Now showing items 21-40 of 118

  • Engineerable generation of quadratic solitons in synthetic phase-matching 

    Carrasco Rodríguez, Sílvia; Pérez Torres, Juan; Torner Sabata, Lluís; Schiek, R (2000-09)
    Article
    Restricted access - publisher's policy
    We show that the efficiency and the mismatch bandwidth of quadratic soliton formation under conditions of second-harmonic generation can be enhanced in an important way in synthetic phase-matching profiles. Soliton excitation ...
  • Engineering the frequency correlations of entangled two-photon states by achromatic phase-matching 

    Pérez Torres, Juan; Macia, F; Carrasco, S; Torner Sabata, Lluís (2005-02)
    Article
    Restricted access - publisher's policy
    We put forward a new method to control the spectra of photon pairs generated in parametric downconversion that allows their spectral properties to be tuned from correlation to anticorrelation, including uncorrelation. The ...
  • Enhancement of the sensitivity of a temperature sensor based on fiber Bragg gratings via weak value amplification 

    Salazar-Serrano, L. J.; Barrera, D.; Amaya, W.; Sales, S.; Pruneri, Valerio; Capmany, J.; Pérez Torres, Juan (OSA, 2015-09-01)
    Article
    Open Access
    We present a proof-of-concept experiment aimed at increasing the sensitivity of temperature sensors implemented with Fiber Bragg gratings by making use of a weak value amplification scheme. The technique requires only ...
  • Enhancing the axial resolution of quantum optical coherence tomography by chirped QPM 

    Carrasco, S; Pérez Torres, Juan; Torner Sabata, Lluís; Sergienko, A; Saleh, B E A; Teich, M C (2004-10)
    Article
    Restricted access - publisher's policy
    We show theoretically that a chirped quasi-phase-matching nonlinear crystal structure can significantly enhance the axial resolution in quantum optical coherence tomography by increasing the spectral width of the generated ...
  • Enhancing the sensitivity and robustness of label-free imaging systems via stimulated Raman adiabatic passage 

    León Montiel, R.D.J.; Pérez Torres, Juan (2012-01)
    Article
    Restricted access - publisher's policy
    We show that the sensitivity and robustness of a label-free optical imaging technique based on stimulated Raman scattering (SRS) can be enhanced by using resonant optical transitions in a Raman adiabatic passage scheme. ...
  • Experimental detection of transverse particle movement with structured light 

    Rosales Guzmán, Carmelo; Hermosa, Nathaniel; Belmonte Molina, Aniceto; Pérez Torres, Juan (MACMILLAN PUBLISHERS LIMITED, 2013-10-02)
    Article
    Open Access
    One procedure widely used to detect the velocity of a moving object is by using the Doppler effect. This is the perceived change in frequency of a wave caused by the relative motion between the emitter and the detector, ...
  • Flux enhancement of photons entangled in orbital angular momentum 

    Palacios, Silvana; León Montiel, R.D.J.; Hendrych, Martin; Valencia, Alejandra; Pérez Torres, Juan (2011-07-18)
    Article
    Restricted access - publisher's policy
    Entangled photons are generally collected by detection systems that select their certain spatial modes, for example using single-mode optical fibers. We derive simple and easy-to-use expressions that allow us to maximize ...
  • Four-wave mixing of light beams with engineered orbital angular momentum in cold cesium atoms 

    Barreiro, S; Tabosa, J W R; Pérez Torres, Juan; Deyanova, Y; Torner Sabata, Lluís (2004-07)
    Article
    Restricted access - publisher's policy
    We report an experimental demonstration that shows that the spatial structure carried by engineered coherent superpositions of light beams with orbital angular momentum can be mapped into the nonlinear polarization induced ...
  • Frequency conversion of structured light 

    Steinlechner, Fabian; Hermosa, Nathaniel; Pruneri, Valerio; Pérez Torres, Juan (Macmillan Publishers, 2016-02-15)
    Article
    Open Access
    Coherent frequency conversion of structured light, i.e. the ability to manipulate the carrier frequency of a wave front without distorting its spatial phase and intensity profile, provides the opportunity for numerous novel ...
  • Frequency doubling of femtosecond pulses in walk-off compensated npp 

    Pérez Torres, Juan; Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís; Vanstryland, E W (2000-12)
    Article
    Open Access
    Summary form only given. N-(4-nitrophenyl)-L-prolinol (NPP) is an organic molecular crystal developped by molecular engineering, that exhibits one of the highest phase-matchable second-order susceptibilities reported so ...
  • From topological charge information to sets of solitons in quadratric nonlinear media 

