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Coherent combination of two Tm-doped fiber amplifiers

: Gaida, C.; Kienel, M.; Mueller, M.; Klenke, A.; Gebhardt, M.; Stutzki, F.; Jauregui, C.; Limpert, Jens; Tünnermann, Andreas


Optics Letters 40 (2015), Nr.10, S.2301-2304
ISSN: 0146-9592
Fraunhofer IOF ()

The efficient coherent combination of two ultrafast Tm-doped fiber amplifiers in the 2-mu m wavelength region is demonstrated. The performance of the combined amplifiers is compared to the output characteristics of a single amplifier being limited by the onset of detrimental nonlinear effects. Nearly transform-limited pulses with 830-fs duration, 22-mu J pulse energy, and 25-MW peak power have been achieved with a combining efficiency greater than 90%. Based on this result, it can be expected that 2-mu m-ultrafast-fiber-laser systems will enter new performance realms in the near future.