Abstract
Wavelength tunable dysprosium-erbium (Dy3+/Er3+) co-doped ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) fiber lasers pumped at 980 nm were developed with a bulk grating blazed at 3.1µm in the Littrow configuration and their performances were investigated. A wavelength tunable range of 674.4 nm (2709.2 nm -3373.6 nm) was achieved with a 4.5-m 0.25 mol.% Dy3+/ 4mol.% Er3+ co-doped ZBLAN fiber. Our experiments demonstrated that either Er3+ or Dy3+ can be lasing individually in a Dy3+/Er3+ co-doped ZBLAN fiber and a fiber laser with wavelength tunable range from 2.7 µm to 3.4 µm or longer wavelengths can be achieved with proper fiber and cavity design.
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