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Autor Calvo Padilla, María Luisa |
Documentos disponibles escritos por este autor (133)
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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 | The Optical Society Of America | 2010-03-01We 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 expl[...]![]()
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Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | The Optical Society Of America | 2007-03-05In this work we formulate the main properties of the gyrator operation which produces a rotation in the twisting (position-spatial frequency) phase planes. This transform can be easily performed in paraxial optics that underlines its possible ap[...]![]()
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This paper presents a high efficiency holographic coupler design for telecommunication purposes. It is based on the eikonal approach to diffracted field analysis and on the coupled wave analysis for gaussian beam in generalized coordinate.![]()
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Florja?czyk, Miroslaw ; Villafranca Velasco, Aitor ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Bock, Przemek J. ; Delâge, André ; Schmid, Jens H. ; Lapointe, Jean ; Janz, Siegfried ; Xu, Dan-Xia ; Vachon, Martin | IEEE-Inst Electrical Electronics Engineers Inc. | 2013We report a spatial heterodyne Fourier-transform spectrometer consisting of an array of Mach-Zehnder interferometers (MZI) implemented in silicon microphotonics. Optical path differences between the MZI arms increase linearly along the array, ge[...]![]()
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Villafranca Velasco, Aitor ; Cheben, Pavel ; Bock, Przemek J. ; Schmid, Jens H. ; Delâge, André ; Lapointe, Jean ; Janz, Siegfried ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Florja?czyk, Miros?aw ; Vachon, Martin | The Optical Society Of America | 2013-03-01We report a stationary Fourier-transform spectrometer chip implemented in silicon microphotonic waveguides. The device comprises an array of 32 Mach-Zehnder interferometers (MZIs) with linearly increasing optical path delays between the MZI arms[...]![]()
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Based on a previous model describing the behavior of a holocoupler/fiber optic device, we develop a new model for a holocoupler/GRIN lens system and analyze the conditions for the coupling to hold and the requirements of the coupled signal![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1989The interconnection problems in the use of optical fibers for signal transmission is a very active area of research involving several fields such as optical communication techniques and holography. Various authors have studied the efficiency of [...]![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | The Optical Society Of America | 1989-06-01A mathematical model for describing a holographic coupler–optical fiber system is considered. The object wave to be recorded in the hologram is assumed to be a polarized wave which is scattered by the optical fiber. In the reconstruction the opt[...]![]()
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Martínez Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Vaveliuk, Pablo ; Calvo Padilla, María Luisa | Optical Society of America | 2011-02-15We propose a spectrum analyzer based on the properties of a hologram recorded with the field transmitted by a Fabry-Perot etalon. The spectral response of this holographic Fabry-Perot spectrometer (HFPS) is analytically investigated in the parax[...]![]()
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Hernández Garay, María de la Paz ; Martínez Matos, Óscar ; González Izquierdo, Jesús ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Bañares Morcillo, Luis | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2011We 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 b[...]![]()
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Guibelalde del Castillo, Eduardo ; Calvo Padilla, María Luisa | Butterworth - Heinemann Ltd. | 1988-06The transition from the Raman-Nath to a Bragg regime for holographic grating diffracted fields is studied using a new integral equation and Fourier transform techniques. Analytical and numerical studies are presented and evaluated.![]()
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Calvo Padilla, María Luisa ; Alieva, Tatiana Krasheninnikova | Maik Nauka, Interperiodica, Springer-Verlag | 2003-07Image reconstruction from amplitude-only and phase-only data in the fractional Fourier domain applying the inverse fractional Fourier transform is analyzed on the examples of perfect edges of different contrasts and real-world image.![]()
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The importance of the amplitude and phase in the fractional Fourier transform (FT) domain is analyzed on the basis of the rectangular signal and the real-world image. The quality of signal restoration from only the amplitude or from only the pha[...]![]()
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The spatial impulse response of a single variable-cross-section photoreceptor has been characterized assuming the incoming radiation to be an initial field propagating under confinement conditions inside the receptor. By application of Fourier a[...]![]()
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Carreras Béjar, Carmen ; Calvo Padilla, María Luisa ; Chevalier del Río, Margarita | SPIE--The International Society for Optical Engineering. | 1985In preceding works, a theoretical model has been introduced for the transmission function of a biological cell, in which the physical effects of the three transmission functions for the cytoplasm, the nucleus and the cellular membrane have been [...]![]()
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We consider a general class of inhomogeneous dielectric slabs, where the dielectric permittivity (l) is assumed to depend on the frequency (y) at each position, through the Kramers-Krönig dispersion relation. The physical basis for this assumpti[...]![]()
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We study monomode slab and cylindrical waveguides, in which the dielectric permittivity l has both a graded spatial variation and finite discontinuities at the boundaries. New integral equations for the H-type propagation mode in the slab and fo[...]![]()
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An exact formulation of the electromagnetic field striking an optical waveguide is presented and compared with the decomposition relationship used in the literature. The expression for the critical angle is derived as a natural consequence of th[...]![]()
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We present here numerical estimates of the density and flux of energy based on physical parameters associated with the absorption properties of certain types of absorbing optical waveguides. These results are based on a theoretical formalism est[...]![]()
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Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | American Institute of Physics (AIP) | 2007We introduce the gyrator transform which produces a rotation of two-dimensional signal in phase space. Main properties of this transform are considered. The flexible optical set up for gyrator transform experimental implementation is discussed. [...]![]()
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We apply techniques of optimal-control theory, namely, the methods of dynamic programming, to the problem of light propagation in optical waveguides. This formulation is equivalent to the resolution of an eikonal equation. We illustrate this opt[...]![]()
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Calvo Padilla, María Luisa ; Enoch, Jay M. ; Lakshminarayanan, Vasudevan ; Limeres, J. | The Optical Society Of America | 2003-07We develop a computational method for calculating the spatial profile of the electromagnetic field after scattering by an array of waveguides. Our formalism is very general and includes chromatic dependence, the influence of the array arrangemen[...]![]()
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Manzanares Ituarte, Ana ; Calvo Padilla, María Luisa ; Chevalier del Río, Margarita ; Lakshminarayanan, Vasudevan | The Optical Society Of America | 1997-07-01A revised formulation of the image Light distribution of an incoherent line source proposed by Steel [Rev. Opt. 31, 334-340 (1952)] is presented. Analytical and numerical results based on this new representation are given. We explicitly show tha[...]![]()
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Since the last decades, cell phones have become increasingly popular and are nowadays ubiquitous. New generations of cell phones are now equipped with text messaging, internet, and camera features. They are now making their way into the classroo[...]