Browsing by Subject "Òptica no lineal"

Now showing items 1-20 of 144

    • 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 ...

    • Abrupt transition from low-coherence to high-coherence radiation in a semiconductor laser with optical feedback 

      Duque Gijón, María; Masoller Alonso, Cristina; Tiana Alsina, Jordi (2023-01-19)
      Article
      Open Access
      Semiconductor lasers are very sensitive to optical feedback. Although it is well known that coherent feedback lowers the threshold of the laser, the characteristics of the transition from low-coherence radiation—dominated ...

    • 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 ...

    • All-optical soliton control in photonic lattices 

      Xu, Zhiyong (Universitat Politècnica de Catalunya, 2007-11-27)
      Doctoral thesis
      Open Access
      Los solitones ópticos son paquetes de luz (haces y/o pulsos) que no se dispersan gracias al balance entre difracción/dispersión y no linealidad. Al propagarse e interactuar los unos con los otros muestran propiedades que ...

    • 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. ...

    • Continuous-wave optical parametric oscillators and frequency conversion sources from the ultraviolet to the mid-infrared 

      Devi, Kavita (Universitat Politècnica de Catalunya, 2013-10-24)
      Doctoral thesis
      Open Access
      High-power, continuous-wave (cw) optical parametric oscillators (OPOs), from the ultraviolet (UV) and visible to the near- and mid-infrared (IR) wavelength range, are of interest for a variety of applications such as ...

    • 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 ...

    • Custom nonlinearity profile for integrated quantum light sources 

      Poveda Hospital, Salvador (Universitat Politècnica de Catalunya, 2022-06-13)
      Master thesis
      Open Access
      Covenantee:   École polytechnique de Montréal
      Heralded single-photon sources are a fundamental building block for optical quantum technologies. These sources need to be unfiltered and integrated to have good scalability and avoid unnecessary losses. To attain this ...

    • Deciphering the Properties of Nanoconfined Aqueous Solutions by Vibrational Sum Frequency Generation Spectroscopy 

      Das, Banshi; Ruiz Barragán, Sergio; Marx, Dominik (2023-01-30)
      Article
      Open Access
      When confined between walls at nanometer distances, water exhibits surprisingly different properties with reference to bare interfacial water. Based on computer simulations, we demonstrate how vibrational sum frequency ...

    • 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 ...