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Start date: 2010 × Publisher: Amsterdam : Elsevier × WGL Institute: MBI ×

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Now showing 1 - 3 of 3
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    Gain and lasing from CdSe/CdS nanoplatelet stripe waveguides
    (Amsterdam : Elsevier, 2022) Belitsch, Martin; Dirin, Dmitry N.; Kovalenko, Maksym V.; Pichler, Kevin; Rotter, Stefan; Ghalgaoui, Ahmed; Ditlbacher, Harald; Hohenau, Andreas; Krenn, Joachim R.
    Colloidal semiconducting nanocrystals are efficient, stable and spectrally tunable emitters, but achievable optical gain is often limited by fast nonradiative processes. These processes are strongly suppressed in slab-shaped nanocrystals (nanoplatelets), due to relaxed exciton Coulomb interaction. Here, we show that CdSe/CdS nanoplatelets can be engineered into (sub)microscopic stripe waveguides that achieve lasing without further components for feedback, i.e., just relying on the stripe end reflection. We find a remarkably high gain factor for the CdSe/CdS nanoplatelets of 1630 cm−1. In addition, by comparison with numerical simulations we assign a distinct emission peak broadening above laser threshold to emission pulse shortening. Our results illustrate the feasibility of geometrically simple monolithic microscale nanoplatelet lasers as an attractive option for a variety of photonic applications.
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    CW laser operation around 2-μm in (Tm,Yb):KLu(WO4) 2
    (Amsterdam : Elsevier, 2010) Segura, M.; Mateos, X.; Pujol, M.C.; Carvajal, J.J.; Petrov, V.; Aguiló, M.; Díaz, F.
    Laser generation in continuous wave (CW) regime at 1.94-μm from (Tm,Yb) codoped system has been investigated in two different hosts: KLu(WO 4)2 and KY(WO4)2. The high quality crystals were grown by the Top-Seeded Solution Growth Slow Cooling (TSSG-SC) method with doping levels of 2.5 at. %Tm and 5 at. %Yb. The active media were pumped with a diode laser at 980 nm. We demonstrated the superior performance of KLu(WO4)2 compared to that of KY(WO4) 2 and improved the results already obtained in the literature. The maximum laser output power reached was 157 mW for (Tm,Yb):KLu(WO 4)2 and 123 mW for (Tm,Yb):KY(WO4)2. © 2010 Published by Elsevier Ltd.
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    Femtosecond X-ray diffraction from nanolayered oxides
    (Amsterdam : Elsevier, 2010) Von Korff Schmising, C.; Harpoeth, A.; Zhavoronkov, N.; Woerner, M.; Elsaesser, T.; Bargheer, M.; Schmidbauer, M.; Vrejoiu, I.; Hesse, D.; Alexe, M.
    Femtosecond X-ray scattering offers the opportunity to investigate reversible lattice dynamics with unprecedented accuracy. We show in a prototype experiment how strain propagation modifies the functionality of a ferroelectric system on its intrinsic time scale.