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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Dielectric constant and laser beam propagation in an underdense collisional plasma: Effects of electron temperature
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Dielectric constant and laser beam propagation in an underdense collisional plasma: Effects of electron temperature

机译：弱碰撞等离子体中的介电常数和激光束传播：电子温度的影响

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摘要

Dielectric constant and laser beam propagation in an underdense collisional plasma are investigated, using the wave and dielectric function equations, for their dependence on the electron temperature. Simulation results show that, due to the influence of the ponderomotive force there is a nonlinear variation of electron temperature in an underdense collisional plasma, and this leads to a complicated and interesting nonlinear variation of dielectric constant; this nonlinear variation of dielectric constant directly affects the beam propagation and gives rise to laser beam self-focusing in some spatial-temporal regions; in particular, the beam width and the beam intensity present an oscillatory variation in the self-focusing region. The influence of several parameters on the dielectric function and beam self-focusing is discussed.
机译：利用波和介电函数方程，研究了在低密度碰撞等离子体中的介电常数和激光束传播对电子温度的依赖性。仿真结果表明，由于磁动力的影响，在低密度碰撞等离子体中电子温度存在非线性变化，从而导致介电常数的复杂有趣的非线性变化。介电常数的这种非线性变化直接影响光束的传播，并在某些时空区域引起激光束的自动聚焦。特别地，光束宽度和光束强度在自聚焦区域中呈现出振荡变化。讨论了几个参数对介电函数和光束自聚焦的影响。

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