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

Hu, Ke; Yi, Longqing

doi:10.1103/physreva.102.023530

Cited by 8 publications

(6 citation statements)

References 39 publications

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“…To our best knowledge, such half-cycle type (quasi-half-cycle) pulses generated in laser-target interactions were discussed only in numerical simulations or proposed as ad hoc a guess [12,13], while quasi-half-cycle pulses have already been observed in the experiments with electron beams from conventional accelerators [14]. Standardly, theory of transition radiation from electron bunch is presented in the far-field approximation [15][16][17][18] as extension of classical theory for a single electron [19]. There is no corresponding near-field theory, which could be a base for the experimental measurements THz fields near the target surface, where these fields have maximum strength.…”

Section: Introductionmentioning

confidence: 99%

“…A sheath plasma expansion model has been developed to describe THz radiation of ∼ 1 THz frequency in the direction perpendicular to the laser pulse propagation direction [1,2,25,26]. Transition radiation of laser heated electrons leaving the target is considered as another typical mechanism of THz generation [15][16][17][18]. For the highly relativistic electron beam this mechanism generates well collimated THz pulses along electron propagation direction.…”

Section: Introductionmentioning

confidence: 99%

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Powerful laser-produced quasi-half-cycle THz pulses

Kuratov,

Brantov,

Kovalev

et al. 2022

Preprint

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The Maxwell equations based 3D analytical solution for the terahertz half-cycle electromagnetic wave transition radiation pulse has been found. This solution describes generation and propagation of transition radiation into free space from laser-produced relativistic electron bunch crossing a target-vacuum interface as a result of ultrashort laser pulse interaction with a thin high-conductivity target. The analytical solution found complements the theory of laser initiated transition radiation by describing the generated THz wave shape at the arbitrary distance from the generating target surface domain including near-field zone rather than the standard far-field characterization. The analytical research has also been supplemented with the 3D simulations using the finite-difference time-domain (FDTD) method, which makes it possible for description of much wider spatial domain as compared to that from the particle-in-cell (PIC) approach. The results reported fundamentally shed light on the interfere of an electron bunch field and THz field of broadband transition radiation from laser-plasma interaction studied for a long time in the experiments with solid density plasma and may in future inspire them to targeted measurements and investigations of unique super intense half-cycle THz radiation waves near the laser target.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Powerful laser-produced quasi-half-cycle THz pulses

Kuratov,

Brantov,

Kovalev

et al. 2022

Preprint

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“…In order to acquire high-quality electron beams and highenergy THz radiation, schemes utilizing micro-structured targets have been proposed. 3D PIC simulations demonstrate strong electron emission at the micro-scaled target edge, which leads to a THz energy of over 10 mJ with a 1 J pump laser [19]. Another study employs solid foil targets covered with aligned nanorod arrays in experiments; the resulting efficiency is enhanced by an order of magnitude compared to a solid foil target [20].…”

Section: Introductionmentioning

confidence: 99%

Multimillijoule terahertz radiation from laser interactions with microplasma waveguides

Fülöp

2021

Plasma Phys. Control. Fusion

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When a relativistic, femtosecond laser pulse enters a waveguide, the pulse energy is coupled into waveguide optical modes. The longitudinal laser field effectively accelerates electrons along the axis of the channel, while the asymmetric transverse electromagnetic fields tend to expel fast electrons radially outwards. At the exit of the waveguide, the ∼nC, ∼10 MeV electron bunch converts its energy to a ∼10 mJ terahertz (THz) laser pulse through coherent diffraction radiation. In this paper, we present 3D particle-in-cell simulations and theoretical analyses of the aforementioned interaction process. We investigate the process of longitudinal acceleration and radial expulsion of fast electrons, as well as the dependence of the properties of the resulting THz radiation on laser and plasma parameters and the effects of the preplasma. The simulation results indicate that the conversion efficiency of energy can be over 5% if the waveguide length is optimal and a high contrast pump laser is used. These results guide the design of more intense and powerful THz sources.

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“…Frequency up-or downconversion of electromagnetic radiation can be realized through nonlinear wavematter and wave-wave interaction. THz radiation can also be produced in intense laser interaction with matter [3,5,[6][7][8][9][10][11][12][13][14]. T-rays can also be produced by the oscillating electrons in laser-induced wakefields [15][16][17], Smith-Purcell effect of the electron beams in laser-matter interactions [18], two-color laser gas-plasma interaction [19,20], transition-Cherenkov effect from laser filaments [21], laser-driven wire-guided helical undulators [22], and linear and nonlinear mode conversion [23], as well as laser interaction with strongly magnetized plasmas [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Radiation from a Plasma Cylinder with External Radial Electric and Axial Magnetic Fields

Cao

et al. 2021

Laser Part. Beams

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Terahertz (THz) radiation from a plasma cylinder with embedded radial electric and axial magnetic fields is investigated. The plasma density and the electric and magnetic fields are such that the electron plasma frequency is near the electron cyclotron frequency and in the THz regime. Two-dimensional particle-in-cell simulations show that the plasma electrons oscillate not only in the azimuthal direction but also in the radial direction. Spectral analysis shows that the resulting oscillating current pattern has a clearly defined characteristic frequency near the electron cyclotron frequency, suggesting resonance between the cyclotron and plasma oscillations. The resulting far-field THz radiation in the axial direction is also discussed.

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

Cited by 8 publications

References 39 publications

Powerful laser-produced quasi-half-cycle THz pulses

Powerful laser-produced quasi-half-cycle THz pulses

Multimillijoule terahertz radiation from laser interactions with microplasma waveguides

Terahertz Radiation from a Plasma Cylinder with External Radial Electric and Axial Magnetic Fields

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