Coherent combining of 7 fiber lasers using a multi-plane light converter device

A. Limery; L. Lombard; P. Bourdon; A. Billaud; O. Pinel; G. Labroille; T. Le Guennic; P. Jian

doi:10.1117/12.2599923

12 September 2021 Coherent combining of 7 fiber lasers using a multi-plane light converter device

A. Limery, L. Lombard, P. Bourdon, A. Billaud, O. Pinel, G. Labroille, T. Le Guennic, P. Jian

Proceedings Volume 11867, Technologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V; 118670H (2021) https://doi.org/10.1117/12.2599923
Event: SPIE Security + Defence, 2021, Online Only

Abstract

An experimental demonstration of laser beam coherent combining with active phase control has been performed using for the first time a Multi-Plane Light Converter device (MPLC). The MPLC as a beam combiner is designed as a spatial multiplexer which output modes form a Gaussian beam when superimposed constructively, reaching theoretically 100% efficiency. Moreover, reflective free-space design allows for handling high power. The experiment combines seven 1.5 μm continuous wave fiber lasers operated at a low power level in the tens of milliwatt range using the frequencytagging LOCSET technique (Locking of Optical Coherence by Single-detector Electronic-frequency Tagging) for the phase locking. 72-% power efficiency MPLC CBC is achieved with an output combined beam close to a Gaussian beam profile. M² is lower than 1.8 depending on the transverse direction, revealing an excellent quality for the combined beam. The output beam is more than 94 % linearly polarized. Simulation of the impact of atmospheric turbulence on the propagation of the seven laser beams up to 1 km is performed. We demonstrate that it is possible to compensate for most of the atmospheric propagation detrimental effects and to perform efficient MPLC CBC through strong turbulence.

Conference Presentation

Citation Download Citation

A. Limery, L. Lombard, P. Bourdon, A. Billaud, O. Pinel, G. Labroille, T. Le Guennic, and P. Jian "Coherent combining of 7 fiber lasers using a multi-plane light converter device", Proc. SPIE 11867, Technologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V, 118670H (12 September 2021); https://doi.org/10.1117/12.2599923

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