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Opt Lett. 2011 Feb 15;36(4):439-41. doi: 10.1364/OL.36.000439.

Coherently combined fiber laser system delivering 120 μJ femtosecond pulses.

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  • 1Institute of Applied Physics, Friedrich Schiller University Jena, Jena, Germany. enrico.seise@uni‑


We report on the coherent combination of two chirped pulsed fiber lasers. The beams coming from two 100 μm 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 μJ energy and a compressed duration of 800 fs were obtained. This, compared with the 66 μJ coming from each single amplifier, results in a combining efficiency as high as 91%.

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