Reshaping of intense laser pulse with a capillary

Reshaping of intense laser pulse with a capillary
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用毛细管重塑强激光脉冲

DOI:
10.1063/1.3224903
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发表时间:
2009-09
期刊:
影响因子:
2.2
通讯作者:
He, X. T.
He, X. T.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Cao, Lihua;Yu, Wei;Yu, M. Y.;Wang, Xin;Gu, Yuqiu;He, X. T.

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采用粒子模拟方法研究了真空毛细管对强激光脉冲的整形。结果表明,当强激光脉冲从自由空间进入毛细管时,由于毛细管入口附近的激光与等离子体相互作用,其轮廓被重新整形。结果,自由空间模式自洽地转换成毛细管模式。只有相对低强度的整形脉冲的外围与毛细管壁等离子体相互作用,使得脉冲的高强度中心可以在窄真空通道中传播远大于瑞利长度的距离。然后,该机制被应用于整形的径向不完美的激光脉冲具有两个翅膀周围的中心点。大部分输出光能量集中在中心光斑,并且机翼几乎完全被去除。也就是说,激光脉冲的质量可以通过毛细管大大提高。
The reshaping of intense laser pulse by vacuum capillary is studied by particle-in-cell simulation. It is shown that as an intense laser pulse propagates from free space into a capillary, its profile is reshaped due to laser-plasma interaction near the entrance of capillary. As a result, the free-space mode is self-consistently converted into a capillary mode. Only the relatively low-intensity periphery of the reshaped pulse interacts with the capillary-wall plasma, so that the high-intensity center of the pulse can propagate in the narrow vacuum channel over a distance much larger than the Rayleigh length. The mechanism is then applied to reshape a radially imperfect laser pulse having two wings around the center spot. Most of the output light energy is concentrated in the center spot, and the wings are almost completely removed. That is, the quality of the laser pulse can be greatly improved by a capillary.
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