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Challenges in coherent beam combining of high power fiber amplifiers: a review

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Abstract

Coherent combining of light from multiple high power fiber amplifiers is a promising pathway to scaling the output power to hundreds of kiloWatts. In the last decade, substantial progress has been made in terms of scaling number of elements along with improvement in phase control techniques to achieve stable locking, resulting in tens of kiloWatts of output power. In this paper, we review the progress in coherent beam combining of fiber amplifiers in the master oscillator power amplifier configuration. We also discuss the challenges in power scaling as well as the current trends in the corresponding mitigation strategies. Specifically, the use of optimized phase modulation waveforms for mitigation of stimulated Brillouin scattering in high power amplifiers, scaling of the number of beam combining elements through deep-learning based phase control, and the use of micro-lens array for enhancing beam combination efficiency are discussed.

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Acknowledgements

The authors would like to acknowledge funding support by DRDO Laser Science & Technology Centre (LASTEC) and Centre for High Energy Systems & Sciences (CHESS) through Contract for Acquisition of Research Services (CARS) projects, and MHRD/DRDO, Government of India through the Impacting Research Innovation and Technology scheme (IMPRINT/5375), as well as technical discussions with Drs. Anup Shah and Jagannath Nayak. The authors are thankful to Prof. Johan Nilsson and Dr. Yusuf Panbiharwala for the technical discussions.

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  1. Awakash Dixit

    Present address: Joint Advanced Technology Centre, Indian Institute of Technology Delhi, New Delhi, Delhi, 110016, India

Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, 600036, Tamil Nadu, India

    Charles Lailabai Linslal, Padmanabhan Ayyaswamy, Satyajit Maji, Mundakkolly Sureshbabu Sooraj, Awakash Dixit, Deepa Venkitesh & Balaji Srinivasan

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  1. Charles Lailabai Linslal
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Linslal, C.L., Ayyaswamy, P., Maji, S. et al. Challenges in coherent beam combining of high power fiber amplifiers: a review. ISSS J Micro Smart Syst 11, 277–293 (2022). https://doi.org/10.1007/s41683-022-00099-4

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