INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
artículos
Título:
Distortions of Gaussian pulses transmitted through a transparent isotropic layer
Autor/es:
NATALIA C. ALVAREZ; MARÍA T. GAREA; EDUARDO ACOSTA; LILIANA I. PEREZ
Revista:
ELEKTRON
Editorial:
FACULTAD DE INGENIERIA- UNIVERSIDAD DE BUENOS AIRES
Referencias:
Lugar: CABA; Año: 2018 vol. 2 p. 67 - 70
ISSN:
2525-0159
Resumen:
Lasers can operate in two regimes: continuouswavemode or pulsed mode. In the simplest case, the formermode corresponds to monochromatic beams with Gaussiandistribution of amplitudes (beam limited in space); whereasthe latter mode corresponds to polychromatic beams withGaussian distribution of frequencies (pulse limited in time).When the pulsed beams are reflected and refracted in differenttypes of interfaces, they undergo peculiar distortions thatbear some parallelism with those found for beams limited inspace. These effects, as shown in a previous work, correspondto time delay (first order) and change of pulse width (secondorder). The distortions are clearly limited by the principle ofcausality and their interpretation, while not straightforward,emerges clearly when the associated fields are expressed inmagnitude and phase. Since the analytical expressions arenot simple even for the case where the pulse is transmittedthrough a single layer of linear, homogeneous, isotropic andtransparent material, it makes it difficult to solve the inverseproblem. In this work, we present an alternative analyticaldevelopment that makes it possible to explicitly determinethese distortion effects when a pulse impinges normallyon a transparent isotropic layer immersed in a medium ofanalogous characteristics.