Coherent beam combining of 61 femtosecond fiber amplifiers
Ihsan Fsaifes, Louis Daniault, Séverine Bellanger, Matthieu Veinhard, Jérôme Bourderionnet, Christian Larat, É. Lallier, Éric Durand, A. Brignon, Jean-Christophe Chanteloup
Abstract
We report on the coherent beam combining of 61 femtosecond fiber chirped-pulse amplifiers in a tiled-aperture configuration along with an interferometric phase measurement technique. Relying on coherent beam recombination in the far field, this technique appears suitable for the combination of a large number of fiber amplifiers. The 61 output beams are stacked in a hexagonal arrangement and collimated through a high fill factor hexagonal micro-lens array. The residual phase error between two fibers is as low as λ/90 RMS, while a combining efficiency of ∼50% is achieved.
Topics & Concepts
OpticsFemtosecondCollimated lightAmplifierMaterials scienceBeam (structure)Fiber laserInterferometryPhase (matter)Lens (geology)Fiber amplifierOptical fiberLaserOptoelectronicsPhysicsQuantum mechanicsCMOSLaser-Matter Interactions and ApplicationsLaser-Plasma Interactions and DiagnosticsAdvanced Fiber Laser Technologies