3 documents found, page 1 of 1
Cu(In,Ga)Se$$_2$$-based solar cells for space applications: Proton irradiation ...
Candeias, Maria B.; Fernandes, Tiago V.; Falcão, Bruno P.; Cunha, António F.; Cunha, José M. V.; Barbosa, João; Teixeira, Jennifer P.In this work, we present an experimental study of a Cu(In,Ga)Se2 (CIGS)-based solar cell (SC), irradiated with protons of energy 80 and 180 keV and with fuences of 1012 , 1013 , and 1014 cm−2 , as well as a strategy to recover the induced damage. The possible modifcations of the structural, electrical, and optical properties, induced by the proton irradiation, were investigated. Although the irradiation did not...
Auto-pulsação em lasers de semicondutor por bloqueio de modos e por injecção
Tavares, Pedro; Rocha, J. Ferreira da; Ribeiro, L. Botelho; Frazão, Orlando; Cunha, António F.This article describes two techniques for operating a semiconductor laser in a pulsed regime, namely the mode locking and injection locking mechanisms. For each one we present the operational principle, the theory and simulation results. We also describe the self Q-switching mechanism in multi-sections DFB lasers.; Este artigo descreve duas técnicas de operar um laser de semicondutor em regime pulsado, nom...
Extracção óptica de relógio para redes de elevado débito
Frazão, Orlando; Tavares, Pedro; Cunha, António F.; Ribeiro, L. Botelho; Rocha, J. Ferreira daThis article reports a modelling and experimental work on all-optical clock extraction for high bit-rate systems using self-pulsation mechanisms in semiconductor lasers at 1300 nm. External cavity DFB semiconductor lasers have been used, of both bulk and multiple quantum-well (MQW) types.; Este artigo descreve um trabalho de modelização e realização prática de um sistema de extracção de relógio totalm...