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2 July 1998 Pump distribution effects on photon avalanche in fiber lasers
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Proceedings Volume 3405, ROMOPTO '97: Fifth Conference on Optics; (1998)
Event: ROMOPTO '97: Fifth Conference on Optics, 1997, Bucharest, Romania
The paper discusses the effect of pump intensity variations caused by absorption in a fiber system with upconversion avalanche fluorescence or laser emission. The numerical modeling shows that in given pump conditions the initial part of the fiber (up to a distance zth) is pumped above the avalanche threshold while the remaining part lies below it. This induces a strong variation of populations of the excited levels along the fiber. The characteristics of the avalanche emission are connected to the spectroscopic parameters of the system and to the conditions of pump. It is also shown that the features of the global luminescence emission at the end of fiber depend strongly on the fiber length for the short fibers (L <EQ zth) but for the long ones this dependence diminishes; thus the avalanche emission of a long fiber could be different from that predicted by a constant rate modeling. The effect of distribution of local pump intensities on laser emission in avalanche-driven upconversion fiber lasers is also discussed.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Voicu Lupei and Eugen Osiac "Pump distribution effects on photon avalanche in fiber lasers", Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998);

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