Electron-lattice coupling in congruent Co-doped LiNbO3:Cr3+:ZnO crystal

TORCHIA, G. A.; MARTINEZ MATOS, O.; VAVELIUK, P.; TOCHO, J. O.

JOURNAL OF PHYSICS CONDENSED MATTER

IOP PUBLISHING LTD

Año: 2001 vol. 13 p. 6577 - 6583

0953-8984

The importance of the role of the ion-lattice coupling in determining the energy levels of Cr3+ ions in congruent LiNbO3 crystals doped with 2.9% of ZnO is demonstrated in this paper. 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 of Cr3+ ions in these crystals can be explained in terms of the configurational-coordinate diagram in the harmonic approximation, with good agreement obtained. The Huang-Rhys parameter S = 6.86 and the lattice phonon energy ω = 343 cm-1 are also reported in this work.