Jin Kaikai, Su Rongtao, Chang Hongxiang, Yang Yi, Jiang Min, Zhang Yuqiu, Ma Yanxing, Zhou Pu
Opt Express. 2024 Oct 7;32(21):36132-36140. doi: 10.1364/OE.537116.
With the superpositions of spin and orbital angular momentum, vectorial vortex beams (VVBs) have attracted great attention in recent years. Many approaches have been developed to generate such beams, but high-power output is not supported. Here, we report the coherent beam combining (CBC) for generating VVBs that are compatible with high-power fiber amplifiers. The laser array is composed of two discrete vortex arrays with left-handed and right-handed circular polarization states. The phase and polarization of each beamlet are manipulated simultaneously. Experimentally, the phase noise in the amplifiers is compensated by the all-fiber internal phase control feedback structure. Quarter-wave plates are employed as polarization state converters. When the system is in the closed loop, a distinct and stable VVB can be obtained in the far-field. This work could provide a significant reference for the future implementation of high-power structured beams.
随着自旋角动量和轨道角动量的叠加，矢量涡旋光束（VVBs）近年来备受关注。人们已经开发出许多方法来产生这种光束，但不支持高功率输出。在此，我们报道了用于产生与高功率光纤放大器兼容的VVBs的相干光束合成（CBC）。激光阵列由具有左旋和右旋圆偏振态的两个离散涡旋阵列组成。同时控制每个子光束的相位和偏振。实验上，放大器中的相位噪声通过全光纤内部相位控制反馈结构进行补偿。采用四分之一波片作为偏振态转换器。当系统处于闭环状态时，可在远场获得清晰稳定的VVB。这项工作可为未来高功率结构化光束的实现提供重要参考。
