摘要
携带轨道角动量(OAM)的分数阶涡旋光束是一种特殊螺旋结构的光束。利用空间光调制器加载传输方向与z轴夹角α干涉光栅,制备出了分数阶涡旋光束;利用水平与垂直叠加光栅,制备出具有不同拓扑荷数的光斑阵列。通过对比多组叠加实验图样,分析了不同拓扑荷数叠加涡旋光束轨道角动量序列的规律,发现分数阶涡旋光束作为载体加载信息时,较整数阶涡旋光束有更强的光强分布,其中不同分数阶涡旋光束阵列的轨道角动量序列传递信息效率较高,有利于信息的传输,为涡旋光束在自由空间通信中的复用提供了实验依据。
Fractional vortex that carrys the orbital angular momentum is a kind of special vortex with spiral structure. Grating interference, which is made by vortex beams and the plane wave of the angle a with z axis, is used to make fractional vortex through spatial light modulator. Horizontal and vertical superposition grating is used to make the vortex arrays with different topological charge numbers. Through comparing the superposition of multiple sets of experimental design, the topological charge number vortex beam under the different topological superpositions is analyzed. It is found that, as a carrier, the loading information fractional vortex beam is stronger than the integer vortex beam intensity, in which different fractional numbers, the maximum number of types of the transmission of information provides the experimental basis for the reuse of vortex beam in free space communication.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第8期82-88,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61377080
60977054)
陕西省13115科技统筹计划(2011KTCQ01-31)
陕西省教育厅产业化培育基金(2010JC17)
西安市科技成果转换基金(CX12165)
陕西省自然科学基金研究计划(2013JQ8011)
陕西省教育厅科研计划项目(2013JK1104)
陕西省工业攻关科技计划项目(2013K06-08)
关键词
衍射
分数阶涡旋光束
叉形全息光栅
轨道角动量
测量
diffraction
fractional vortex
forked holography gratings
orbital angular momentum
measurement
