携带轨道角动量的扭曲激光在磁化等离子体中的传播

Subhajit Bhaskar, Hitendra K. Malik
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引用次数: 0

摘要

研究了携带轨道角动量 l 的电磁束在轴向施加静磁场的冷无碰撞等离子体中的传播。相对论非线性和思索非线性同时被考虑在内。利用 Wentzel-Kramers-Brillouin 方法和缓慢变化的包络近似推导出了静态非线性薛定谔方程。自俘获模式的临界条件是轨道角动量(OAM)、磁场和光束初始激光强度的函数。比较了介质对两种偏振(即左圆偏振(LCP)和右圆偏振(RCP))的响应,观察到 RCP 激光器比 LCP 激光器显示出更好的聚焦效果,而且实现自俘获模式所需的光束半径也更小。此外,还研究了外加磁场和激光器 OAM 对光束宽度演变的影响。结果发现,在外加磁场较大的情况下,激光会更早聚焦。观察到具有较高 OAM 的 Laguerre-Gaussian 激光器显示出高效的自聚焦。这项研究有助于在粒子加速、电子束生成、X 射线源等领域进行探索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Propagation of twisted laser carrying orbital angular momentum in magnetized plasma
The propagation of electromagnetic beams carrying orbital angular momentum l is investigated in a cold collisionless plasma where a static magnetic field is applied in the axial direction. The relativistic and ponderomotive nonlinearities are taken into consideration simultaneously. A stationary nonlinear Schrödinger equation is derived using the Wentzel–Kramers–Brillouin method and the slowly varying envelope approximation. The critical condition for the self-trapped mode is achieved as a function of orbital angular momentum (OAM), magnetic field, and initial laser intensity of the beam. The response of the medium to the two types of polarizations, i.e., left circular polarization (LCP) and right circular polarization (RCP), is compared, and it is observed that the RCP laser shows better focusing than the LCP laser and also requires a smaller beam radius for achieving the self-trapped mode. The effect of applied magnetic field and OAM of the laser is also studied on the beam width evolution. The laser is found to be focused earlier in the cases of a larger applied magnetic field. A Laguerre–Gaussian laser with higher OAM is observed to show efficient self-focusing. This study enables exploration in the fields of particle acceleration, electron bunch generation, x-ray sources, and more.
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