摘要
研究了超短脉冲贝塞尔光束在色散介质中的传输特性 ,指出空间诱导色散效应可以用来补偿介质色散作用 ,从而可以在色散介质中实现无衍射无色散的类时空孤子波的传输。用理论推导和数值模拟的方法得到的具有反常色散性质的空间诱导色散可以有效地补偿介质色散。数值模拟的结果表明 ,由于超短脉冲贝塞尔光束的无衍射无色散传输距离受到高阶色散效应和贝塞尔光束空间受限两方面的限制 ,无衍射无色散传输只能在有限距离内近似实现。通过增加脉冲长度可以减小高阶色散效应的影响。在传输距离小于衍射距离时 。
The propagation characteristic of ultrashort pulsed Bessel light beam in dispersive medium is studied. The spatially induced group velocity dispersion (SIGVD) can be used to compensate the dispersion of medium. Diffraction free and quasi dispersion free pulsed beams, similar to a spatiotemproal soliton, can be produced in a dispersion medium. The numerical simulation results have confirmed the existence of this soliton like electromagnetic wave. After considering the finite aperture of Bessel beam and the high order dispersion, the diffraction free and dispersion free propagation can only be achieved in a finite distance. The effect of high order dispersions would become weaker if the longer light pulses are selected. Within the distance shorter than the diffraction distance, the SIGVD describes accurately the dispersive compensation and evolvement of the pulsed beam.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第7期916-921,共6页
Acta Optica Sinica
基金
国家自然科学基金 (6 0 2 780 13)
广东省自然科学基金团队项目(2 0 0 0 30 6 1)
教育部霍英东教育基金会 (810 5 8)
国家高技术研究发展计划惯性约束聚变领域专项经费(80 4 5 )部分资助课题
关键词
激光物理
脉冲光束
色散补偿
空间诱导色散效应
laser physics
pulsed light beam
dispersive compensation
spatially induced group velocity dispersion
