Now showing items 1-20 of 114

    • Activitats del grup de recerca Dinàmica No lineal, Òptica no lineal i Làsers 

      Vilaseca Alavedra, Ramon (Campus de Terrassa de la UPC, 2013-06-13)
      Conference report
      Open Access
    • Adiabatic population transfer in the D1 transition of 39K 

      Fernández Soler, Juan José; Font García, Josep Lluís; Vilaseca Alavedra, Ramon (2018-06-22)
      Article
      Open Access
      Four-photon stimulated Raman adiabatic passage–like (STIRAP-like) processes in the frame of the D1 optical transition line of atomic 39K are investigated theoretically by means of a rigorous model that takes into account ...
    • Asymmetric solitons and domain walls supported by inhomogeneous defocusing nonlinearity 

      Kartashov, Yaroslav V.; Lobanov, Valery E.; Malomed, Boris A.; Torner Sabata, Lluís (2013-12-01)
      Article
      Restricted access - publisher's policy
      We show that an inhomogeneous defocusing nonlinearity that grows toward the periphery in the positive and negative transverse directions at different rates can support strongly asymmetric fundamental and multipole bright ...
    • Avalanche of stimulated forward scattering in high harmonic generation 

      Serrat Jurado, Carles; Roca, David; Budesca, Josep M.; Seres, Jozsef; Seres, Enikoe; Aurand, Bastian; Hoffmann, Andreas; Namba, Shinichi; Kuehl, Thomas; Spielmann, Christian (2016-04-05)
      Article
      Open Access
      Optical amplifiers in all ranges of the electromagnetic spectrum exhibit an essential characteristic, namely the input signal during the propagation in the amplifier medium is multiplied by the avalanche effect of the ...
    • Broadband third harmonic generation in quadratic media with disordered ferroelectric domains 

      Kalinowski, K.; Roppo, Vito; Wang, W.; Neshev, Dragomir N.; Kong, Y.; Cojocaru, Crina; Trull Silvestre, José Francisco; Vilaseca Alavedra, Ramon; Staliunas, Kestutis; Krolikowski, Wieslaw; Kivshar, Yu. (2010)
      Conference report
      Restricted access - publisher's policy
      We study nonlinear frequency generation in media with random ferroelectric domain structure. We show that randomness enables one to realize broadband third harmonic generation via cascading of two second order quasi-phase ...
    • Characterization of a quantum frequency converter for quantum repeater applications 

      Fernandez Gonzalvo, Xavier (Universitat Politècnica de Catalunya, 2012-09-03)
      Master thesis
      Open Access
      [ANGLÈS] Quantum frequency conversion of quantum memory compatible photons to telecom wavelength is a requirement for the implementation of scalable quantum repeaters, a key ingredient for long distance quantum communications ...
    • Coherent amplification of attosecond light pulses in the water-window spectral region 

      Serrat Jurado, Carles; Roca, David; Seres, Jozsef (2015-02-23)
      Article
      Open Access
      We present a theoretical study on coherent extreme ultraviolet (XUV) attosecond pulse amplification mediated by nonlinear parametric enhanced forward scattering occurring in the interaction of a strong femtosecond infrared ...
    • Compact ultrafast semiconductor disk laser: targeting GFP based nonlinear applications in living organisms 

      Loza Álvarez, Pablo; Artigas García, David; Santos, Susana I.C.O.; Aviles Espinosa, Rodrigo; Filippidis, George; Hamilton, Craig; Malcolm, Graeme; Weingarten, Kurt J.; Südmeyer, Thomas; Barbarin, Yohan; Keller, Ursula (2011-03-01)
      Article
      Restricted access - publisher's policy
      We present a portable ultrafast Semiconductor Disk Laser (SDL) (or vertical extended cavity surface emitting laser—VECSELs), to be used for nonlinear microscopy. The SDL is modelocked using a quantum-dot semiconductor ...
    • Comparative analysis of ferroelectric domain statistics via nonlinear diffraction in random nonlinear materials 

      Wang, Bin; Switowski, K; Cojocaru, Crina; Roppo, V; Sheng, Yan; Escalora, M.; Kisielewski, J.; Pawlak, D.; Vilaseca Alavedra, Ramon; Akhouayri, H.; Krolikowski, Wieslaw; Trull Silvestre, José Francisco (2018-01-22)
      Article
      Open Access
      We present an indirect, non-destructive optical method for domain statistic characterization in disordered nonlinear crystals having homogeneous refractive index and spatially random distribution of ferroelectric domains. ...
    • Controllable coherent backscattering of light in disordered media filled with liquid crystal 

