Abstract
Pumping of thulium-doped fluorozirconate fibre lasers at wavelengths available from semiconductor diodes around 790 nm has enabled continuous wave laser operation at 806 nm, 1.47 μm, 1.97 μm and 2.3 μm, many of which may occur simultaneously. The performance of these laser transitions, including diode-pumped operation of the 3H 4- 3H 6 transition at 1.97 μm, is discussed.
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