and biology are briefly discussed. In the authors' opinion, the concerted advances in these aspects will propel this field into the bright future.

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Intense low-noise terahertz generation by relativistic laser irradiating near-critical-density plasma

et al. 2023

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Low-noise terahertz (THz) radiation over 100 MV/cm generation by a linearly-polarized relativistic laser pulse interacting with a near-critical-density (NCD) plasma slab is studied by theory and particle-in-cell (PIC) simulations. A theoretical model is established to examine the dipole-like radiation emission. The THz radiation is attributed to the single-cycle, low-frequency surface current which is longitudinally constrained by the quasi-equilibrium established by the laser ponderomotive force and the ponderomotively-induced electrostatic force. Through theoretical analysis, the spatiotemporal characteristics, polarization property of the THz radiation， and the relation between the radiation strength with the initial parameters of driving laser and plasma are obtained, which are in good consistence with the PIC simulation results. Furthermore, it is found by PIC simulations that the generation of thermal electrons can be suppressed within the appropriate parameter regime, resulting in a clear THz radiation waveform. The appropriate parameter region is given for generating a low-noise intense THz radiation with peak strength reaching 100 MV/cm, which could find potential applications in nonlinear THz physics.

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Spatiotemporal visualization of the terahertz emission during high-power laser-matter interaction

Cited by 9 publications

References 45 publications

Towards Terawatt-Scale Spectrally Tunable Terahertz Pulses via Relativistic Laser-Foil Interactions

Towards Terawatt-Scale Spectrally Tunable Terahertz Pulses via Relativistic Laser-Foil Interactions

Perspectives on ultraintense laser-driven terahertz radiation from plasmas

Intense low-noise terahertz generation by relativistic laser irradiating near-critical-density plasma

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