Person: Weigand Talavera, Rosa María
Universidad Complutense de Madrid
Faculty / Institute
Now showing 1 - 10 of 13
PublicationLíneas de investigación del Grupo UCM de Física del Láser, Óptica Cuántica y Óptica No Lineal(Sociedad Española de óptica, 2011) Antón Revilla, Miguel Ángel; Arrieta Yáñez, Francisco; Cabrera Granado, Eduardo; Carreño Sánchez, Fernando; Ezquerro Rodríguez, José Miguel; Gómez Calderón, Óscar; Gonzalo Fonrodona, Isabel; Guerra Pérez, José Manuel; Melle Hernández, Sonia; Soler Rus, Miguel Odín; Sánchez Balmaseda, Margarita María; Weigand Talavera, Rosa MaríaEn este trabajo presentamos las líneas de investigación del Grupo de Física del Láser, Óptica Cuántica y Óptica No Lineal de la UCM. La investigación comprende trabajos experimentales y teóricos en el desarrollo de prototipos de láser, análisis de inestabilidades espacio-temporales en láseres de gran apertura, el estudio de propagación de radiación en régimen de luz lenta y de pulsos ultracortos en medios resonantes y no resonantes, la generación de radiación por procesos no lineales y el estudio de memorias ópticas por eco fotónico. PublicationOn the Q-switched operation of Titanium: sapphire lasers using a graphene-based saturable absorber mirror(Elsevier, 2015-09) Weigand Talavera, Rosa María; Pinto, T.; Crespo, H. M.; Guerra, J. M.We numerically demonstrate Q-switched operation of Titanium:Sapphire lasers using mono and multilayer graphene, deposited on a totally reflecting end mirror as a saturable absorber. Output energies, pulse duration and repetition frequencies of the Q-switched pulse trains are given as a function of the pump intensity for different number of graphene layers and cavity lengths. For the geometries studied, pulses from 17 to 491 ns can be achieved, with energies ranging from 11 to 74 μJ and repetition rates from 0.06 to 2.5 MHz. These results can be useful for designing and building laser cavities for Q-switched and mode-locked operation in laser media with short lifetimes as Titanium:Sapphire. PublicationDispersion-scan measurements of few-cycle pulses compressed with the multiplate continuum process(IEEE, 2017-10-30) Canhota, Miguel; Weigand Talavera, Rosa María; Crespo, Helder M. PublicationChirp-dependent dual light emission in Na_(0.95)Er_(0.05)Nb_(0.9)Ti_(0.1)O_(3) perovskite(Elsevier, 2022-07) Pérez Benito, Óscar; Antón Revilla, Miguel Ángel; Urones Garrote, Esteban; García Martín, Susana; García González, Ester; Weigand Talavera, Rosa MaríaPolar Na_(0.95)Er_(0.05)Nb_(0.9)Ti_(0.1)O_(3) perovskite has been synthesized as a nanostructured material by microwave assisted hydrothermal method. The characterization indicates that erbium is a constituent of the crystal structure and is preferentially located in sodium positions. The compound combines the nonlinear optical properties of the host (NaNb_(0.9)Ti_(0.1)O_(2.95) and the fluorescent properties of the Er^(3+)-dopant. Under excitation by a single femtosecond (< 10 fs) laser in the near-infrared region, simultaneous dual emission signals of second harmonic generation (SHG) and up-converting fluorescence (UCF) are observed and the nonlinear dependencies of the SHG and UCF intensities on the excitation intensity are measured. In addition, both emissions are shown to be sensitive to the chirp of the exciting pulses, and for UCF, it can be explained by means of a simple theoretical model based on the density matrix equations. These nano-structured particles with chirp-dependent dual behavior can be very advantageous when used in biological systems, since they can provide complementary information in different spectral ranges and tissues and are susceptible of coherent control, which can be both useful in optical microscopy and bioimaging. PublicationAplicabilidad del software de Diferencias Finitas en el Dominio del Tiempo (FDTD) al aprendizaje en Fotónica(2017-01) Weigand Talavera, Rosa María; Calvo Padilla, María Luisa; Gonzalo Fonrodona, Isabel; Villafranca Velasco, AitorSe generaran topografías FDTD en sistemas fotónicos para ejemplificación en clase por parte del profesor, realización de trabajos en grupo, realización de prácticas de laboratorio, autoaprendizaje del alumno y Trabajos Fin de Grado y Máster. PublicationInline self-diffraction dispersion-scan of over octave-spanning pulses in the single-cycle regime(Optical Soc Amer, 2017-08-01) Canhota, Miguel; Silva, Francisco; Weigand Talavera, Rosa María; Crespo, Helder M.We present an implementation of dispersion-scan based on self-diffraction (SD d-scan) and apply it to the measurement of over octave-spanning sub-4-fs pulses. The