空间诱导群速度色散的数值研究

Numerical study of tie spatially induced group velocity dispersion

利用数值模拟方法研究了超短脉冲Bessel光束传输过程中的空间诱导群速度色散 .数值模拟的结果证实了对于实验中有限宽度的Bessel光束 ,只要其衍射距离大于空间诱导群速度色散的距离 ,空间诱导群速度色散的理论就可以很好地描述脉冲的演化过程 .

We have studied, by numerical simulations, the spatially induced group velocity dispersion in the propagation of ultrashort pulsed Bessel beams in free space. The simulation results have confirmed the existence of the spatially induced dispersions in the propagation of a truncated Bessel beam which can be constructed in practice. It is shown that the spatially induced dispersion is observed when the diffraction length of truncated Bessel beams is longer than the dispersion length of spatially induced group velocity dispersion.