Bleaching of optical activity induced by UV Laser exposure in natural silica

Details Bleaching of optical activity induced by UV Laser exposure in natural silica Bleaching of optical activity induced by UV Laser exposure in natural silica

2004-10-22

arxiv.org/abs/cond-mat/0410585v1

J. Non-Cryst. Solids 345, 2004, 433

Physics

Condensed Matter

Materials Science

Accepted for publication on Journal of Non crystalline solids

Scientific paper

10.1016/j.jnoncrysol.2004.08.058

We report experimental data on two types of natural silica, differing for their OH content, irradiated with UV photons (4.66 eV) from a pulsed Nd:YAG laser. Irradiation induces a reduction of the absorption band at 5.12eV and of the associated emissions at 3.14eV and 4.28eV, ascribed to twofold coordinated Ge (=Ge'') centers pre-existing in our samples. The bleaching is mainly due to the post-irradiation conversion of =Ge'' into the paramagnetic H(II) center via trapping of a H atom. Comparison with literature data points out the peculiarities of silica with a low Ge concentration as regards UV induced transformations.

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