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laser light trapping in cavities

Laser and Particle Beams (1)

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Trapping of electromagnetic radiation in self-generated and preformed cavities
Shixia Luan, Wei Yu, Jingwei Wang, Mingyang Yu, Suming Weng, Masakatsu Murakami, Jingwei Wang, Han Xu, Hongbin Zhuo
Journal:

Laser and Particle Beams / Volume 31 / Issue 4 / December 2013

Published online by Cambridge University Press:

22 August 2013, pp. 589-595
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Laser light trapping in cavities in near-critical density plasmas is studied by two-dimensional particle-in-cell simulation. The laser ponderomotive force can create in the plasma a vacuum cavity bounded by a thin overcritical-density wall. The laser light is self-consistently trapped as a half-cycle electromagnetic wave in the form of an oscillon-caviton structure until it is slowly depleted through interaction with the cavity wall. When the near-critical density plasma contains a preformed cavity, laser light can become a standing wave in the latter. The trapped light is characterized as multi-peak structure. The overdense plasma wall around the self-generated and preformed cavities induced by the laser ponderomotive force is found to be crucial for pulse trapping. Once this wall forms, the trapped pulse can hardly penetrate.