Effects of channel alternating corrugation on a laser beam propagation in plasmas |
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| Institution: | 1. Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People''s Republic of China;2. School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, People''s Republic of China;3. Graduate School, China Academy of Engineering Physics, Beijing 100088, People''s Republic of China |
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| Abstract: | The propagation of an intense laser beam in an alternating corrugated plasma channel, which has a wide region and a narrow region in one corrugated space period, is investigated. Compared with the usual corrugated plasma channel, it is found that there are many more resonance peaks and many more abundant beat-like wave phenomena for the laser beam in this extended channel. Moreover, the much narrower region in some special alternating corrugated channels can play the role like a plasma lens for some laser beams, i.e., it can obviously change the laser spot size from small (large) to large (small) amplitude when the laser passes through the narrow region. These results are well confirmed by the final numerical simulations of wave equation and particle-in-cell approach. |
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| Keywords: | Laser beam Corrugated plasma channel Resonance Beat-like wave Conversion Propagation characteristics |
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