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Three-transition cascade erbium laser at 1.7, 2.7, and 1.6 µm

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Abstract

We report on an upconversion cascade laser in an erbium-doped ZBLAN fiber emitting simultaneously on the three transitions S43/2I49/2 at 1.7 µm, I411/2I413/2 at 2.7 µm, and I413/2I415/2 at 1.6 µm. At moderate pump powers, the laser transition at 1.6 µm supports 2.7-µm lasing and permits a slope efficiency at 2.7 µm of 15% versus launched pump power. Above the threshold of upconversion lasing at 1.7 µm, the slope efficiency at 2.7 µm increases to 25.4%. Taking pump excited-state absorption into account, this value represents more than 90% of the theoretical slope efficiency. A transversely single-mode output power of 99 mW is achieved at 2.7 µm.

© 1997 Optical Society of America

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