| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Coherent Beam Combining of Three Watt-Level Fiber Amplifiers Using a DSP-Based Stochastic Parallel Gradient Descent Algorithm |
| ZHOU Pu, LIU Ze-Jin, WANG Xiao-Lin, MA Yan-Xing, LI Xiao, XU Xiao-Jun, GUO Shao-Feng |
| College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha 410073 |
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| Cite this article: |
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ZHOU Pu, LIU Ze-Jin, WANG Xiao-Lin et al 2009 Chin. Phys. Lett. 26 044202 |
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Abstract We present an experimental study on coherent beam combining of three watt-level fiber amplifiers using a stochastic 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%.
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| Keywords:
42.55.Wd
42.25.Kb
42.60.Da
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Received: 05 September 2008
Published: 25 March 2009
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