Efeitos dinâmicos em frequência para dois lasers semicondutores acoplados por injeção ortogonal mútua e filtrada.

Abstract

Semi conductor lasers are optical devices used in some field of researches, such as atomic physics and spectros copy, in technologic al applications for being optical devices very approach able if compared to others types of lasers. They are available in a great variety of wave length and they are at low cost. By being high gain and low cavity devices, diode lasers are very sensitive to optical refeeding, with its potency, frequency and phase changed. This property it is commonly used to modify the laser diode emission properties. Two types of optical refeeding are typically used: parallel and orthogonal refeeding. In case in which paralled refeeding is utilized, usually there is a variety of potency that is emitted by laser. In contrast, when the octagonal refeeding is utilized, in other word, when the light is reinjected in diode it has octagonal polarization, that of emission. The issued potency remains unchanged and occursalteration exclusivity in the emitted frequency. The group of Atomic Physics, and Lasers from UFPB (Universidade Federal da Paraíba) showed that using octagonal refeeding, spectrally filtered by atomics team is possible to reduce thew id thof laser line of the diode, and to obtain bestiality frequency for laser emission. The above results show no dynamics behavior. For the purpose of observing the dynamic behavior in frequency, as oscillations and chaos. We should increase the dimensionality of the system. To increase the dimensionality of the system we setup an experiment with two lasers coupled through mutual injection with orthogonal polarization. The beam soft he two lasers are engaged in an atomics team cellina configuration type absorption-saturated. We showed that with this configuration is possible to observe oscillations exclusively in frequency of lasers. In order to try understanding the origin of these fluctuations, we analyze how the transmission spectral filter to be injected on the opposited laser, depend son the frequencies ofthe two lasers, and which effects the frequency range of laser-induced refeeding.