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5 November 2018 Implementation of stochastic parallel gradient descent algorithm for coherent beam combining
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Abstract
Coherent beam combining of multiple laser beams is an attractive approach for scaling up the output power from fiber laser sources while maintaining their beam quality. A key challenge in such a beam combining approach is the need for active phase synchronization between the different amplifier arms. Stochastic parallel gradient descent (SPGD) algorithm is a popular method for synchronizing the phase across a large number of sources as it has a relatively simple hardware requirement and is scalable. In this work, we demonstrate a fiber-optic Mach-Zehnder Interferometer (MZI) with stabilized output using the SPGD algorithm implemented in a commercial controller board. We investigate the implementation of the SPGD algorithm and study key performance factors such as convergence time and output signal noise.
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Linslal C. L., Sooraj M. S., Padmanabhan A., D. Venkitesh, and B. Srinivasan "Implementation of stochastic parallel gradient descent algorithm for coherent beam combining", Proc. SPIE 10811, High-Power Lasers and Applications IX, 1081115 (5 November 2018); https://doi.org/10.1117/12.2501014
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