results are compared with second-harmonic generation (SHG) d-scan. The efficiency of the SD process is derived theoretically and compared with the spectral response retrieved by the d-scan algorithm. The new SD d-scan has a robust inline setup and enables measuring pulses with over-octave spectra, single-cycle durations, and wavelength ranges beyond those of SHG crystals, such as the ultraviolet and the deep-ultraviolet. (C) 2017 Optical Society of America. PublicationOptical transmission properties of Pentelic and Paros marble(Optical Society Of America, 2015-02-01) Weigand Talavera, Rosa María; García, Pablo A.; Campos Acosta, Joaquín; Storch de Gracía, JacoboAncientGreek and Roman sources report that the statue of Zeus in Olympia had a head, and in particular eyes, similar to the description of Zeus by Homer, so we think that the statue was visible to the human eye. Since the temple was 12mhigh, and had a small door and no windows, the illumination of the statue by conventionalmedia is questionable. The aimof this paper is to characterize the optical transmission of Paros and Pentelic marble to demonstrate that it was possible to have the Zeus temple illuminated through the roof marble tiles. Spectral absolute transmittance measurements were taken in samples with different thicknesses using a calibrated spectrophotometer, as well as total transmittance measurements using a luxmeter. The results show that both types of marble transmit light and that Pentelic marble has a higher transmittance in the visible range than Paros marble in some cases and hence could have been one reason, among others, to change the type of marble in the roof in antiquity. PublicationQ-switched operation with carbon-based saturable absorbers in a Nd:YLF Laser(MDPI, 2015-09) Weigand Talavera, Rosa María; Sánchez Balmaseda, Margarita María; Guerra Pérez, José ManuelWe have numerically studied the influence of the absorption modulation depth of carbon-based saturable absorbers (graphene and carbon nanotubes (CNTs)) on the Q-switched regime of a diode-pumped Nd:YLF laser. A short-length cavity was used with an end mirror on which CNTs or mono- or bi-layer graphene were deposited, forming a saturable absorber mirror (SAM). Using a standard model, the generated energy per pulse was calculated, as well as the pulse duration and repetition rate. The results show that absorbers with higher modulation depths, i.e., graphene, deliver higher energy pulses at lower repetition rates. However, the pulse duration did not have a monotonic behavior and reaches a minimum for a given low value of the modulation depth typical of CNTs. PublicationOn the generality of measuring ultrabroad-band ultrashort laser pulses with the d-scan technique using ensembles of dielectric nano- and microparticles(Elsevier, 2023-07-27) Pérez Benito, Óscar; Cabrera Granado, Eduardo; García Martín, Susana; García González, Ester; Weigand, Rosa; Weigand Talavera, Rosa MaríaWe demonstrate that temporal characterization of ultrabroadband laser pulses (∼ 7 fs) through the d-scan technique can be implemented using ensembles of SHG micro and/or nanocrystals independently of their crystal size and/or composition. The experimental results have been supported by numerical simulations based on the Finite-Difference-Time-Domain (FDTD) algorithm. Both, experiment and simulations show that, in spite of the low optical quality of the samples and the unavoidable appearance of incoherent light, the technique is robust and allows to measure ultrashort laser pulses using clusters of randomly distributed and piled-up polar micro- and nanocrystals. PublicationGeneration of femtosecond paraxial beams with arbitrary spatial distribution(The Optical Society Of America, 2010-03-01) Martínez Matos, Óscar; Rodrigo Martín-Romo, José Augusto; Hernández Garay, María de la Paz; Izquierdo González, Jesús; Weigand Talavera, Rosa María; Calvo Padilla, María Luisa; Cheben, Pavel; Vaveliuk, Pablo; Bañares Morcillo, LuisWe present an approach to generate paraxial laser beams with arbitrary spatial distribution in the femtosecond time regime. The proposed technique is based upon a pair of volume phase holographic gratings working in parallel arrangement. It exploits the spatial coherence properties of the incoming laser beam in a compact and robust setup that mitigates angular and spatial chirp. The gratings were recorded in a photopolymerizable glass with a high optical damage threshold and a large optical throughput. Setup performance is studied and experimentally demonstrated by generating Laguerre-Gaussian femtosecond pulses.