M. Poirier et al., DYNAMIC AND ORIENTATIONAL BEHAVIOR OF UV-INDUCED LUMINESCENCE BLEACHING IN GE-DOPED SILICA OPTICAL-FIBER, Optics letters, 18(11), 1993, pp. 870-872
We report two experiments on UV light-induced bleaching of the 400-nm
luminescence associated with the 240-nm absorption band in Ge-doped op
tical fiber. We have measured the dynamics of the bleaching for differ
ent UV intensities and show that it is well fitted by a stretched expo
nential function, which indicates a site-dependent bleaching rate. We
have also shown that the bleaching is anisotropic, confirming a model
in which the defects having a dipole moment aligned with the UV light
polarization are preferentially excited and bleached.