Proceedings ArticleDOI
Implementation of stochastic parallel gradient descent algorithm for coherent beam combining
C.L. Linslal,M. S. Sooraj,A. Padmanabhan,Deepa Venkitesh,Balaji Srinivasan +4 more
- Vol. 10811, pp 1081115
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TLDR
This work demonstrates a fiber-optic Mach-Zehnder Interferometer with stabilized output using the SPGD algorithm implemented in a commercial controller board and investigates the implementation of the SP GD algorithm and study key performance factors such as convergence time and output signal noise.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.read more
Citations
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Journal ArticleDOI
Non-uniform adaptive angular spectrum method and its application to neural network assisted coherent beam combining
TL;DR: The paper proposes to use a Fully Connected Artificial Neural Network (FCANN) to correct the beam positioning perturbations by evaluating the beam shifts and tilts from two images taken at slightly different locations, demonstrating the viability of the proposed approach not only for coherent beam combing, but also in other beam alignment applications.
Proceedings ArticleDOI
Experimental validation of free-space coherent beam combining simulations for filled aperture configuration
TL;DR: In this paper, a theoretical model for filled aperture coherent beam combining has been developed and the simulation results are validated through coherent beam combination of two 100 W laser beams using a diffractive optical element.
Proceedings ArticleDOI
Investigation on the role of coherence in polarization beam combining of 2 x 100W fiber lasers
TL;DR: In this paper, the authors reported an investigation on the PBC of two laser beams through simulation and experimental studies, and showed that the combined beam intensity and its stability are not degraded significantly due to phase correlation between beams, which is validated through their experimental results.
References
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Journal ArticleDOI
High power fiber lasers: current status and future perspectives [Invited]
TL;DR: This paper reviews the current state of the art in terms of continuous-wave and pulsed performance of ytterbium-doped fiber lasers, the current fiber gain medium of choice, and by far the most developed in Terms of high-power performance.
Journal ArticleDOI
Coherent combining of a 4 kW, eight-element fiber amplifier array.
C.X. Yu,Steven J. Augst,Shawn M. Redmond,K C Goldizen,Daniel V. Murphy,Antonio Sanchez,T. Y. Fan +6 more
TL;DR: Commercial 0.5 kW Yb-doped fiber amplifiers have been characterized and found to be suitable for coherent beam combining and the beam-combining performance is independent of output power.
Journal ArticleDOI
Coherent beam combining and phase noise measurements of ytterbium fiber amplifiers.
TL;DR: Phase noise characterization of a 10-W Yb fiber amplifier is presented, and phase locking of two fiber amplifiers with near-perfect fringe contrast at power levels of as much as 10 W per fiber are demonstrated.
Journal ArticleDOI
First experimental demonstration of self-synchronous phase locking of an optical array
Thomas M. Shay,Vincent Benham,J. T. Baker,Benjamin G. Ward,Anthony D. Sanchez,Mark A. Culpepper,D. Pilkington,Justin B. Spring,Douglas J. Nelson,Chunte A. Lu +9 more
TL;DR: The first demonstration of the only electronic phase locking technique that doesn't require a reference beam is reported, and the measured phase error is lambda/20.
Journal ArticleDOI
Coherent Beam Combining of Fiber Amplifiers Using Stochastic Parallel Gradient Descent Algorithm and Its Application
TL;DR: In this paper, the authors present theoretical and experimental research on coherent beam combining of fiber amplifiers using stochastic parallel gradient descent (SPGD) algorithm and demonstrate the feasibility of beam combining using SPGD algorithm analytically.