2 results
Search Results
Now showing 1 - 2 of 2
- 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
- ItemOriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared(Frankfurt, M. : Beilstein-Institut zur Förderung der Chemischen Wissenschaften, 2018-10-23) Loiko, Pavel; Bora, Tanujjal; Serres, Josep Maria; Yu, Haohai; Aguiló, Magdalena; Díaz, Francesc; Griebner, Uwe; Petrov, Valentin; Mateos, Xavier; Dutta, JoydeepZinc oxide (ZnO) nanorods (NRs) oriented along the crystallographic [001] axis are grown by the hydrothermal method on glass substrates. The ZnO NRs exhibit a broadband (1–2 µm) near-IR absorption ascribed to the singly charged zinc vacancy VZn−1. The saturable absorption of the ZnO NRs is studied at ≈1 µm under picosecond excitation, revealing a low saturation intensity, ≈10 kW/cm2, and high fraction of the saturable losses. The ZnO NRs are applied as saturable absorbers in diode-pumped Yb (≈1.03 µm) and Tm (≈1.94 µm) lasers generating nanosecond pulses. The ZnO NRs grown on various optical surfaces are promising broadband saturable absorbers for nanosecond near-IR lasers in bulk and waveguide geometries.