A highly structured light pattern is observed when a coherent light beam is propagated by a multimode optical fiber and projected onto a screen. This pattern consists of a large number of small patches of bright light (English: speckle) on an opaque background, caused by the intermodal interference phenomenon. The speckle pattern varies slowly due to environmental factors surrounding the optical fiber, but the total intensity remains almost constant and can be registered by a single CCD camera. Any external perturbation (temperature, vibration, pressure, voltage, ...) performed on the fiber affects the speckle pattern. An appropriate image processing can allow extracting the causes of the disturbance source and build a correlation signal and its application to the extent of physical, chemical or biological. Generation occur speckle phenomenon in multimode optical fibers with a sou...

Un patrón de luz altamente estructurado es observado cuando un haz de luz coherente se propaga por una fibra óptica multimodo y es proyectada sobre una pantalla. Este patrón está constituido por una gran cantidad de pequeñas manchas de luz brillantes (del inglés: speckle) sobre un fondo opaco, producidos por un fenómeno de interferencia intermodal. El patrón de speckle varía lentamente debido a factores medio-ambientales que rodean a la fibra óptica, pero la intensidad total se mantiene casi constante y puede ser registrada por una simple cámara CCD. Cualquier perturbación exterior (temperatura, vibración, presión, tensión, …) realizada sobre la fibra afecta al patrón de speckle. Un adecuado procesado de las imágenes puede permitir extraer las causas del origen de la perturbación y construir una señal de correlación y su aplicación en la medida de parámetros físi...

 A highly structured light pattern is observed when a coherent light beam is propagated by a multimode optical fiber and projected onto a screen. This pattern consists of a large number of small patches of bright light (English: speckle) on an opaque background, caused by the intermodal interference phenomenon. The speckle pattern varies slowly due to environmental factors surrounding the optical fiber, but the total intensity remains almost constant and can be registered by a single CCD camera. Any external perturbation (temperature, vibration, pressure, voltage, ...) performed on the fiber affects the speckle pattern. An appropriate image processing can allow extracting the causes of the disturbance source and build a correlation signal and its application to the extent of physical, chemical or biological. Generation occur speckle phenomenon in multimode optical fibers with a sour...

In this work, we present the result of the application of Cadmium Sulfide Thin Film semiconductors as Planar Wave Guides. The experimental data of Wave Guide transversal transmission are complemented with spectral frontal transmission measurements to obtain a global explanationof this data As a secondary result of this analysis, we obrained finally the spectral dependence of the efective refraction index of CáS asa Thin Film material.

In this work we present the results of the photoacustical (PAS) characterization of thin film amorphous silicon (a-Si:H). The optical parameters (n,k) are obtained for semiconductive films, obtained by a reactive “DC glow discharge” process by spectral Transmission and absortion PAS measurements in a great spectral range and good agreement with previous evaluations .We determine finally the quasi gap energy (Tauc) and the band model of the semiconductor of a-Si:H.

In this work we present an automatic data acquisition system for the evaluation of optical guide modes. The system is applied to the characterization of a multimode guide, elaborated in the laboratory by the ionic interchange method.

En el presente trabajo se presenta un sistema automatizado por PC aplicado a la detección de modos de propagación en guías ópticas. El sistema se aplica al caso particular de una guía multimodo de vidrio, elaborada por el método de intercambio iónico de plata

In this work we present an automatic data acquisition system for the evaluation of optical guide modes. The system is applied to the characterization of a multimode guide, elaborated in the laboratory by the ionic interchange method.

En esta publicación presentamos los primeros resultados obtenidos en la UNI, en la técnica de elaboración y caracterización de guías ópticas. Este trabajo se inició en el marco de un curso teórico experimental dictado por el Prof. Mauro Lomer en Agosto 98. Se presenta la teoría básica, los Métodos de elaboración empleados, el proceso de caracterización empleado y los resultados.

In this paper, we show the first results obtained in the UNI, about the technology of elaboration and characterization of optical guides. This Work was initiated in August 98, in relation to a Workshop organized in our Lab by Prof. Mauro Lomer. We present here the basic theory, the applied elaboration Methods, the characterization process and results.