
Proceedings Paper
Theoretical analysis and quantitative measurements of fiber amplifier coherent combining on a remote surface through turbulenceFormat | Member Price | Non-Member Price |
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Paper Abstract
Coherent beam combining of fiber amplifier arrays is an efficient way to overcome the physical limitations to fiber laser
power scaling. Moreover, coherent combining techniques involving active phase control of the laser emitters offer the
largest versatility, as they can also be used for complex purposes such as beam steering, wavefront shaping or
atmospheric turbulence compensation. We reported last year the first experimental demonstration of coherent combining
of fiber amplifiers on a remote scattering surface, after propagation through turbulent atmosphere, using the
backscattered signal. These results were achieved with a frequency-tagging technique, and appropriate spatial filtering to
lower sensitivity to backward turbulence, and compensate only for onward turbulent propagation. We present now
experimental measurements of turbulence strength and resulting residual phase error. With turbulence compensation
using the backscattered signal for phase control, this error is λ/15 rms. We also present the theoretical analysis of this
experiment, emphasizing how limiting the aperture and not the field of view of the phase difference measurement
subsystem reduces sensitivity to backward turbulence, without decreasing the optical flux on the detector.
Paper Details
Date Published: 19 February 2009
PDF: 8 pages
Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 719527 (19 February 2009); doi: 10.1117/12.808246
Published in SPIE Proceedings Vol. 7195:
Fiber Lasers VI: Technology, Systems, and Applications
Denis V. Gapontsev; Dahv A. Kliner; Jay W. Dawson; Kanishka Tankala, Editor(s)
PDF: 8 pages
Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 719527 (19 February 2009); doi: 10.1117/12.808246
Show Author Affiliations
Pierre Bourdon, ONERA (France)
Veronique Jolivet, ONERA (France)
Baya Bennai, ONERA (France)
Laurent Lombard, ONERA (France)
Veronique Jolivet, ONERA (France)
Baya Bennai, ONERA (France)
Laurent Lombard, ONERA (France)
Published in SPIE Proceedings Vol. 7195:
Fiber Lasers VI: Technology, Systems, and Applications
Denis V. Gapontsev; Dahv A. Kliner; Jay W. Dawson; Kanishka Tankala, Editor(s)
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