22 December 1993 Measurement and interpretation of fluorescence-like emissions in silica-based optical fibers
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A kind of fluorescence around 800 - 950 nm, 620 - 650 nm, 440 - 450 nm and 390 - 420 nm has been achieved in silica-based optical fibers by high power pumping at 1.06 or 0.532 micrometers . We show that it is non-dependent on the index profile but on the doping. The first and the fourth emissions arise from a reduced germanium defect. The second and the third ones are from the silica network. Life-time measurements performed with a streak-camera show that all emissions have the same time behavior as the pump. Adding the observation that these lines are often accompanied by conjugated lines through Four Photon Mixing, we suggest for blue and visible lines, a combined nonlinear process: the Four Photon Mixing Stimulated Fluorescence. We point out that there can be other fluorescence induced nonlinear processes like with stimulated Raman scattering or second harmonic generation.
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Bertrand Poumellec, Herve A. Fevrier, "Measurement and interpretation of fluorescence-like emissions in silica-based optical fibers", Proc. SPIE 2044, Photosensitivity and Self-Organization in Optical Fibers and Waveguides, (22 December 1993); doi: 10.1117/12.165650; https://doi.org/10.1117/12.165650

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