Coherent beam combining of lasers: toward wavelength versatility and long-range operation compliance

Pierre Bourdon; Rodwane Chtouki; Laurent Lombard; Anasthase Liméry; Julien Le Goüet; François Gustave; Hermance Jacqmin; Didier Goular; Christophe Planchat; Anne Durécu

doi:10.1117/12.2656457

7 November 2022 Coherent beam combining of lasers: toward wavelength versatility and long-range operation compliance

Pierre Bourdon, Rodwane Chtouki, Laurent Lombard, Anasthase Liméry, Julien Le Goüet, François Gustave, Hermance Jacqmin, Didier Goular, Christophe Planchat, Anne Durécu

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Proceedings Volume 12347, XXIII International Symposium on High Power Laser Systems and Applications; 123470A (2022) https://doi.org/10.1117/12.2656457
Event: XXIII International Symposium on High Power Laser Systems and Applications, 2022, Prague, Czech Republic

Abstract

Coherent beam combining (CBC) by active phase control is an efficient technique to power scale fiber laser sources emitting in the near-infrared, between 1 and 2 μm, up to the multi-kilowatt level. Interestingly, it has been demonstrated by our team that CBC could also be used to power scale mid-infrared sources, frequency converters, generating a wavelength between 3 and 5 μm. We present our latest results on coherent combining of continuous-wave highefficiency mid-infrared sources: optical parametric oscillators (OPOs) and detail the difficulties encountered to achieve this combining, as well as the main limitations to efficient operation of CBC in this case. In a second part of this talk, we also present recent results on coherent combining of seven 1.5-μm fiber lasers through active phase control, using frequency-tagging, and operating efficiently on a remote target. A testbed has been designed to combine these 7 lasers on a remote surface, with phase-locking operating through analysis of the optical signal backscattered by the target, in a so-called target-in-the-loop (TIL) experiment. In such TIL configuration, CBC mitigates both laser-amplification-induced and atmospheric turbulence-induced phase fluctuations simultaneously. CBC demonstrated proper operation outdoors, on a target located up to 1 km from the laser and the results from this experimental campaign will be described.

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Pierre Bourdon, Rodwane Chtouki, Laurent Lombard, Anasthase Liméry, Julien Le Goüet, François Gustave, Hermance Jacqmin, Didier Goular, Christophe Planchat, and Anne Durécu "Coherent beam combining of lasers: toward wavelength versatility and long-range operation compliance", Proc. SPIE 12347, XXIII International Symposium on High Power Laser Systems and Applications, 123470A (7 November 2022); https://doi.org/10.1117/12.2656457

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KEYWORDS

Optical parametric oscillators

Fiber lasers

Crystals

Amplifiers

Feedback loops

Fiber amplifiers

Modulators

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