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1 November 2024 Demonstration of coherent beam combination with a novel control algorithm
Patrick J. Foley, Ian J. Thomson, M.J. Daniel Esser, Adam C. Fleming
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Proceedings Volume PC13201, High-Power Lasers and Technologies for Optical Countermeasures II; PC1320107 (2024) https://doi.org/10.1117/12.3031628
Event: Security + Defence, 2024, Edinburgh, United Kingdom
Abstract
Coherent Beam Combination (CBC) is a technique used to overcome the brightness limits of single laser sources by combining multiple sources into a single beam. The work presented here shows the development of an efficient CBC system with the capability for future power scaling. To ensure efficient CBC, a mutual phase relationship must be maintained between each beam. This is achieved through robust phase control algorithms. Two algorithms are considered in this work: the first is a conventional hill-climbing algorithm, while the second is a novel neural network. This new technique has shown higher resistance to noise than the hill-climbing based algorithm, as well as an order of magnitude decrease in time to reach full brightness. Innovative phase control was achieved using fast electro-optic modulators. The neural networks were deployed onto a microcontroller to prove the concept, before moving to a robust, power scalable and high-speed FPGA control system.
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Patrick J. Foley, Ian J. Thomson, M.J. Daniel Esser, and Adam C. Fleming "Demonstration of coherent beam combination with a novel control algorithm", Proc. SPIE PC13201, High-Power Lasers and Technologies for Optical Countermeasures II, PC1320107 (1 November 2024); https://doi.org/10.1117/12.3031628
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KEYWORDS
Coherent beam combination
Diffraction limit
Evolutionary algorithms
Neural networks
Diffraction
Electrooptic modulators
Field programmable gate arrays
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