光束成丝的非线性理论

文双春; 文双春; 范滇元; 范滇元

光学学报, 2001, 21 (12): 1458, 网络出版: 2006-08-10

光束成丝的非线性理论下载： 506次

Nonlinear Theory of Filamentation of Intense Laser Beams

论文大纲

文双春 ¹文双春 ²范滇元 ¹范滇元 ²

作者单位

¹ 高功率激光物理国家实验室,上海,201800

² 中国科学院上海光学精密机械研究所,上海,201800

小尺度自聚焦成丝 B积分非线性传输 small scale self focusing filamentation B integral nonlinear propagation

摘要

在考虑调制场和本底场之间有能量交换的情况下,研究了小尺度调制场的非线性演化过程.结果表明,受到小尺度调制的光束在传输过程中有可能经历周期性成丝过程.通过与Bespalov-Talanov (B-T)关于成丝的线性理论比较,发现B-T理论给出的最快增长频率和临界频率等结果在非线性演化过程中仍然是适用的,但其给出的调制增长率只在调制场的初始增长阶段与本文的非线性理论一致,此后,调制场的增长速度低于指数形式的增长速率,达到某个最大值后将经历周期性变化过程.

Abstract

Nonlinear evolution of filaments is investigated by taking into consideration of the energy exchange between background and modulational field. It is found that a modulated beam may experience a periodical filamentation. Bespalov Talanov (B T) theory gave the same results of the fastest growing frequency and the cutoff frequency as the nonlinear theory; but a different result of the fastest growth rate. Initially, the modulations grow exponentially, and afterwards, they grow slower than exponential.

参考文献

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文双春, 文双春, 范滇元, 范滇元. 光束成丝的非线性理论[J]. 光学学报, 2001, 21(12): 1458. 文双春, 文双春, 范滇元, 范滇元. Nonlinear Theory of Filamentation of Intense Laser Beams[J]. Acta Optica Sinica, 2001, 21(12): 1458.

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