由光纤激光器阵列合成的方位偏振光的相位控制

E. Adamov, V. Aksenov, V. V. Dudorov, V. V. Kolosov, M. E. Levitskii
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引用次数: 3

摘要

对分布偏振光束的控制为从光通信到材料激光加工的广泛应用开辟了新的途径。本文提出了一种简单有效的控制由空间有序光纤激光器发射的高斯光束相干组合而成的方位偏振光束空间特性的方法。该方法通过在有源反馈环路中放置相位形成元件液晶空间光调制器来保持阵列子波束之间指定的相位关系。该方法的一个显著特点是可以完全控制具有分布极化的光束,并且只对电场的一个分量进行相位控制。这使得实验的设计大大简化。讨论了空间分布偏振光束形成的数学模型和相位控制算法。实验证明了空间分布偏振光束的产生,包括圆柱矢量光束(CVB)和光学涡旋光束(OVB)。6台光纤激光器阵列的实验结果与数值模拟结果吻合较好。
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Phase control of an azimuthally polarized beam synthesized by an array of fiber lasers
The control over beams with distributed polarization opens new ways for a wide range of applications from optical communications to laser processing of materials. This paper proposes a simple and efficient method of controlling the spatial characteristics of azimuthally polarized beams synthesized as a result of coherent combining of Gaussian beams emitted by a spatially ordered array of fiber lasers. The proposed method is based on maintaining the specified phase relations between the array subbeams by placing a phase forming element - a liquid crystal spatial light modulator - in the active feedback loop. A distinctive feature of the proposed method is the possibility of full control over beams with distributed polarization with phase control of only one component of the electric field. This leads to the significantly simpler design of the experiment. The mathematical model of beam formation and the algorithm of phase control of beams with spatially distributed polarization are discussed. The generation of beams with spatially distributed polarization, including cylindrical vector beams (CVB) and optical vortex beams (OVB), is demonstrated experimentally. The results of the experiment with an array of six fiber lasers are in a good agreement with the results of numerical simulation.
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