摘要
从理论上对无衍射贝塞耳(Bessel)光束的光强分布进行描述,模拟了贝塞耳光束经过障碍物后,不同传播距离的二维光强分布。进行了贝塞耳光束二次重建的实验,测定了相关的参量。实验所用障碍物的大小分别为400μm,520μm时,其最小重建距离分别为44 mm,60 mm。这说明障碍物的尺寸越小越容易重建。理论与实验证实,在一定的条件下,被障碍物阻碍的贝塞耳光束在自由空间里可以重建并且可以多层面地重建,研究结果可用于多层面微粒的操控。
The intensity profile of the non-diffracting Bessel beams disturbed by an opaque obstacle was studied. The two dimonsional optical intensities distribution in difference propagation distances was simulated numerically. Second time reconstruction of the Bessel beam was demonstrated, and the relative parameters were measured. The minimum reconstruction distances are 44 mm and 60 mm respectively when the obstacle dimensions are 400 um and 520 um. It shows that the smaller the dimension of the obstacle is, the easier the beam reconstruction. The simulation and experimental results show that the obstructed Bessel beam can reconstruct itself in free space, even achieve muhi plane . This result has an important practical significance in muhi-plane micro-manipulation.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第2期379-382,共4页
Chinese Journal of Lasers
基金
国家自然科学基金(60477041)
福建省自然科学基金计划(A0710011
A0410017)资助项目
关键词
激光物理
无衍射叭寒耳光束
重建
轴棱锥
测微尺
laser physics
non- diffraction Bessel beams
self reconstruction
axicon
mini-ruler
