Depósito Digital de Documentos de la UAB Encontrados 23 registros  anterior11 - 20siguiente  ir al registro: La búsqueda tardó 0.01 segundos. 
11.
3 p, 290.0 KB Evaluation and correction of aberrations in an optical correlator by phase-shifting interferometry / Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Fisica) ; Moreno Soriano, Alfonso (Universitat Autònoma de Barcelona. Departament de Física) ; Nicolás Román, José (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We propose a new method for evaluating and correcting aberrations in a Vander Lugt correlator. The technique is achieved with liquid-crystal displays of the correlator and allows the task to be performed in situ. [...]
2003 - 10.1364/OL.28.001117
Optics letters, Vol. 28, No. 13 (1 July 2003) , p. 1117-1119  
12.
3 p, 453.7 KB Simple expressions for performance parameters of complex filters, with applications to super-Gaussian phase filters / Ledesma, Silvia (Universidad de Buenos Aires. Departamento de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
To study the three-dimensional (3-D) behavior produced by complex filters, we have extended the expressions for the axial and the transverse gain to the case in which the best image plane is not near the paraxial focus. [...]
2004 - 10.1364/OL.29.000932
Optics letters, Vol. 29, No. 9 (1 May 2004) , p. 932-934  
13.
3 p, 523.4 KB Programmable axial apodizing and hyperresolving amplitude filters with a liquid-crystal spatial light modulator / Davis, Jeffrey A. (San Diego State University. Department of Physics) ; Escalera Merino, Juan Carlos (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Márquez Ruiz, Andrés (Universitat Autònoma de Barcelona. Departament de Física) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física) ; Iemmi, Claudio (Universidad de Buenos Aires. Departamento de Fisica)
Amplitude-transmitting filters for apodizing and hyperresolving applications can be easily implemented by use of a two-dimensional programmable liquid-crystal spatial light modulator operating in a transmission-only mode. [...]
1999 - 10.1364/OL.24.000628
Optics letters, Vol. 24, No. 9 (1 May 1999) , p. 628-630  
14.
3 p, 481.8 KB Input-image homogenization as a method to improve a correlator's discrimination capability / Yaroslavsky, Leonid P. (Tel Aviv University. Department of Interdisciplinary Studies) ; López Coronado, Octavio (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We propose an input-image preprocessing method consisting of homogenization of the image to improve the discrimination capability of a correlation-based recognition process. This method is an approximation of the optimal filter. [...]
1998 - 10.1364/OL.23.001129
Optics letters, Vol. 23, No. 14 (15 July 1998) , p. 1129-1131  
15.
3 p, 547.6 KB Bidimensional planar micro-optics for optochemical absorbance sensing / Garcés, I. (Universidad de Zaragoza. Departamento Ingeniería Electrónica y Comunicaciones) ; Villuendas, F. (Universidad de Zaragoza. Departamento de Física Aplicada) ; Subías, J. (Universidad de Zaragoza. Departamento de Física Aplicada) ; Alonso Chamarro, Julián (Universitat Autònoma de Barcelona. Departament de Química) ; Valle Zafra, Manuel del (Universitat Autònoma de Barcelona. Departament de Química) ; Domínguez Horna, Carlos (Centro Nacional de Microelectrónica) ; Bartolomé Porcar, María Elena (Centro Nacional de Microelectrónica)
A new approach for developing optochemical absorbance sensors is presented. The method is based on a planar micro-optic circuit in which an optochemically active membrane that responds to selective compounds is deposited in the device, yielding a part of the guiding planar structure. [...]
1998 - 10.1364/OL.23.000225
Optics letters, Vol. 23, No. 3 (1 February 1998) , p. 225-227  
16.
3 p, 1.9 MB Detection theory approach to multichannel pattern location / Guillaume, M. (Ecole Nationale Supérieure de Physique de Marseille) ; Réfrégier, Ph. (Ecole Nationale Supérieure de Physique de Marseille) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Lashin, Vladimir (Universitat Autònoma de Barcelona. Departament de Física)
We propose and assess new algorithms for detecting and locating an object in multichannel images. These algorithms are optimal for additive Gaussian noise and maximize the likelihood of the observed images. [...]
1997 - 10.1364/OL.22.001887
Optics letters, Vol. 22, No. 24 (15 December 1997) , p. 1887-1889  
17.
3 p, 1016.2 KB Color pattern recognition with circular component whitening / Moreno Soriano, Ignacio (Universitat Autònoma de Barcelona. Departament de Física) ; Kober, Vitaly (Universitat Autònoma de Barcelona. Departament de Física) ; Lashin, Vladimir (Universitat Autònoma de Barcelona. Departament de Física) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física) ; Yaroslavsky, Leonid P. (Tel Aviv University. Department of Interdisciplinary Studies) ; Yzuel Giménez, María Josefa (Universitat Autònoma de Barcelona. Departament de Física)
Polychromatic object recognition based on circular whitening preprocessing of red–green–blue components and multichannel matched filtering is described. Computer simulations and experimental results are provided to facilitate recognizing a color target among objects of similar shape but with different color contents. [...]
1996 - 10.1364/OL.21.000498
Optics letters, Vol. 21, No. 7 (1 April 1996) , p. 498-500  
18.
3 p, 261.5 KB Second-harmonic generation in local modes of a truncated periodic structure / Trull Silvestre, Jose Francisco (Universitat Politècnica de Catalunya. Department de Física i Enginyeria Nuclear) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Vilaseca, Ramon (Universitat Politècnica de Catalunya. Department de Física i Enginyeria Nuclear) ; Martorell, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
We present an experimental study of the generation of second-harmonic light in a one-dimensional periodic structure truncated by the introduction of a defect in the central period. We observed an enhancement of the nonlinear interaction in the vicinity of the defect when the second-harmonic wave was excited for modes within the forbidden zone or stop band. [...]
1995 - 10.1364/OL.20.001746
Optics letters, Vol. 20, No. 17 (1 September 1995) , p. 1746-1748  
19.
3 p, 289.0 KB Full polarization chaos in a pump-polarization modulated isotropic cavity laser / Kul'minskii, A. (Universitat Politècnica de Catalunya. Department de Física i Enginyeria Nuclear) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Vilaseca, Ramon (Universitat Politècnica de Catalunya. Department de Física i Enginyeria Nuclear)
We study the dynamic behavior of an optically pumped J = 0 → J = 1 → J = 0 laser operating with an isotropic ring cavity and a linearly polarized pump field whose direction of polarization is modulated by the sinusoidal law θ(t) = m sin Ωt. [...]
1995 - 10.1364/OL.20.002390
Optics letters, Vol. 20, No. 23 (1 December 1995) , p. 2390-2392  
20.
3 p, 273.6 KB Derivation of weighting coefficients for multiplexed phase-diffractive elements / Carcolé, Eduard (Universitat Politècnica de Catalunya. Escola Universitària d'Òptica de Terrassa) ; Millán García-Varela, M. Sagrario (Universitat Politècnica de Catalunya. Escola Universitària d'Òptica de Terrassa) ; Campos Coloma, Juan (Universitat Autònoma de Barcelona. Departament de Física)
We mathematically analyze the phase-only hologram constructed by taking the phase corresponding to the linear combination of two weighted phase functions. We show that this phase-only hologram may be written as a new linear combination for the original phase functions with new weights. [...]
1995 - 10.1364/OL.20.002360
Optics letters, Vol. 20, No. 23 (1 December 1995) , p. 2360-2362  

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