    Torner Sabata, Lluís; Pérez Torres, Juan; Petrov, D V; Soto-Crespo, J M (1998-10)
    Article
    Restricted access - publisher's policy
    We describe the principle of operation of a new class of optical devices operating in quadratic non-linear media that mix wave front topological charge dislocations nested in focused light beams and produce certain patterns ...
  • Gaussian-beam excitation of 3d nonlinear waves 

    Mihalache, Dumitru; Baboiu, Daniel; Mazilu, Dumitru; Torner Sabata, Lluís; Pérez Torres, Juan (1994-07)
    Article
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    The propagation of stationary three-dimensional nonlinear guided waves and of Gaussian beams in a slab waveguide in which the cladding displays both Kerr-law and saturable instantaneous self-focusing nonlinearities is ...
  • Generating ultra-broadband biphotons via chirped QPM down-conversion 

    Teich, M C; Nasr, M B; Carrasco, S; Saleh, B E A; Sergienko, A V; Pérez Torres, Juan; Torner Sabata, Lluís; Hum, D S; Fejer, M M (2008-12)
    Article
    Restricted access - publisher's policy
    Nonlinear Optics: Nonlinear optical response has enhanced our ability to produce coherent light throughout the optical spectral region.
  • Generation of multicolor spatial solitons with pulsed light 

    Carrasco Rodríguez, Sílvia; Pérez Torres, Juan; Artigas García, David; Torner Sabata, Lluís (2001-05)
    Article
    Restricted access - publisher's policy
    The impact of temporal effects to the generation of multiple wave quadratic spatial solitons with pulsed light is shown. We examine soliton formation under conditions of second-harmonic generation but our conclusions are ...
  • Generation of polarization-entangled photon pairs in a Bragg reflection waveguide 

    Valles Marin, Adam; Hendrych, M.; Svozilik, Jiri; Machulka, R.; Abolghasem, P.; Kang, D.; Bijlani, B.J.; Helmy, A.S.; Pérez Torres, Juan (2013-06)
    Article
    Open Access
    We demonstrate experimentally that spontaneous parametric down-conversion in an AlxGa1−xAs semiconductor Bragg reflection waveguide can make for paired photons highly entangled in the polarization degree of freedom at the ...
  • Generation of tunable entanglement and violation of a Bell-like inequality between different degrees of freedom of a single photon 

    Vallés, Adam; Ambrosio, Vincenzo D'; Hendrych, Martin; Micuda, Micha; Marrucci, Lorenzo; Sciarrino, Fabio; Pérez Torres, Juan (American Physical Society, 2014-11-20)
    Article
    Open Access
  • Globally-linked vortex clusters 

    Crasovan, L C; Vekslerchik, V; Mihalache, Dumitru; Pérez Torres, Juan; Perez-Garcia, V M; Torner Sabata, Lluís (Kluwer, 2004-09-30)
    Part of book or chapter of book
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    We show the existence of a rich variety of fully stationary vortex structures made of an increasing number of vortices nested in paraxial wave fields confined by symmetric and asymmetric harmonic trapping potentials in ...
  • Guided to leaky mode transition in uniaxial optical slab waveguides 

    Torner Sabata, Lluís; Recolons Martos, Jaume; Pérez Torres, Juan (1993-10)
    Article
    Open Access
    The guided-to-leaky hybrid mode transition in slab optical waveguides made on uniaxial crystals such as LiNbO/sub 3/, or LiTaO/sub 3/, is analyzed. Two different guided-to-leaky transitions have been identified, namely the ...
  • Guided-to-leaky mode transition in uniaxial optical slab waveguides 

    Torner Sabata, Lluís; Recolons Martos, Jaume; Pérez Torres, Juan (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-10-01)
    Article
    Open Access
    The guided-to-leaky hybrid mode transition in slab optical waveguides made on uniaxial crystals such as LiNbO3, or LiTaO 3, is analyzed. Two different guided-to-leaky transitions have been identified, namely the ordinary ...
  • Helico-conical optical beams self-heal 

    Hermosa, N.; Rosales Guzmán, C.; Pérez Torres, Juan (2013-01)
    Article
    Open Access
    An optical beam is said to be self-healing when, distorted by an obstacle, the beam corrects itself upon propagation. In this Letter we show, through experiments supported by numerical simulations, that Helico-conical ...