Coherently combined fiber laser system delivering 120 μJ femtosecond pulses

Abstract

We report on the coherent combination of two chirped pulsed fiber lasers. The beams coming from two $100\mathrm{\mu m}$ core diameter ytterbium-doped rod-type fibers were coupled in a Mach-Zehnder-type interferometer by means of a polarization beam splitter. Active stabilization of the interferometer was achieved by using a piezo-mounted mirror driven by a Hänsch-Couillaud polarization detection system. Pulses with $120\mathrm{\mu J}$ energy and a compressed duration of $800\mathrm{fs}$ were obtained. This, compared with the $66\mathrm{\mu J}$ coming from each single amplifier, results in a combining efficiency as high as 91%.

© 2011 Optical Society of America

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