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Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Servín Guirado, Manuel | The Optical Society Of America | 2008-07-20We present a spatial adaptive asynchronous algorithm for fringe pattern demodulation. The proposed algorithm is based on the standard five-step asynchronous method with the one modification that we select the best sample spacing for each point o[...]texto impreso
Álvarez Herrero, Alberto ; López Heredero, Raquel ; Levy, David ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2001-02-01The variation of the optical properties of porous Vycor glass (Corning, Model 7930) under different relative-humidity conditions was studied. The adsorption of water into the glass pores was investigated with spectroscopic ellipsometry. The chan[...]texto impreso
Álvarez Herrero, Alberto ; Guerrero Padrón, Héctor ; Levy, David ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-11-01An optical method to determine the nanostructure and the morphology of porous thin films is presented. This procedure is based on the response of a side-polished optical fiber with the film under study, when an adsorption-desorption cycle is car[...]texto impreso
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Rico-García, José María ; Sánchez Brea, Luis Miguel ; Alda, Javier | The Optical Society Of America | 2008-02-20A tomographiclike method based on the inverse radon transform is used to retrieve the irradiance map of a focused laser beam. The results obtained from multiple knife-edge measurements have been processed through a kriging technique. This techni[...]texto impreso
Quiroga Mellado, Juan Antonio ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1998-09-01An algorithm for accurately extracting the local fringe direction is presented. The algorithm estimates, in the neighborhood of n × n points, the direction of the gradient that points normal to the local fringe direction. The performance of four[...]texto impreso
Serna Galán, Julio ; Martínez Herrero, Rosario ; Mejías Arias, Pedro Miguel | The Optical Society Of America | 1993-03-01The beam quality behavior of Hermite-Gauss laser modes propagating through Gaussian apertures is analyzed.texto impreso
Martínez Matos, Óscar ; Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Cámara, Alejandro ; Cheben, Pavel ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-03-28In this work, we propose a robust and versatile approach for the characterization of the complex field amplitude of holographically generated coherent-scalar paraxial beams. For this purpose we apply an iterative algorithm that allows recovering[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Salgado Remacha, Francisco Javier ; Morlanes Calvo, Tomás ; Jiménez Castillo, Isidoro ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2010-06-10We present a collimation technique based on a double grating system to locate with high accuracy an emitter in the focal plane of a lens. Talbot self-images are projected onto the second grating producing moiré interferences. By means of two pho[...]texto impreso
Quiroga Mellado, Juan Antonio ; Alonso Fernández, José ; Zoido, J. ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1994-09-10Least-squares approximation can be used in image-based colorimetry once the set of sampling functions is selected. We discuss the accuracy obtained in earlier research, and we compare it with a better calculation method.texto impreso
Bouchard, Frédéric ; Koutný, Dominik ; Hufnagel, Felix ; Hradil, Zdenek ; Rehácek, Jaroslav ; Yong-Siah, Teo ; Ahn, Daekun ; Jeong, Hyunseok ; Sánchez Soto, Luis Lorenzo ; Leuchs, Gerd ; Karimi, Ebrahim | The Optical Society Of America | 2019-06-24The ability to completely characterize the state of a system is an essential element for the emerging quantum technologies. Here, we present a compressed-sensing-inspired method to ascertain any rank-deficient qudit state, which we experimentall[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2009-10-20We analyze the Talbot effect produced by a mask composed of two diffraction gratings. Combinations with phase and amplitude gratings have been studied in the near-field regime. For a two-phase-gratings configuration, the Talbot effect is cancele[...]texto impreso
We show how to decouple a coherent Gaussian beam having general astigmatism (to transform it into a beam having only simple astigmatism, or orthogonal symmetry) by using a single rotated thin cylindrical lens. The resulting coherent orthogonal G[...]texto impreso
Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Alonso Fernández, José ; Vargas, Javier | The Optical Society Of America | 2010-09-20This paper presents a deflectometric technique to measure the power of an ophthalmic lens as perceived by the user. It is based on a calibrated camera acting as a pinhole in order to measure ray deflection along the same path as the visual axis [...]texto impreso
Bock, Przemek J. ; Cheben, Pavel ; Schmid, Jens H. ; Villafranca Velasco, Aitor ; Delâge, André ; Janz, Siegfried ; Xu, Dan-Xia ; Lapointe, Jean ; Hall, Trevor J. ; Calvo Padilla, María Luisa | The Optical Society Of America | 2012-08-27We experimentally demonstrate a new type of waveguide multiplexer device designed for silicon photonics, with a crosstalk level as low as -35 dB and an operational wavelength range of 300 nm. A compact device footprint of only 100 x 160 µm2 offe[...]
