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).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.