Información del autor
Autor Torcal Milla, Francisco José |
Documentos disponibles escritos por este autor (28)
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
Highly collimated beams are required in numerous applications and techniques. Different methods have been proposed for collimating monochromatic point light sources during the recent years. In this work, we analyze how a finite size and polychro[...]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
In this work, we obtain analytical expressions for the near-and far-field diffraction of random Ronchi diffraction gratings where the slits of the grating are randomly displaced around their periodical positions. We theoretically show that the e[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2008-11-24We analyze the far field and near field diffraction pattern produced by an amplitude grating whose strips present rough edges. Due to the stochastic nature of the edges a statistical approach is performed. The grating with rough edges is not pur[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2008-12-01Steel tape gratings are used in different metrology applications. As the period of these gratings was large (around 100?m,), its analytical study has been performed, up to date, using a geometrical approach. Nowadays, steel tape gratings can be [...]texto impreso
Herrera Fernández, José María ; Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Morlanes Calvo, Tomás ; Bernabeu Martínez, Eusebio | IOP Publishing | 2016-06-14We propose an accurate technique for obtaining highly collimated beams, which also allows testing the collimation degree of a beam. It is based on comparing the period of two different self-images produced by a single diffraction grating. In thi[...]texto impreso
Martínez Matos, Óscar ; Alieva Krasheninnikova, Tatiana ; Canabal Boutureira, Héctor ; Navarrete Fernández, María de la Cruz ; Gonzalo Fonrodona, Isabel ; Herrera Fernández, José María ; Irigoyen Irigoyen, Maite ; Luis Aina, Alfredo ; Piquero Sanz, Gemma ; Rodrigo Martín Romo, José Augusto ; Sánchez Brea, Luis Miguel ; Sánchez Martín, José Antonio ; Serna Galán, Julio ; Tercero Gómez, José Luis ; Torcal Milla, Francisco José ; Vilas Prieto, José Luis ; Weigand Talavera, Rosa | 2015Se propone un cambio en la metodología docente de la asignatura Laboratorio de Física III del Grado en Física, para hacerla más dinámica y potenciar la participación e iniciativas de los estudiantes, adecuándola al espíritu de Boloniatexto impreso
We investigate the far field diffraction process produced by diffraction gratings with two roughness levels, such as steel tape gratings, which are used in environments where diffraction gratings made of glass are not possible. We obtain the ana[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2008-04In this work, we analyze the far-field pattern produced by a grating made of strips with two different random roughness levels. The efficiency and shape of the diffraction orders is obtained, which are shown to depend on the statistical properti[...]texto impreso
Jofre, Marc ; Gardelein, Arnaud ; Anzolin, Gabriele ; Amaya, Waldimar ; Capmany Francoy, José ; Ursin, Rupert ; Peñate Quesada, Laura ; López Molina, Demetrio ; San Juan, J. L. ; Carrasco, José Antonio ; García de Quirós, Francisco ; Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio ; Perdigues Armengol, Josep Maria ; Jennewein, Thomas ; Pérez Torres, Juan ; Mitchell, Morgan W. ; Pruneri, Valerio | The Optical Society Of America | 2011-02-28A novel integrated optical source capable of emitting faint pulses with different polarization states and with different intensity levels at 100 MHz has been developed. The source relies on a single laser diode followed by four semiconductor opt[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Herrera Fernández, José María | Elsevier | 2015-09-01An accurate collimation technique based on a double grating system is proposed. Transversal displacement of the grating is not required and then, automatic single-frame processing can be performed. Talbot self-images are projected onto a mask co[...]texto impreso
An accurate and simple technique for determining the focal length of a lens is presented. It consists of measuring the period of the fringes produced by a diffraction grating at the near field when it is illuminated with a beam focused by the un[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Morlanes Calvo, Tomás | Optical Society of America | 2016-09-09In this Letter, we analyze the near-field diffraction pattern produced by chirped gratings. An intuitive analytical interpretation of the generated diffraction orders is proposed. Several interesting properties of the near-field diffraction patt[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | IOP Publishing | 2015We analyze the field produced by a cylindrical convex diffraction grating at the Fresnel regime for several kinds of light sources, including a monochromatic quasipunctual source, finite size, and polychromatic sources. These results can help on[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2013We obtain a general analytical formulation for determining the near field produced by N diffraction gratings disposed in stack using a scalar approximation. Parameters of the gratings such as type-amplitude/phase-, fill factors, periods and rela[...]texto impreso
Cuadrado Conde, Alexander ; Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio | OSA Publishing | 2019-05-01We present in this work a numerical model for characterizing the scattering properties of the human lens. After analyzing the scattering properties of two main scattering particles actually described in the literature through FEM (finite element[...]texto impreso
Cuadrado, Alexander ; Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Quiroga, Juan Antonio ; Gómez Pedrero, José Antonio | Optical Society of America | 2019-05-01We present in this work a numerical model for characterizing the scattering properties of the human lens. After analyzing the scattering properties of two main scattering particles actually described in the literature through FEM (finite element[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Hoyo Muñoz, Jesús del ; Cuadrado Conde, Alexander ; Gómez Pedrero, José Antonio | IOP Publishing, Ltd. | 2020-04-02Conventional refractive lenses concentrate the incident light at focal distance. A narrow beam waist can be achieved by increasing the lens numerical aperture, but strongly reduces the depth of focus. In this paper, we explore diffractive lenses[...]texto impreso
Torcal Milla, Francisco José | Universidad Complutense de Madrid, Servicio de Publicaciones | 2009-07-09In this Thesis work we present theoretical, numerical and experimental analyses of the behavior of non-perfect diffraction gratings. We have permormed an analyses of diffraction gratings engraved on a steel tape. This kind of gratings can be fou[...]texto impreso
We analyze the self-imaging process produced by a transmission grating whose strips present two different roughness levels. This kind of grating periodically modulates the transmitted light owing only to the different microtopographic properties[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Herrera Fernández, José María ; Morlanes, Tomás ; Bernabeu Martínez, Eusebio | Optical Society of America | 2014A simple collimation technique based on measuring the period of one self-image produced by a diffraction grating is proposed. Transversal displacement of the grating is not required, and then automatic single-frame processing can be performed. T[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Salgado Remacha, Francisco Javier ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2010-10-15We analyze the near field behavior of binary amplitude gratings which present a curved profile. This configuration has an important application in rotary optical encoders. This kind of encoders is used to measure the angular displacement between[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2007-10-01Metallic gratings can be found in applications such as optical metrology. Due to their fabrication process, the surface presents a certain roughness. In this work, the effect of roughness on Talbot effect has been analyzed when the grating is il[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The International Society for Optical Engineering (SPIE) | 2009Diffraction gratings are one of the most used elements in optics and even in other fields of science. They are used also like part of measurement devices in scientific and industrial applications. As it is well known, self-imaging effect appears[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2007-06-20The Talbot effect is analyzed when steel tape gratings are used. These gratings are made on a steel substrate, and, because of the manufacture process, both levels of the grating are rough with different roughness parameters. A theoretical analy[...]texto impreso
Salgado Remacha, Francisco Javier ; Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Elsevier Sci. Ltd. | 2011-03Steel tape is used in optical applications due to its mechanical properties. However, roughness of steel surfaces affects to wave propagation. The effect can be observed using diffraction gratings with low periods. In such a case, self-images of[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2007-08-01We present a technique for determining the contrast of an intensity distribution in the presence of additive noise and other effects, such as undesired local amplitude or offset variations. The method is based on the variogram function. It just [...]