Bessel光束纵向振幅特性及参量的影响

Properties of Apertured Bessel Beams and Influence of Parameters

利用数值计算从光场振幅的角度研究了 Bessel光束的纵向性质 ,发现 Bessel光束在自由空间中的传播可以理解为我们称之为 Bessel调制光场对另一个振幅为 1的平面波的调制 .又进一步研究了参数对其纵向特性的影响 ,发现 Bessel光束衰减速度 ,决定于β大小 ,而对于振荡性 R起主要作用 ,只有当 β→ 0和 R→∞同时被满足时 ,才能实现理想无衍射光束 .

The propagation features of Bessel beams are numerically calculated.We find that it can be gained by thinking of them as a plane wave modulated by another field which we called Bessel modulation field.And then we calculated the influence of parameter,find that the behavior of decline is determined by the parameter β but the behavior of oscillation is mainly determined by the parameter R.We draw the conclusion that only with both β→0 and R→∞ the ideal Bessel beam can exist.