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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[...]
