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利用光纤产生涡旋光对提高轨道角动量通信系统的性能、降低轨道角动量通信系统的成本等方面有重要的应用价值。少模光纤是一种只存在基模和低阶模式的光纤,结合光纤中的耦合模理论和涡旋光的产生原理,仿真分析了入射角度对少模光纤中一阶模式激发效率的影响,实验在少模光纤中产生了一阶模式TM01、TE01和HEeven21,并将一阶矢量光束HEeven21与HEodd21模式叠加产生涡旋光。偏振检测和三角形衍射实验表明,少模光纤产生的涡旋光是圆偏振光,拓扑荷数l=1。利用少模光纤可为实验中涡旋光的产生提供一种简单、低成本的方法。
The use of optical fiber to generate vortex light has an important application value in improving the performance of orbit angular momentum communication system and reducing the cost of orbit angular momentum communication system. The effect of incident angle on the first-order mode excitation efficiency in a mode-less optical fiber is simulated and analyzed based on the coupled mode theory and the principle of vortex light generation in the optical fiber. The experiment The first-order modes TM01, TE01 and HEeven21 are generated in the low-mode fiber, and the first-order vector beam HEeven21 is superposed with the HEodd21 mode to generate the vortex light. Polarization detection and triangular diffraction experiments show that the vortex light generated by the small mode fiber is circularly polarized light, the topological charge number l = 1. The use of less modeled fibers provides a simple, low cost method for the generation of vortex light in the experiment.