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In this study, the influences of cladding modes on double-cladding fiber (DCF) laser beam quality are discussed for the first time. Based on mode-coupling theory and beam propagation method, the formations of DCF cladding modes and mixed fields of guided modes and cladding modes are discussed and illustrated under the conditions of core misalignment in fiber fusion splice process. Further, the deterioration...
We report the design, fabrication, and demonstration of a chemical sensor-based on the spectral shift of organic microcavity lasers. The shape of the cavity contour is used as a parameter and is optimized to improve the sensitivity. Analytical and numerical predictions are in good agreement with experiments performed in a microfluidic environment, showing sensitivities of up to 100 nm per refractive...
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