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  • Title: Erbium-doped all-fiber laser at 2.94 microm.
    Author: Faucher D, Bernier M, Caron N, Vallée R.
    Journal: Opt Lett; 2009 Nov 01; 34(21):3313-5. PubMed ID: 19881578.
    Abstract:
    We report what we believe is the first demonstration of laser emission at 2.94 microm in an erbium-doped fluoride fiber laser. The low-loss all-fiber Fabry-Perot laser cavity was formed by two fiber Bragg gratings of 90% and 15% reflectivities in a 6.6 m, 7 mol.% Er-doped double-clad fiber. A maximum cw output power of 5.2 W was measured, which is to our knowledge the highest reported to date for a diode-pumped laser at this wavelength. A coreless endcap was fused at the output fiber end to prevent its deterioration at high output powers. Our results, including the slope efficiency of 26.6% with respect to launched pump power, suggest that erbium could be a better alternative than holmium in the search for a replacement for the flashlamp-pumped Er:YAG at 2.94 microm.
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