Person:
Bañares Morcillo, Luis

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First Name
Luis
Last Name
Bañares Morcillo
URI
https://hdl.handle.net/20.500.14352/76133
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Física
Area
Química Física
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2010 - 20144
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    Holographic gratings implemented in a photopolymerizable glass: Application to femtosecond laser pulses shaping
    (22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011) Hernández Garay, María de la Paz; Martínez Matos, Óscar; González Izquierdo, Jesús; Calvo Padilla, María Luisa; Cheben, Pavel; Bañares Morcillo, Luis
    We present the capability of the holographic gratings implemented in photopolymerizable glasses to be applied in spatial and spectral manipulation of femtosecond laser pulses. For this purpose we used volume phase holographic gratings recorded by the interference of two monochromatic and coherent beams coming from a Nd-YAG continuous laser. We carried out experiments to determine the main features of the diffracted beams originated by the interaction of volume holographic phase grating structures with femtosecond pulses arising from the fundamental emission of an amplified Ti: sapphire laser system and its second harmonic. Meanwhile we have performed experiments to determine its damage threshold indicating that this material is an excellent candidate for intense-fields and ultrashort laser pulse applications.
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    Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses
    (Optics Express, 2011) Martínez Matos, Óscar; Hernández Garay, María de la Paz; González Izquierdo, Jesús; Calvo Padilla, María Luisa; Vaveliuk, Pablo; Cheben, Pavel; Bañares Morcillo, Luis
    The majority of the applications of ultrashort laser pulses require a control of its spectral bandwidth. In this paper we show the capability of volume phase holographic gratings recorded in photopolymerizable glasses for spectral pulse reshaping of ultrashort laser pulses originated in an Amplified Ti: Sapphire laser system and its second harmonic. Gratings with high laser induce damage threshold (LIDT) allowing wide spectral bandwidth operability satisfy these demands. We have performed LIDT testing in the photopolymerizable glass showing that the sample remains unaltered after more than 10 million pulses with 0,75 TW/cm^2 at 1 KHz repetition rate. Furthermore, it has been developed a theoretical model, as an extension of the Kogelnik's theory, providing key gratings design for bandwidth operability. The main features of the diffracted beams are in agreement with the model, showing that non-linear effects are negligible in this material up to the fluence threshold for laser induced damage. The high versatility of the grating design along with the excellent LIDT indicates that this material is a promising candidate for ultrashort laser pulses manipulations.
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    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, Luis
    We 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.
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    Femtosecond laser induced damage characterization of transmission volume phase gratings
    (Applied physics letters, 2014) Martínez Matos, Óscar; Hernández Garay, María de la Paz; Izquierdo, J. G.; Vaveliuk, Pablo; Bañares Morcillo, Luis; Calvo Padilla, María Luisa
    A procedure to characterize the induced damage and the incubation effects in volume transmission gratings under femtosecond laser pulse train illumination is presented. It was also developed a formalism that explains the damage processes. Our proposal was employed on glass gratings to show the effectiveness of the method and its potential to design transmission gratings with enhanced laser induced damage threshold. This procedure is able to be extended to any transmission grating composed by chemically non-uniform material, opening up new perspectives to femtosecond laser pulse shaping.