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TEM images of the doped glass-ceramic waveguide treated at for , showing nanocrystals dispersed in the amorphous matrix. Bar denotes (a) and (b) unit scales.
Room temperature excitation spectra of emission at of in the doped samples: (a) sample after various heat treatments in air; (b) samples heat treated at for ; [(c) and (d)] photographs of the and samples, respectively, heat treated at and excited at .
Room temperature emission spectra of the doped glass-ceramic waveguide obtained upon excitation as a function of the thermal annealing.
Optical and spectroscopic properties of the doped waveguides heat treated at various temperatures in air. Refractive index at in TE polarization , thickness , FWHM of the emission at , and asymmetry ratio given by the intensity ratio of the to the transition are given.
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