The article investigates diode pump absorption and temperature distribution in three erbium-doped double-clad fluoride fibers. Absorption was measured via fluorescence intensity and temperature distribution was measured with thermal imaging. The measurements we supported by theoretical calculations. Results indicate that erbium-doped fluoride fiber lasers have already reached maximum output powers allowed under natural convection cooling. Fiber design and cooling optimization is proposed, that would allow an order-of-magnitude further power-scaling.
COBISS.SI-ID: 2205540