【摘要】 利用数值计算研究了Bessel光束的纵向特性及参量对其的影响 ,发现在光强达到最大值IMAX 后 ,先迅速衰减但是并不趋于零 ,而后缓慢减小 ;光强的衰减速度 ,决定于 β的大小 ,而光强的振荡性同时与 β和R有关。只有当 β→ 0 和R→∞ 同时被满足时 ,才能实现理想无衍射光束。更多还原

【Abstract】 The propagation properties of Bessel beams and the influence of parameters β and R are numerically calculated. We find that after a sharp decline but not to zero, the axial intensity decreases very slowly,and the behavior of decline is determined only by the parameter β but the behavior of oscillation is determined by the parameters both R and β. Finally, we draw the conclusion that only with both β→0 and R→∞ the ideal nondiffracting beam can exist.更多还原