Skip to Main content Skip to Navigation
Journal articles

Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Abstract : 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 μJ 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.
Document type :
Journal articles
Complete list of metadata

Cited literature [22 references]  Display  Hide  Download
Contributor : Marc Hanna Connect in order to contact the contributor
Submitted on : Friday, June 19, 2015 - 1:39:00 PM
Last modification on : Saturday, June 25, 2022 - 10:16:42 PM
Long-term archiving on: : Tuesday, September 15, 2015 - 7:31:26 PM


Files produced by the author(s)



Patricia Ramirez, Marc Hanna, Géraud Bouwmans, Hicham El Hamzaoui, Mohamed Bouazaoui, et al.. Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier. Optics Express, Optical Society of America - OSA Publishing, 2015, 23 (5), pp.5406-5416. ⟨10.1364/OE.23.005406⟩. ⟨hal-01120367⟩



Record views


Files downloads