OSA Open Access Publishing AgreementFeng, TianliHeilmann, AnkeBock, MartinEhrentraut, LutzWitting, TobiasYu, HaohaiStiel, HolgerEisebitt, StefanSchnürer, Matthias2021-11-302021-11-302020https://oa.tib.eu/renate/handle/123456789/7567https://doi.org/10.34657/6614We developed a high power optical parametric chirped-pulse amplification (OPCPA) system at 2.1 µm harnessing a 500 W Yb:YAG thin disk laser as the only pump and signal generation source. The OPCPA system operates at 10 kHz with a single pulse energy of up to 2.7 mJ and pulse duration of 30 fs. The maximum average output power of 27 W sets a new record for an OPCPA system in the 2 µm wavelength region. The soft X-ray continuum generated through high harmonic generation with this driver laser can extend to around 0.55 keV, thus covering the entire water window (284 eV - 543 eV). With a repetition rate still enabling pump-probe experiments on solid samples, the system can be used for many applications. © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreementenghttps://www.osapublishing.org/library/license_v1.cfm530optical parametric chirped-pulse amplification (OPCPA)single pulse energysoft X-ray continuumArticle