Abstract

We report on the coherent combination of two chirped pulsed fiber lasers. The beams coming from two 100μm 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 120μJ energy and a compressed duration of 800fs were obtained. This, compared with the 66μJ coming from each single amplifier, results in a combining efficiency as high as 91%.

© 2011 Optical Society of America

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