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- Item27 W 2.1 µm OPCPA system for coherent soft X-ray generation operating at 10 kHz(Washington, DC : Soc., 2020) Feng, Tianli; Heilmann, Anke; Bock, Martin; Ehrentraut, Lutz; Witting, Tobias; Yu, Haohai; Stiel, Holger; Eisebitt, Stefan; Schnürer, MatthiasWe 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 Agreement
- ItemTowards Poisson noise limited optical pump soft X-ray probe NEXAFS spectroscopy using a laser-produced plasma source(Washington, DC : Soc., 2019) Jonas, Adrian; Stiel, Holger; Glöggler, Lisa; Dahm, Diana; Dammer, Katharina; Kanngießer, Birgit; Mantouvalou, IoannaWe present a laboratory setup for near edge X-ray absorption spectroscopy (NEXAFS) in the soft X-ray regime between 284 eV to 1303 eV with a resolving power of up to 1370. Based on a laser-produced plasma source, a pair of identical reflection zone plates and an X-ray CCD camera, the setup is intended for optical pump X-ray probe NEXAFS measurements with a detectable change in absorption of the excited sample down to 10-4 and 500 ps time resolution. Because of the high stability of the source the statistical error only depends on the detector response and the number of photons detected and can reach the detector noise limit after a couple of thousands single shots. Thus, structure-function relationship investigations of bio-molecules are rendered feasible in the laboratory.
- ItemTowards Poisson noise limited optical pump soft X-ray probe NEXAFS spectroscopy using a laser-produced plasma source: erratum(Washington, DC : Soc., 2021) Jonas, Adrian; Stiel, Holger; Glöggler, Lisa; Dahm, Diana; Dammer, Katharina; Kanngießer, Birgit; Mantouvalou, IoannaWe provide corrections for our previous publication [Opt. Express27, 36524 (2019)10.1364/OE.27.036524].