Person:
Melle Hernández, Sonia

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First Name
Sonia
Last Name
Melle Hernández
URI
https://hdl.handle.net/20.500.14352/79895
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Óptica
Area
Optica
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2006 - 200922010 - 20143
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Now showing 1 - 5 of 5
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    Evolution of the Correlation between Orthogonal Polarization Patterns in Broad-Area Lasers
    (Physical review letters, 2006) Cabrera Granado, Eduardo; Melle Hernández, Sonia; Gómez Calderón, Óscar; Guerra Pérez, José Manuel
    We measure polarization-resolved instantaneous patterns in a large-aspect ratio quasi-isotropic Nd:YAG laser. High correlation between the instantaneous orthogonal polarization patterns recorded at the earlier stages of the laser pulse has been found due to the strong cross saturation between both polarization modes.
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    Dynamic transition from modelike patterns to turbulentlike patterns in a broad-area Nd:YAG laser
    (Optics letters, 2006) Cabrera Granado, Eduardo; Melle Hernández, Sonia; Gómez Calderón, Óscar; Guerra Pérez, José Manuel
    We report the first experimental observation to our knowledge of a dynamic transition from modelike patterns to completely disordered patterns in a large-aspect-ratio Nd:YAG laser. Recordings of near-field patterns with an integration time as small as 1 ns allow us to follow the evolution of the transverse intensity profile along the output pulse of the laser.
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    Líneas de investigación del Grupo UCM de Física del Láser, Óptica Cuántica y Óptica No Lineal
    (Óptica Pura y Aplicada, 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 María
    En 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.
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    Plasmonic effects in excitonic population transfer in a driven semiconductor–metal nanoparticle hybrid system
    (Physical review B, 2012) Antón Revilla, Miguel Ángel; Carreño Sánchez, Fernando; Melle Hernández, Sonia; Calderón, Oscar Gómez; Cabrera Granado, Eduardo; Cox, Joel; Singh, Mahi R.
    We have investigated the coherent transfer of excitonic populations in a semiconductor quantum dot (SQD) modulated by the surface plasmon of a metallic nanoparticle (MNP). The SQD is considered as a three-level V-type atomic system. We applied a transform-limited laser pulse field resonant with the upper atomic levels of the SQD. When the SQD is close enough to the MNP, the otherwise equally populated atomic levels can be selectively excited. Selectivity population can be achieved by two physical mechanisms: an enhancement of the Rabi frequencies that drive the optical transitions, which depends on the polarization arrangement, and a frequency shift of the optical transitions that leads to a dynamical detuning.
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    Phase shift of amplitude-modulated optical signals in graphene oxide water dispersions due to thermal lens focal length oscillation
    (Journal of the Optical Society of America B, 2014) Melle Hernández, Sonia; Gómez Calderón, Óscar; Egatz-Gómez, Ana; Cabrera Granado, Eduardo; Carreño Sánchez, Fernando; Salavagione, H. J.; Antón Revilla, Miguel Ángel
    We analyze the phase shift induced in an amplitude-modulated laser beam propagating through a water dispersion of graphene oxide sheets in a fiber-to-fiber U-bench. This phase shift arises from the thermally induced nonlinear refraction in the sample. The system exhibits strong optical limiting performance for weak continuous-wave signals. A theoretical model including beam propagation and thermal lens focal length oscillation reproduces the experimental findings.