Implementation of stochastic parallel gradient descent algorithm for coherent beam combining

Linslal C. L.; Sooraj M. S.; Padmanabhan A.; D. Venkitesh; B. Srinivasan

doi:10.1117/12.2501014

5 November 2018 Implementation of stochastic parallel gradient descent algorithm for coherent beam combining

Linslal C. L., Sooraj M. S., Padmanabhan A., D. Venkitesh, B. Srinivasan

Proceedings Volume 10811, High-Power Lasers and Applications IX; 1081115 (2018) https://doi.org/10.1117/12.2501014
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

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.

Citation Download Citation

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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