Properties of laser-induced gratings in Eu-doped glasses

The properties of permanent, laser-induced gratings were studied in ${\mathrm{Eu}}^{3+}$-doped glasses. These gratings are associated with a structural modification of the glass host in the local environment of the ${\mathrm{Eu}}^{3+}$ ions, and we have investigated the effects produced by altering the ${\mathrm{Eu}}^{3+}$ concentration and by changing the composition of the glass host. A two-level-system model is developed to explain the results.