D. Yu et al., CHANGES IN SPATIAL-DISTRIBUTION OF UV-EXCITED LUMINESCENCE IN GE-DOPED FIBER PREFORMS DURING UV EXPOSURE, Electronics Letters, 29(22), 1993, pp. 1975-1977
The spatial distribution of the blue luminescence associated with the
240nn, absorption band, measured in Ge-doped optical fibre preforms us
ing a wide range of 266nm excitation power, is presented. The distribu
tion was found to change during the UV exposure, implying a dependence
of the absorption band bleaching on the Ge concentration.