Journal
OPTICS EXPRESS
Volume 23, Issue 5, Pages 5406-5416Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.005406
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Funding
- Agence Nationale de la Recherche through the MultiFemto project [ANR 2011 BS09 028 01]
- French Ministry of Higher Education and Research
- Nord-Pas de Calais Regional Council
- FEDER through Contrat de Projets Etat Region (CPER)
- FEDER through Campus Intelligence Ambiante (CIA)
- FLUX Equipex Project (Programme Investissement d'Avenir)
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Active coherent beam combination using a 7-non-coupled core, polarization maintaining, air-clad, Yb-doped fiber is demonstrated as a monolithic and compact power-scaling concept for ultrafast fiber lasers. A microlens array matched to the multicore fiber and an active phase controller composed of a spatial light modulator applying a stochastic parallel gradient descent algorithm are utilized to perform coherent combining in the tiled aperture geometry. The mitigation of nonlinear effects at a pulse energy of 8.9 mu J and duration of 860 fs is experimentally verified at a repetition rate of 100 kHz. The experimental combining efficiency results in a far field central lobe carrying 49% of the total power, compared to an ideal value of 76%. This efficiency is primarily limited by group delay differences between cores which is identified as the main drawback of the system. Minimizing these group delay issues, e.g. by using short and straight rod-type multicore fibers, should allow a practical power scaling solution for femtosecond fiber systems. (C) 2015 Optical Society of America
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