Resonant electron–phonon coupling of Yb3+ in YAG

Abstract

An analysis of Yb3+ spectra in YAG in terms of the splitting of the zero-phonon lines in the case of near resonance between Stark levels and sharp peaks in the phonon spectrum is presented. The theoretical relations allow estimation of the position of the electronic level and vibronic coupling strength from the intensity ratio and spectral shifts. A new energy level scheme for the 2F5/2 Yb3+ multiplet in YAG is proposed.