Abstract
The importance of the role of the ion-lattice coupling indetermining the energy levels of Cr3+ ions in congruentLiNbO3 crystals doped with 2.9% of ZnO is demonstrated in thispaper. The Racah parameters: B = 533 cm-1, C = 3244 cm-1 and the crystal-field intensity Dq = 1527 cm-1 were determined and the Tanabe-Sugano diagram was constructed.The characteristics of the absorption and the emission spectra ofCr3+ ions in these crystals can be explained in terms of theconfigurational-coordinate diagram in the harmonic approximation,with good agreement obtained. The Huang-Rhys parameter S = 6.86 andthe lattice phonon energy ℏω = 343 cm-1 are alsoreported in this work.
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