高阶贝塞尔脉冲光束通过色散光阑透镜的传输特性

Propagation Properties of Higher-order Bessel Pulsed Beams Focused by a Dispersive Aperture Lens

研究了高阶贝塞尔脉冲光束通过色散光阑透镜的光谱和时间空间特性.结果表明:脉冲光束在几何焦面上会出现光谱开关,透镜色散使产生光谱开关的临界位置向z轴移动;透镜一阶色散使几何焦面上峰值光强减小,并使脉冲波形产生显著时间移动和展宽,而二阶和高阶色散的影响较小.此外,光束阶数n和空间参量α也会影响横向光强分布.

The spectral and spatiotemporal properties of higher-order Bessel pulsed beams focused by a dispersive aperture lens are studied. It is shown that the spectral switches take place at the geometrical focal plane,and the dispersion results in a shift of spectral switches towards the z-axis. The dispersion of the first order leads to a decrease of the peak intensity, to a noticeable shift and broadening of the pulse form,whereas the dispersion of the second and higher orders plays a relatively minor role. The beam order n and spatial parameter α additionally affect the transversal intensity distribution.