Abstract

The development of rare-earth-doped single-mode optical fibers based on silica for the use in diode-pumped fiber lasers with a high cw-output power demands the investigation of the local distribution of the rare-earth component in the fiber core. Hence, we developed a novel, nondestructive measurement method for the determination of the local distribution of the fluorescence of the rare earth-doped preform. Such measurements allow to draw conclusions to the concentration distribution of the rare-earth component in the preform.

© 1994 IEEE