Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
Browse
Search Results
- Experimental characterization of vector Parabolic-Gauss beams(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-12) Ramírez Ríos, Diego Armando; Hernández Aranda. Raúl Ignacio; emipsanchez; Yepiz Escalante, Adad; Gutiérrez Vega, Julio César; School of Engineering and Sciences; Campus Monterrey; Pérez García Benjamín Jesús deThe theoretical and experimental study of optical beams that satisfy Helmholtz equation un der the paraxial regime is a relatively recent field in Optics and Photonics. Assuming quasi parallel propagation of a beam along a longitudinal axis, transversal planes of it can be mathe matically stated, which, embedded to a Gaussian apodization, are known as Helmholtz-Gauss (HzG) beams. Scalar orthogonal families of solutions of HzG beams such as Mathieu-Gauss, Bessel-Gauss, Parabolic-Gauss (PG), have been thoroughly studied trough numerical and ex perimental generation. Nonetheless, the Helmholtz equation admits vector solutions con structed from scalar HzG beams. Such vector HzG beams present electrical polarization dependent of the transversal locality, so that every point in the xy plane manifests its own polarization state. In this dissertation, motivated by the absence of report of experimental
- Analysis of mode competition in unstable optical resonators(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2010-05-01) Guizar Sicairos, Manuel; Guizar Sicairos, Manuel; 200201The dynamic coupled modes (DCM) method has been applied to study the transverse mode competition in optical resonators. In this work a differential equation for the homogeneously saturating dynamic gain is included in the original dynamic coupled modes method, thus increasing its physical resemblance and allowing the retrieval of gain temporal evolution at every point within the lasing medium. This new model provides a more realistic temporal evolution of the mode competition and gain saturation within the resonator, which can give further information of spatial coherence properties. The temporal information becomes particularly valuable when the laser transient is a matter of interest or when a continuous wave steady output is never reached, as occurs in pulsed lasers. The application of the method to a typical CO2 unstable confocal resonator is fully described, results and their connection to relevant physical properties of gas lasers, such as spiking and relaxation oscillations are discussed. The new general formulation does not assume that lasing medium fills the optical cavity and is suitable for modeling the dependence of small-signal gain and power gain on the transverse and longitudinal coordinates, thus providing a valuable tool for design of lasers with particular spatial coherence or mode discrimination requirements. Results of the numerical implementation of the DCM method with dynamic gain are in very good agreement with experimental measurements reported previously.
