Abstract
The absorption and circular dichroism spectra of langasite family crystals, La3Ga5SiO14, La3Ga5GeO14, Ca3Ga2Ge4O14, Sr3Ga2Ge4O14 (red), Sr3Ga2Ge4O14 (green), La3Ta0.5Ga5.5O14, and La3Nb0.5Ga5.5O14, which were doped with chromium ions, have been investigated in the range of 240–850 nm. It is shown that chromium ions are incorporated into the structure of the investigated crystals both in the octahedrally (Cr3+ ion in 1a octahedron) and tetrahedrally (Cr4+ ion in 2d tetrahedron) coordinated positions. The ion ratio Cr3+/Cr4+ changes in a wide range in the crystals studied.
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