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Coherently combined fiber laser system delivering 120 µJ femtosecond pulses

: Seise, E.; Klenke, A.; Breitkopf, S.; Plötner, M.; Limpert, J.; Tünnermann, A.


Optics Letters 36 (2011), No.4, pp.439-441
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

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%.