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Spectral beam combination of fiber amplified ns-pulses by means of interference filters

: Schmidt, O.; Wirth, C.; Nodop, D.; Limpert, J.; Schreiber, T.; Peschel, T.; Eberhardt, R.; Tünnermann, A.

Postprint (221 KByte; PDF; )

Optics Express 17 (2009), Nr.25, S.22974-22982
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

In this paper we introduce a simple scheme to spectrally combine four single beams using three low-cost dielectric interference filters as combining elements. 25 ns pulses from four independent and actively Q-switched fiber seed-sources are amplified in a single stage fiber-amplifier. Temporally and spatially combined 208 W of average power and 6.3 mJ of pulse energy are obtained at two different repetition frequencies. A detailed analysis of beam quality as well as the thermal behavior of the combining elements is carried out and reveals mutual dependency.