Browsing by Author "Vilaseca Alavedra, Ramon"
Now showing items 1-20 of 38
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El 50 aniversari del Làser: fites aconseguides en ciència i tecnologia, i perspectives de futur
(2010-05-07)
Audiovisual
Open AccessUn làser és un dispositiu que utilitza l'emissió estimulada o induïda per generar un feix de llum. Però què ha fet fins ara i quin és el seu futur? -
Activitats del grup de recerca Dinàmica No lineal, Òptica no lineal i Làsers
(Campus de Terrassa de la UPC, 2013-06-13)
Conference report
Open Access -
Activitats del Grup de Recerca en Dinàmica no lineal, Òptica no lineal i Làsers (DONLL)"
(Campus de Terrassa de la UPC, 2013-06-13)
Conference report
Open Access -
Adiabatic population transfer in the D1 transition of 39K
(2018-06-22)
Article
Open AccessFour-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 implementation of a stochastic logic gate using a VCSEL with external optical injection
(2011)
Conference report
Open AccessWe perform numerical simulations of the dynamics of two VCSELs optically coupled in a master-slave configuration. We show that the interplay of nonlinearity and spontaneous emission noise can yield logic behavior, and the ... -
Beam focalization by chirped mirrors
(Optical Society of American (OSA), 2014)
Conference report
Restricted access - confidentiality agreementA novel application of chirped dielectric mirrors for narrow beam focalization is proposed and demonstrated numerically and experimentally. Analogy to temporal dispersion compensation by chirped dielectric mirrors is discussed. -
Broadband third harmonic generation in quadratic media with disordered ferroelectric domains
(2010)
Conference report
Restricted access - publisher's policyWe 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 ... -
Cavity behavior of second and third harmonic inhomogeneous solutions of Maxwell’s equations
(2010)
Article
Restricted access - publisher's policyWe study second and third harmonic generation of ultrashort pulses in a cavity environment and focus on the role of a phase locking phenomenon that causes the pump to trap and drag the generated harmonic fields. The results ... -
Comparative analysis of ferroelectric domain statistics via nonlinear diffraction in random nonlinear materials
(2018-01-22)
Article
Open AccessWe 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. ... -
Controlling the likelihood of rogue waves in an optically injected semiconductor laser via direct current modulation
(2014-03-06)
Article
Open AccessExtreme and rare events are nowadays the object of intensive research. Rogue waves are extreme waves that appear suddenly in many natural systems, even in apparently calm situations. Here we study numerically the rogue ... -
Diffraction control of reflected beam by chirped mirror
(2013)
Conference lecture
Restricted access - publisher's policyWe propose and demonstrate a novel functionality of chirped mirror for monochromatic light beams: a diffraction control in reflections resulting in focusing or imaging of beams. The chirped mirrors, commonly used for ... -
Domain statistics analysis of random nonlinear crystals via second harmonic generation
(Institute of Electrical and Electronics Engineers (IEEE), 2017)
Conference report
Restricted access - publisher's policyWe demonstrate an indirect non-destructive optical method for the characterization of ferroelectric domain size and distribution based on the analysis of the generated second harmonic spatial distribution. This method is ... -
Einstein : física, enginyeria i matemàtiques
(2004-09-15)
Audiovisual
Open Access"L’any 2005 fou declarat Any Mundial de la Física. Coincideix amb el centenari de publicacions d’Albert Einstein sobre el moviment brownià, sobre els quanta de llum i sobre relativitat especial. Les idees d’Einstein ... -
Einstein: física, tecnologia i matemàtiques
(2014-01-31)
Other
Open Access"L’any 2005 fou declarat Any Mundial de la Física. Coincideix amb el centenari de publicacions d’Albert Einstein sobre el moviment brownià, sobre els quanta de llum i sobre relativitat especial. Les idees d’Einstein ... -
El láser, fuente de fenómenos y dinámicas no lineales
(2010-10-01)
Article
Restricted access - publisher's policy -
ELECTRICITAT I MAGNETISME (Examen 2n Quadr.)
(Universitat Politècnica de Catalunya, 2005-06-06)
Exam
Restricted access to the UPC academic community -
Enhanced efficiency of the second harmonic inhomogeneous component in an opaque cavity
(2011-05-15)
Article
Open AccessIn this Letter, we experimentally demonstrate the enhancement of the inhomogeneous second harmonic conversion in the opaque region of a GaAs cavity with efficiencies of the order of 0.1% at 612nm, using 3 ps pump pulses ... -
Entrevista del professor Ramon Vilaseca al professor Daniel Gauthier.
(2012-04-17)
Audiovisual
Open AccessTalking & Researching -
Experimental and theoretical study of second and third harmonic generation in amorphous silicon
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2022)
Conference report
Restricted access - publisher's policyWe report contrasted experimental and theoretical results on second and third harmonic generation from an amorphous silicon nanolayer. We perform this study by analysing the harmonic optical signals generated when fs and ... -
Flat focusing mirror
(MACMILLAN PUBLISHERS LIMITED, 2014-09-17)
Article
Open AccessThe control of spatial propagation properties of narrow light beams such as divergence, focusing or imaging are main objectives in optics and photonics. In this letter, we propose and demonstrate experimentally a flat ...
