• Observation of self-focusing of light mediated by cubic nonlinearities in potassium titanyl phosphate 

    Carrasco Rodríguez, Sílvia; Kim, Hongki; Stegeman, George; Loza Alvarez, Pablo; Torner Sabata, Lluís (2002-11)
    Article
    Accés restringit per política de l'editorial
    We report our observations of the transient self-narrowing of light beams mediated by dominant Kerr nonlinearities and two-photon absorption in a bulk potassium titanyl phosphate crystal near conditions for second-harmonic ...
  • STED imaging performance estimation by means of Fourier transform analysis 

    Merino, David; Mallabiabarrena, Arrate; Andilla, Jordi; Artigas García, David; Zimmermann, Timo; Loza Alvarez, Pablo (2017-05-01)
    Article
    Accés obert
    Due to relatively high powers used in STED, biological samples may be affected by the illumination in the process of image acquisition. Similarly, the performance of the system may be limited by the sample itself. Optimization ...
  • Sub-diffraction discrimination with polarization-resolved two-photon excited fluorescence microscopy 

    Artigas García, David; Merino, David; Polzer, Christoph; Loza Alvarez, Pablo (Optical Society of American (OSA), 2017-08-20)
    Article
    Accés obert
    Imaging molecular structures separated by distances of a few nanometers still represents a complex challenge. Moreover, it is normally restricted to observations on thin (few micrometers) samples. In this work, we rotate ...