A filter or oscillator by a simple density hump for an intense laser propagating in a preformed plasma channel

Zhang, Lei; Tang, Rong-An; Hong, Xue-Ren; Gao, Jun; Yin, L.; Tian, Junliang; Cheng, Rui-Jin; Xue, Ju-Kui

doi:10.1063/1.5055786

Cited by 3 publications

(1 citation statement)

References 56 publications

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“…The nonlinear interaction between an intense electromagnetic (EM) pulse and plasmas is of great interest in various fundamental research and technological applications, including harmonic generation, [1][2][3] self-focusing, [4][5][6] wakefield generation, [7,8] relativistic optical guiding, [9][10][11] x-ray, [12] laser pulse frequency shifting, [13] pulse compression, [14] relativistic EM soliton propagation. [15][16][17][18][19] Among spectacular phenomena in nonlinear interactions, relativistic EM solitary waves have attracted a great deal of attention in a fundamental point of view, also due to their possible applications in inertial confinement fusion and the charged particle acceleration.…”

Section: Introductionmentioning

confidence: 99%

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas*

Tang¹,

Liu²,

Hong³

et al. 2021

Chinese Phys. B

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By one-dimensional particle-in-cell (PIC) simulations, the propagation and stability of relativistic electromagnetic (EM) solitary waves as well as modulational instability of plane EM waves are studied in uniform cold electron-ion plasmas. The investigation not only confirms the solitary wave motion characteristics and modulational instability theory, but more importantly, gives the following findings. For a simulation with the plasma density 1023 m−3 and the dimensionless vector potential amplitude 0.18, it is found that the EM solitary wave can stably propagate when the carrier wave frequency is smaller than 3.83 times of the plasma frequency. While for the carrier wave frequency larger than that, it can excite a very weak Langmuir oscillation, which is an order of magnitude smaller than the transverse electron momentum and may in turn modulate the EM solitary wave and cause the modulational instability, so that the solitary wave begins to deform after a long enough distance propagation. The stable propagation distance before an obvious observation of instability increases (decreases) with the increase of the carrier wave frequency (vector potential amplitude). The study on the plane EM wave shows that a modulational instability may occur and its wavenumber is approximately equal to the modulational wavenumber by Langmuir oscillation and is independent of the carrier wave frequency and the vector potential amplitude. This reveals the role of the Langmuir oscillation excitation in the inducement of modulational instability and also proves the modulational instability of EM solitary wave.

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Section: Introductionmentioning

confidence: 99%

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas*

Tang¹,

Liu²,

Hong³

et al. 2021

Chinese Phys. B

Self Cite

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Propagation characteristics of a hollow Gaussian laser beam in a tapered plasma channel

et al. 2020

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The propagation characteristics of a hollow Gaussian laser beam (HGB) in a tapered plasma channel are studied by simultaneously considering the effects of relativistic self-focusing, ponderomotive self-channeling, and preformed channel focusing. A differential equation of the laser width parameter is derived by using the paraxial like approximation, and the critical surface that classifies the evolution behaviors of the HGB into focusing and defocusing is obtained theoretically. For verification, some numerical results are also given. It is found that the focusing ability of the HGB is proportional to the density of the tapered plasma channel, but it weakens with the increase in the order of the HGB. Furthermore, we also find that for the Gaussian laser beam, when the transverse plasma density is homogeneous, its focusing ability is stronger than that of the HGB with n = 3, while the trend just reverses when the transverse plasma density is parabolic.

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Propagation dynamics of an azimuthally polarized Bessel–Gauss laser beam in a parabolic plasma channel

et al. 2020

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The propagation dynamics of an azimuthally polarized dark hollow laser beam described by a first-order Bessel–Gauss laser beam in a parabolic plasma channel is investigated by adopting the weakly relativistic limit. By using the variational method, the evolution equation of the ring-beam radius is derived and the ring-beam width is proportional to and synchronous with the radius. It is found that the azimuthal polarization can weaken the vacuum diffraction effect and the propagation dynamics of the dark hollow laser beam may be classified into three types, i.e., propagation with a constant ring-beam radius and width, or synchronous periodic defocusing oscillation, or synchronous periodic focusing oscillation. Their corresponding critical conditions and characteristic quantities, such as the amplitudes and spatial wavelengths, are obtained. Further investigation indicates that, with the increase in the initial laser power or the ratio of initial ring-beam radius to channel radius, the dark hollow beam may experience a process from synchronous periodic defocusing oscillation to constant propagation and then to synchronous periodic focusing oscillation, in which the corresponding amplitudes decrease sharply to zero (constant propagation) and then increase gradually, while the spatial wavelength decreases continuously. The evolution type of this kind of dark hollow beam also depends on its initial amplitude but is insensitive to the initial laser profile which, however, has a large influence on the spatial wavelength. These results are well confirmed by the numerical simulation of the wave equation. A two-dimensional particle-in-cell simulation of an azimuthally polarized laser beam is performed finally and also reveals the main results.

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A filter or oscillator by a simple density hump for an intense laser propagating in a preformed plasma channel

Cited by 3 publications

References 56 publications

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas*

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas*

Propagation characteristics of a hollow Gaussian laser beam in a tapered plasma channel

Propagation dynamics of an azimuthally polarized Bessel–Gauss laser beam in a parabolic plasma channel

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