Abstract
The output power of the erbium fiber laser at 2.7 μm (4I11/2 → 4I13/2) is enhanced due to simultaneous laser action at 1.7 μm (4S3/2 → 4I13/2) and 1.6 μm (4I13/2 → 4I15/2) an Er3+-doped fluorozirconate fiber. The laser cascade overwhelms the saturation effect for the transition at 2,7 μm by suppressing the laser transition at 850 nm (4S3/2 → 4I13/2) with lasing at 1.7 μm |1|. The population of the level 4S3/2 occurs for pump wavelengths around 800 nm due to strong pump excited state absorption (ESA).
© 1996 IEEE
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