Person: Weigand Talavera, Rosa María
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First Name
Rosa María
Last Name
Weigand Talavera
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Óptica
Area
Optica
Identifiers
6 results
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Now showing 1 - 6 of 6
Item Dispersion-scan measurements of few-cycle pulses compressed with the multiplate continuum process(2017 Conference On Lasers and Electro-Optics Europe & European Quantum Electronics Conference (Cleo/Europe-Eqec), 2017) Canhota, Miguel; Weigand Talavera, Rosa María; Crespo, Helder M.Item On the Q-switched operation of Titanium: sapphire lasers using a graphene-based saturable absorber mirror(Optics and laser technology, 2015) 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.Item Optical transmission properties of Pentelic and Paros marble(Applied optics, 2015) 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.Item Inline self-diffraction dispersion-scan of over octave-spanning pulses in the single-cycle regime(Optics letters, 2017) 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.Item Q-switched operation with carbon-based saturable absorbers in a Nd:YLF Laser(Applied sciences, 2015) 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.Item Generation of femtosecond paraxial beams with arbitrary spatial distribution(Optics Letters, 2010) 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.