Abstract

We present a spectroscopic study of the green fluorescence resulting from pump excited-state absorption in Er-doped silica fibers excited in the 800-nm range. The absorption and emission bands are selectively attributed to the ⁴S_3/2 and ²H_11/2 levels. The fluorescence response at two excitation wavelengths, the temperature behavior, and lifetime measurements demonstrate a fast thermalization between the ⁴S_3/2 and ²H_11/2 levels. This explains an important part of the ²H_11/2 emission and the increase of the fluorescence intensity at high temperature.

© 1994 Optical Society of America

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