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Highly ytterbium-doped bismuth-oxide-based fibers were fabricated. The absorbance of a core glass was 2800 dB/m. Fiber lasers were also demonstrated using a 0.14-m of fiber, and a slope efficiency of 62% was obtained.
Real time NH/sub 3/ detection under H/sub 2/O vapor mixture with mid-IR light source at 3/spl mu/m based on difference frequency generation (DFG) was demonstrated. High spectral resolution measurements of NH/sub 3/ avoiding interference of water are reported.
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