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The paper is a review on modelling and experimental results regarding microsphere resonators. The applications of the whispering-gallery-modes (WGMs) resonances in conventional glass microspheres to perform chemical spectroscopy, biomedical sensing, low threshold lasing are recalled. The behaviour of silica microsphere coated via silica hafnia 70SiO2-30HfO2 and activated with 0.3% mol Er3+ for NIR...
In this paper, the design of a lasing system constituted by a tapered fiber coupled to Er3+-doped microsphere and operating in Mid-IR wavelength range is numerically investigated. The device performance has been evaluated by means of a dedicated 3D numerical model based on the coupled mode theory and solving the rate equations. In particular, a detailed rate equations model including the main Er3+...
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