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通过相干合束提高光纤激光源的输出功率是目前研究的一个热门领域,其中多束激光的相位控制是提高合束效率的关键技术之一.本文基于主动相位锁定技术对传统外差探测法进行了改进,基于压电陶瓷及光纤电光相位调制器双通道伺服反馈,实现了对同一激光源输出的两路相位独立变化的1531 nm激光长时间的相位锁定.通过选择合适的PID控制参数,将反馈带宽拓展到了220 k Hz(受限于PID控制器自身带宽).最终的相位锁定控制在0.88?以内,即相位控制精度为λ/400,经过160 s平均后可得到相位锁定的最佳值为0.006?,整体实验装置结构简单、运行稳定.
It is one of the most popular fields to improve the output power of fiber laser source through coherent combining, in which the phase control of multi-beam laser is one of the key technologies to improve the efficiency of the combination.According to the active phase-locking technique, Based on the dual-channel servo feedback of piezoelectric ceramic and fiber electro-optic phase modulator, the phase locking of 1531 nm laser with two independent phases changed by the same laser source was achieved. By selecting suitable PID control parameters, The feedback bandwidth has been extended to 220 k Hz (limited by the bandwidth of the PID controller itself.) The final phase-locked control is within 0.88 μ, that is, the phase-controlled accuracy is λ / 400 and the best phase-locked value 0.006 ?, the overall experimental device structure is simple, stable operation.