Absorption and Circular Dichroism Spectra of La3Ga5SiO14 Crystals Doped with Pr3+, Ho3+, and Er3+ Ions

The absorption and circular dichroism (CD) spectra of La3Ga5SiO14 langasite crystals doped with Pr3+, Ho3+, and Er3+ ions have been studied in the wavelength range of 350-700 nm. The electronic transitions of these ions, which replace La3+ ions in the 3e position with the symmetry 2, are observed in the spectra. All transitions are active in both the absorption and CD spectra. The dipole strengths Dom, rotational strengths Rom, and anisotropy factors g have been calculated for well-resolved bands. Some features are noted for the spectra that were obtained, and their relationship with the structure disorder is considered