Now showing items 1-20 of 99

  • A Comparison of Nonlinear Media for All-Optical Signal Processing 

    Martínez Díaz, Jordi (Universitat Politècnica de Catalunya / Technical University of Denmark. Fotonik Department / Politecnico di Torino. Dipartimento di elettronica, 2013-07-31)
    Master thesis (pre-Bologna period)
    Open Access
    Covenantee:  Politecnico di Torino
    [ANGLÈS] This thesis is focused on benchmarking different nonlinear media that are currently used for all-optical signal processing. The materials survey has been based on both low linear losses and highly nonlinear ...
  • 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 ...
  • Classical and quantum applications of optical four wave mixing in an integrated silicon nitride platform 

    Triginer Garcés, Gil (Universitat Politècnica de Catalunya, 2014-12-19)
    Master thesis (pre-Bologna period)
    Open Access
    Covenantee:  University of Colorado Boulder
    [ANGLÈS] Integrated photonics provide a very versatile platform for nonlinear optics experiments, due to the tight field confinement that high index contrast structures offer and their great degree of tunability. Two ...
  • 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 ...
  • Development of high-power picosecond fiber-based ultraviolet source 

    Canals Casals, Josep (Universitat Politècnica de Catalunya, 2014-09-08)
    Master thesis
    Open Access
    [ANGLÈS] We report a high-power picosecond ultraviolet source at 266 nm in a compact design based on single-pass fourth harmonic generation and mode-locked Yb-fiber laser. The configuration has two stages: SHG of 1064 nm ...
  • 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 ...
  • Efficient generation of new optical wavelengths by means of second harmonic generation in AlGaAs Bragg reflection waveguides 

    Valles Mari, Adam (Universitat Politècnica de Catalunya, 2011-09-19)
    Master thesis (pre-Bologna period)
    Open Access
    English: In this project has been designed and implemented a setup to produce the nonlinear process of the second harmonic generation (SHG) in Bragg reflection waveguides (BRW). Starting with the adjustment of a tunable ...