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We present a high power single-frequency ytterbium fiber amplifier systemwith an output power of 30 W at 1091 nm. The amplifier system consists of twostages, a preamplifier stage in which amplified spontaneous emission isefficiently suppressed (>40 dB) and a high power amplifier with an efficiencyof 52 %. Two different approaches of frequency doubling are compared. Weachieve 8.6 W at 545.5 nm by single-pass frequency doubling in a MgO-dopedperiodically poled stoichiometric LiTaO3 and up to 19.3 W at 545.5 nm byfrequency doubling with a lithium-triborate (LBO) crystal in an externalenhancement cavity.

High power, continuous-wave, single frequency fiber amplifier at 1091 nm and frequency doubling to 545.5 nm