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Opt Express. 2009 Dec 7;17(25):22974-82. doi: 10.1364/OE.17.022974.

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

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Friedrich-Schiller University, Institute of Applied Physics, Albert-Einstein-Str. 15, 07745 Jena, Germany.


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.

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