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The infrared (IR) fluorescence from Dy3+ doped Ga5Ge20Sb10S65 fibers is investigated in details in order to develop bright IR fiber sources emitting at 4.4 μm for CO2 sensing purposes. Optical sensing requires intense IR radiation to probe with accuracy gas concentrations by measuring the gas absorption. We developed a specific modeling describing the Dy3+ doped GeGaSbS fiber IR output power by simultaneously...
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