中心主瓣尺寸可精细调控的类贝塞尔光束

Bessel-Like Beams with the Precisely Controllable Central Lobe Size

设计了一种相位函数,得到类贝塞尔光束中心主瓣尺寸随传播距离演化的解析公式,实现了类贝塞尔光束中心主瓣尺寸随轴向距离z的线性调控。通过实验,将所设计的相位函数加载到空间光调制器上,在直接空间中实现了类贝塞尔光束中心主瓣尺寸的精确调控,研究了不同传播长度下类贝塞尔光束中心主瓣尺寸的演化。实验结果与仿真结果一致,验证了该相位函数的可靠性,且在整个贝塞尔区间内,最高强度处的横向光强分布仍满足贝塞尔函数分布。

We design a phase function to precisely tune the central lobe size of the Bessel-like beams with the axial distance z.We further deduce the analytical formula of the central lobe size evolution with the propagation distance.Experimentally,we perform the precise control of the central lobe size in the direct space with our phase function loaded on the spatial light modulator.The measured evolutions of the Bessel-like beams with different lobe parameters agree well with the analytical and simulated results,which verifies the reliability of the phase function.Furthermore,the transverse intensity profiles at the longitudinal location of the peak intensity can be well fitted by the Bessel function.