Browsing by Subject "Nonlinear optics"
Now showing items 1-20 of 133
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Abrupt transition from low-coherence to high-coherence radiation in a semiconductor laser with optical feedback
(2023-01-19)
Article
Open AccessSemiconductor 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
(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 ... -
Asymmetric solitons and domain walls supported by inhomogeneous defocusing nonlinearity
(2013-12-01)
Article
Restricted access - publisher's policyWe 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
(2016-04-05)
Article
Open AccessOptical 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
(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 ... -
Characterization of a quantum frequency converter for quantum repeater applications
(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
(2015-02-23)
Article
Open AccessWe 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
(2011-03-01)
Article
Restricted access - publisher's policyWe 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
(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. ... -
Controllable coherent backscattering of light in disordered media filled with liquid crystal
(2018-05-09)
Article
Open AccessWe 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
(2007)
Article
Restricted access - publisher's policy -
Core-level attosecond transient absorption spectroscopy of laser-dressed solid films of Si and Zr
(American Physical Society, 2016-10-12)
Article
Open AccessWe 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
(Universitat Politècnica de Catalunya, 2022-06-13)
Master thesis
Open Access
Covenantee: École polytechnique de MontréalHeralded 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
(2023-01-30)
Article
Open AccessWhen 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
(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 a tunable continuous wave optical parametric oscillator as a light source for characterizing optical components in the aerospace sector
(Universitat Politècnica de Catalunya, 2021-07-19)
Master thesis
Restricted access - author's decision
Covenantee: Radiant Light -
Distinguishing signatures of determinism and stochasticity in spiking complex systems
(2013-05-07)
Article
Open Access -
Domain inverted acousto- and electrooptic devices and their application to optical communication, sensing, laser sources, and quantum key distribution
(2013-11)
Article
Restricted access - publisher's policyThe current status of domain inverted lithium niobate acousto- and electrooptic devices is reviewed. We introduce the main domain microengineering techniques and their impact on modulators' performance in terms of reduced ... -
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 ...
