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11 March 2016 Comparison of in-band pumped Tm:fiber and Ho:fiber
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Thulium and holmium have become the rare earth dopants of choice for generating 2 micron laser light in silica fiber. The majority of Tm:fiber lasers are pumped with high power diodes at 790nm and rely upon cross-relaxation processes to achieve optical-to-optical efficiencies of 55-65%. Tm:fiber lasers can also be pumped at <1900nm by another Tm:fiber laser to minimize quantum defect, reaching efficiencies >90%. Ho:fiber lasers are similarly pumped by Tm:fiber lasers at 1900-1950nm, with <70% typical efficiency. In this work, Tm:fiber and Ho:fiber lasers are in-band pumped using the same experimental setup to directly compare their performance as 2 micron sources.
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Alex Sincore, Lawrence Shah, Vadim Smirnov, and Martin Richardson "Comparison of in-band pumped Tm:fiber and Ho:fiber", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97280S (11 March 2016);

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