ADRIANA RAMOS DE MIRANDA
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Artigo IPEN-doc 30193 Random lasers2023 - WETTER, NIKLAUS U.; VIEIRA, RENATO J.R.; SILVA, DANILO M. da; JORGE, KELLY C.; JIMENEZ-VILLAR, ERNESTO; GIEHL, JULIA M.; MIRANDA, ADRIANA R. de; DIPOLD, JESSICARandom lasers offer advantages such as low-cost fabrication and robustness in harsh environments and have applications in sensing, imaging, communications, and security. Our current research focuses on advanced materials, active control techniques, integration with other photonic structures, and exploration of Anderson localization and polydisperse effects. Coherent feedback in cavity-enhanced random lasers is discussed as means to achieve specific emission characteristics, and emission at 1300 nm is shown for the first time.Artigo IPEN-doc 25149 Dynamic random lasing in silica aerogel doped with rhodamine 6G2018 - WETTER, NIKLAUS U.; MIRANDA, ADRIANA R. de; PECORARO, EDISON; RIBEIRO, SIDNEY J.L.; JIMENEZ-VILLAR, ERNESTOSilica aerogel is a lightweight material, well known for its good mechanical and thermal characteristics, but its optical properties have received less attention, because it is weakly scattering. Here we present for the first time the lasing properties and their complex dynamics of silica aerogel doped with R6G. It is shown that the Q factors of the lasing modes determine the operation of the laser, being either resonant or ASE-lasing. For resonant lasing, the number of resonators is easily varied and the number of modes in a single resonator and their emission frequency can be dynamically adjusted, making this a truly versatile photonics material.