9 June 2014 Resonant tandem pumping of Tm-doped fiber lasers
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We have demonstrated efficient lasing of a Tm-doped fiber when pumped with another Tm-doped fiber. In these experiments, we use a 1908 nm Tm-doped fiber laser as a pump source for another Tm-doped fiber laser, operating at a slightly longer wavelength (~2000 nm). Pumping in the 1900 nm region allows for very high optical efficiencies, low heat generation, and significant power scaling potential due to the use of fiber laser pumping. The trade-off is that the ground-state pump absorption at 1908 nm is ~37 times lower than at 795nm. However, the absorption cross-section is still sufficiently high enough to achieve effective pump absorption without exceedingly long fiber lengths. This may also be advantageous for distributing the thermal load in higher power applications.
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Daniel Creeden, Daniel Creeden, Benjamin R. Johnson, Benjamin R. Johnson, Glen A. Rines, Glen A. Rines, Scott D. Setzler, Scott D. Setzler, "Resonant tandem pumping of Tm-doped fiber lasers ", Proc. SPIE 9081, Laser Technology for Defense and Security X, 90810I (9 June 2014); doi: 10.1117/12.2053329; https://doi.org/10.1117/12.2053329

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