Details

Autor(en) / Beteiligte

• Jolivet, V.
• Bourdon, Pierre
• Bennai, Baya
• Lombard, Laurent
• Goular, Didier
• Pourtal, Emilie
• Canat, Guillaume
• Jaouen, Yves
• Moreau, Bernard
• Vasseur, Olivier

Titel

Beam Shaping of Single-Mode and Multimode Fiber Amplifier Arrays for Propagation Through Atmospheric Turbulence

Ist Teil von

• IEEE journal of selected topics in quantum electronics, 2009-03, Vol.15 (2), p.257-268

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2009

Quelle

IEL

Beschreibungen/Notizen

• We report experimental results and theoretical analysis of coherent beam combining with active phase control fiber beam shaping. An original optical configuration for target-in-the-loop single-mode fiber amplifier coherent combining through turbulence is presented, with a lambda/15 residual phase error. The experimental results and theoretical analysis demonstrate that detection subsystem aperture reduction is paramount to lower sensitivity to backward turbulence when using a detector in the laser emitter plane. In this configuration, coherent combining is achieved on a remote scattering surface with sole compensation of the onward turbulence. We also present a numerical model capable of assessing the combining efficiency in the case of high-power multimode large-mode-area (LMA) fiber amplifiers. Preliminary theoretical investigations point out that multiple-transverse-mode combining can result in severe wavefront distortion. In the case of multimode LMA fibers, control of the transverse modes phase relationship has to be achieved to preserve combining efficiency.