(a) Two-dimensional absorption coefficient mapping profile (3 × 3.5 mm) of one YAG ceramic sample with a 100 µm spatial resolution before annealing. (b) The absorption coefficient variation from position A to B with steepest gradient in (a) is fitted with error function. The fitted diffusion length is 2.2 mm corresponding to the combined grain boundary and bulk diffusivity of oxygen in the order of 10−7 cm2/s.24
Absorption coefficient of non-doped YAG (left halves) and Nd-doped YAG (right halves) ceramics and single crystals at 1064 nm. Closed diamonds, open dots, and open triangles represent single crystals (SC), non-reactively sintered ceramics (CNRS), and reactively sintered ceramics (CRS), respectively.
In-line transmittance measurement from 1.2 to 3.1 eV (1 µm to 400 nm) of a ceramic sample. Blue and red lines represent measured and fitted spectra, respectively. The equally spaced bands 1.5 eV, 2.1 eV, and 2.7 eV are fitted using a bound polaron model.
Dependence of 1 µm absorption coefficient of different YAG samples on their Si impurity concentration for (1) Ca concentration [Ca] < 0.5 wt. ppm and (2) [Ca] = 240 wt. ppm. The dashed line is added for visualization purposes.
The measured concentration range (in wt. ppm) of impurities in YAG samples, in a descending order of their impurity concentrations.
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