摘要
对平面波经过轴棱锥——透镜系统的整个演绎过程进行详细的理论分析,数值模拟和实验验证。平面波经过轴棱锥产生横向光场不变的近似无衍射光,在最大无衍射距离内加入合适透镜将产生局域空心光束(Bottlebeam),而空心光束的尺寸可通过改变透镜焦距进行控制。当光束继续传播,贝塞尔(Bessel)光发生自重建(Self-reconstruction),但重建的Bessel光将会发散,光强随着传播距离增大而迅速下降,且中心亮斑尺寸也迅速增大。通过引入另一聚焦透镜对光束进行修正,恢复了Bessel光束的无衍射的特性。利用显微镜-CCD光束分析系统获得不同传播距离的截面光强分布,实验结果和理论分析及数值模拟相吻合。
A complete picture of the evolution of a plane wave passing through axicon-lens system was theoretical analyzed, numerical simulated and experimental demonstrated. A non-diffracting beam was obtained as plane wave passing axicon. A bottle beam can be generated if a focal lens kept within the maximum non-diffracting distance, and the size of the bottle beam easy adjusted by changing the focal length of the lens. As the beam further propagation, self-reconstruction of the Bessel beam generated. The divergence of the self-reconstruction beam causes the beam intensity decreasing and the bright spot size increasing as the beam propagating. A second focal lens was introduced to rectify the divergence of the self-reconstruction beam. The intensity profiles of the beam cross-section were captured using the optical system of the microscope and CCD camera. The theoretical analysis and numerical simulation were confirmed by the experimental results.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第9期2557-2560,共4页
Acta Optica Sinica
基金
国家自然科学基金(60477041)
福建省科学基金计划(A0710011)资助课题
关键词
光束传输
无衍射光
局域空心光束
自重建
beam propagation
non-diffracting beam
bottle beam
self-reconstruction
