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arXiv 1707.03040physics.optics
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超短紧聚焦径向极化laser脉冲在线性响应等离子体中的场

Fields of an ultrashort tightly focused radially polarized laser pulse in a linear response plasma

Yousef I. Salamin

摘要:

本文导出并讨论了径向偏振、超短、紧聚焦激光脉冲在线性响应等离子体中传播的场的解析表达式。这些场是通过求解等离子体背景中由洛伦兹规范连接的矢量势和标量势的非均匀波动方程得到的。首先利用规范条件消去标量势,然后由波数初始均匀分布的傅里叶分量合成矢量势,并在截断级数(有限和)中逐项进行傅里叶逆变换。零阶项,例如,轴向电场分量示出的模型的脉冲比其广泛使用的傍轴近似对应。一些领域的传播特性进行了讨论,所有领域都显示出明显的预期在真空中传播的限制。

英文摘要:

Analytic expressions for the fields of a radially polarized, ultrashort and tightly focused laser pulse propagating in a linear-response plasma are derived and discussed. The fields are obtained from solving the inhomogenous wave equations for the vector and scalar potentials, linked by the Lorenz gauge, in a plasma background. First the scalar potential is eliminated using the gauge condition, then the vector potential is synthesized from Fourier components of an initial uniform distribution of wavenumbers, and the inverse Fourier transformation is carried out term-by-term in a truncated series (finite sum). The zeroth-order term in, for example, the axial electric field component is shown to model a pulse much better than its widely used paraxial approximation counterpart. Some of the propagation characteristics of the fields are discussed and all fields are shown to have manifestly the expected limits for propagation in a vacuum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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