Coherent Beam Combining of Three Watt-Level Fiber Amplifiers Using a DSP-Based Stochastic Parallel Gradient Descent Algorithm

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（4）
• 页码范围: 102-104
• 页数: 3页
• 语种: 英文

摘要

We present an experimental study on coherent beam combining of three watt-level fiber amplifiers using a stochas-tic parallel gradient descent (SPGD) algorithm. Phase controlling is performed by running the SPGD algorithm on a digital-signal-processor (DSP) chip with a voltage updating rate of 16500 times per second. Energy encircled in the target pinhole is 2.62 times more than that in an open loop. The combining efficiency is as high as 87%.