18 November 2014 Fiber laser at 2 μm for soft tissue surgery
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Strong water absorption at 2 μm generated recent interest in lasers at this wavelength for soft tissue surgery. A fiber Bragg grating-based, all-fiber, continuous-wave, cladding pumped, thulium-doped fiber laser at 1.95 μm is configured. The thulium-doped active fiber with octagonal-shaped inner cladding is pumped at 808 nm (total power of 17 W) with six laser diodes through a combiner. The laser power of 3.3 W (after elimination of unabsorbed pump power through a passive fiber) with slope efficiency of 23% (against launched pump power) is achieved. The linear variation of laser power with pump offers scope of further power scaling.
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Aditi Ghosh, Aditi Ghosh, Debasis Pal, Debasis Pal, Ranjan Sen, Ranjan Sen, Atasi Pal, Atasi Pal, "Fiber laser at 2 μm for soft tissue surgery", Proc. SPIE 9266, High-Power Lasers and Applications VII, 92660E (18 November 2014); doi: 10.1117/12.2071817; https://doi.org/10.1117/12.2071817

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