Enhanced long-wavelength emission and 2109 nm lasing in Tm3+/Ho3+ co-doped germanate-core/silicate-cladding glass fiber.

Fiber lasers emitting beyond 2.1 μm remain attractive owing to their superior performance in molecular "fingerprint" gas sensing, supercontinuum generation, and advanced bioimaging applications. The Ho3+: 5I7→5I8 transition offers a larger emission c…

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