Abstract
We report on an upconversion cascade laser in an erbium-doped ZBLAN fiber emitting simultaneously on the three transitions at 1.7 , at 2.7 , and at 1.6 . At moderate pump powers, the laser transition at 1.6 supports 2.7- lasing and permits a slope efficiency at 2.7 of 15% versus launched pump power. Above the threshold of upconversion lasing at 1.7 , the slope efficiency at 2.7 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 .
© 1997 Optical Society of America
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