蓝光LED产生局域空心光束  

Bottle Beam Generated by Blue LED

作　　者：李攀[1] 吴逢铁[1] 何西[1] 孙川[1] 

机构地区：[1]华侨大学信息科学与工程学院福建省光传输与变换重点实验室,福建厦门361021

出　　处：《激光与光电子学进展》2015年第4期193-198,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61178015);福建省科技创新平台计划项目(2012H2002);泉州市科技重点项目(2014Z127)

摘　　要：利用非相干蓝光LED和轴棱锥-透镜系统直接产生局域空心光束,证实了非相干光源通过轴棱锥-透镜系统可以得到局域空心光束。利用衍射理论和多波长叠加原理分析了具有一定频宽的部分相干光入射轴棱锥-透镜系统后的光场分布,并模拟了光束传输变换过程的三维光强分布及不同位置处的截面光强分布。实验采用蓝光LED结合轴棱锥-透镜系统产生局域空心光束,利用体视显微镜对不同位置处的光束截面光强分布进行记录。实验结果与理论分析相吻合,研究结果扩展了LED的应用,对粒子囚禁、原子冷却具有一定的指导和现实意义。A bottle beam is generated using an axicon-lens system and an incoherent blue LED source. It is demonstrated that the bottle beam can be obtained via an axicon-lens system illuminlated by an incoherent source. According to diffraction theory and the superposition of multi-wavelength, the intensity distribution of light field which is generated by a certain frequency bandwidth of partially coherent light propagating through an axicon-lens system is analyzed. The three-dimensional intensity distribution of the beam evolution and the transverse intensity distributions at different propagating distances are simulated. In the experiment, a blue LED source combined with an axicon-lens system is used to generate the bottle beam. The transverse intensity distribution of the bottle beam is recorded by a stereomicroscope. The experimental results are consistent well with the theoretical analysis, and the result shows a guidance and practical significance for particle trapping and atom cooling.

关 键 词：物理光学 LED光源 局域空心光束 轴棱锥 透镜 

分 类 号：O435.1[机械工程—光学工程]