Opt Lett. 2013 Aug 15;38(16):3151-3. doi: 10.1364/OL.38.003151.
We report on a novel type of optical mode conversion in fiber acousto-optics. The all-fiber narrowband complete transformation of the fundamental mode into the frequency downshifted optical vortex beam of topological charge +1 or -1 via a lowest-order flexural acoustic wave is theoretically demonstrated. Moreover, such a process is found to be polarization dependent: both the topological charge and polarization state of the produced optical vortex are governed by the circular polarization handedness of the input mode. The possible applications of the established conversion for optical vortex manipulation are discussed.
我们报告了光纤声光中的一种新型光模式转换。通过最低阶弯曲声波，理论上证明了基模到拓扑电荷为+1 或-1 的频移光涡旋光束的全光纤窄带完全转换。此外，发现该过程具有偏振依赖性：产生的光涡旋的拓扑电荷和偏振状态均由输入模式的圆偏振手性控制。讨论了所建立的转换在光涡旋操纵中的可能应用。
