In contrast to most publications and developments concerning frequency doubling in this research neither a pulsed nor a single-frequency laser source is used. Instead of these lasers the SH is generated with a 200 W cw fiber laser with 1.6 nm bandwidth as the fundamental source in order to extend its application possibilities in laser macro machining. In experimental studies 3.7 W of frequency doubled radiation (@543 nm) at 3.2 % optic-optical conversion efficiency are generated. The lattice structure of KTP for SHG@1086 nm is analyzed using the Laue-method and additionally the temperature, crystal length and angular dependences of the frequency doubled output power are investigated.
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