Optical absorption in the wavelength range of 305–400 nm in (a) -cut and (b) -cut crystals that undergone the Li-rich VTE treatment of 12, 30, 50, and 74 h and the post-VTE annealing procedure. For reference, the spectra of the corresponding as-grown congruent crystals are also shown. The OAE at the absorption coefficient of is indicated for each sample.
content vs VTE duration for -cut (open squares) and -cut (full squares) plates. The solid-line and dotted curves represent the fits to the scattered data. The fitted expressions are indicated.
content vs crystal thickness for the VTE-treated plus annealed -cut plates that undergone the VTE duration of 6 (full squares), 12 (full circles), and 30 h (full triangles).
Depth profiles of SIMS signals detected from (a) -cut and (b) -cut Er-diffused crystals that underwent the VTE duration of 6 (open circle), 12 (asterisk), 30 (triangle), and 74 h (open square) before the Er diffusion procedure. The solid-line curves denote the best fits to the experimental data by using a complementary error trial function.
Diffusivity of into (a) -cut and (b) -cut as a function of content at (full squares). The solid-line curves denote the best fits to the experimental data by using a monoexponential decay trial function. The fit parameters are indicated in each diagram.
A summary of VTE and Er diffusion conditions, measured OAE at the absorption coefficient of , evaluated content, diffusion depth, and diffusivity at for the - and -cut samples studied. Data given in the parentheses in the second column from the right side are the numerical values of the fit parameter or in Eqs. (4) and (5).
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