      Trull Silvestre, José Francisco; Cuevas, Marc; Salud Puig, Josep; Cojocaru, Crina; López Pérez, David Orencio (2018-05-09)
      Article
      Open Access
      We have investigated multiple scattering of light in a disordered system based on liquid crystals for a temperature-controllable random laser. Coherent backscattering measurements at several temperatures have been well ...
    • Controlling the leader-laggard dynamics in delay-synchronized lasers 

      Martínez González, Cristina; Torrent Serra, Maria del Carmen; García Ojalvo, Jordi (2007)
      Article
      Restricted access - publisher's policy
    • Core-level attosecond transient absorption spectroscopy of laser-dressed solid films of Si and Zr 

      Seres, Enikoe; Seres, Jozsef; Serrat Jurado, Carles; Namba, Shinichi (American Physical Society, 2016-10-12)
      Article
      Open Access
      We investigated experimentally as well as theoretically the ultrafast response of the wave function of the conduction band (CB) of Si and Zr to a near-infrared laser field using extreme ultraviolet (XUV) absorption ...
    • Design and characterization of fs OPO for the near-to mid-infrared 

      Sánchez Bautista, Enrique (Universitat Politècnica de Catalunya, 2012-09-12)
      Master thesis
      Open Access
      [ANGLÈS] We demonstrate a stabilized phase-locked divide-by-2 synchronously pumped optical parametric oscillator (SPOPO) based on BiB3O6 (BIBO) a crystal with type I interaction in the xz plane operating in degenerate ...
    • Distinguishing signatures of determinism and stochasticity in spiking complex systems 

      Aragoneses Aguado, Andrés; Rubido, Nicolás; Tiana Alsina, Jordi; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2013-05-07)
      Article
      Open Access
    • Dynamic behaviour in a nonlinear directional coupler with feedback 

      Artigas García, David; Dios Otín, Víctor Federico; Canal Bienzobas, Fernando (TAYLOR & FRANCIS LTD, 1997-06-30)
      Article
      Open Access
      A new kind of resonator based on a nonlinear directional coupler with feedback is presented. The steady states are found and the map of the system is iterated, showing the existence of bistability, period doubling and ...
    • Dynamic versus Anderson wave-packet localization 

      Borovkova, Olga V.; Lobanov, Valery E.; Kartashov, Yaroslav V.; Vysloukh, Victor A.; Torner Sabata, Lluís (APS Physics, 2015-06-18)
      Article
      Open Access
      We address the interplay between two fundamentally different wavepacket localization mechanisms, namely resonant dynamic localization due to collapse of quasi-energy bands in periodic media and disorder-induced Anderson ...
    • El láser, fuente de fenómenos y dinámicas no lineales 

      Vilaseca Alavedra, Ramon (2010-10-01)
      Article
      Restricted access - publisher's policy
    • Electrodynamics of conductive oxides: intensity-dependent anisotropy, reconstruction of the effective dielectric constant, and harmonic generation 

      Scalora, Michael; Trull Silvestre, José Francisco; Ceglia, Domenico de; Vincenti, M. A.; Akozbek, Neset; Coppens, Zachary; Rodríguez Suñé, Laura; Cojocaru, Crina (2020-05-13)
      Article
      Open Access
      We study electromagnetic pulse propagation in an indium tin oxide nanolayer in the linear and nonlinear regimes. We use the constitutive relations to reconstruct the effective dielectric constant of the medium, and show ...
    • Enhancement of nonlinear optical phenomena by localized resonances 

      Rodríguez Echarri, A.; Cox, Joel D.; Yu, Renwen; García de Abajo, F. Javier (ACS, 2018-01-20)
      Article
      Open Access
      Nonlinear optics at the nanoscale is severely limited by the small departure of available materials from linear behavior. Despite intense efforts placed into overcoming this problem using multiple strategies for enhancing ...
    • Entangled Photon Source for Single Molecule Microscopy 

      Abbasi Zargaleh, Soroush (Universitat Politècnica de Catalunya, 2013-02-11)
      Master thesis
      Open Access
      [ANGLÈS] This paper presents experimental implementation of highly correlated photons for single molecules microscopy application. We designed and built a Type-II Spontaneous Parametric Down Conversion (SPDC) photon pair ...