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Evaluation of High-Temperature Absorption Coefficients of Ionized Gas Plasmas in Optical Fibers

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1 Author(s)
Shuto, Y. ; Ofra Project, Iruma, Japan

The large absorption coefficient ?? of a fiber core at high temperatures is closely related to the generation of a fiber fuse. When silica glass is heated to a temperature above 4500 K, it forms Si+ and O+ ions and electrons in the ionized gas plasma state. We estimate the a value for the plasma in the fiber core at high temperatures, a begins to increase at 3500 K, then increases rapidly with increasing temperature above 4000 K, reaching a value of 1 ?? 107 m-1 at 6000 K. This value is about 300 times that necessary for initiating a fiber fuse.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 3 )