SPECTROSCOPIC ANALYSIS OF ER3-NIOBATE( TRANSITIONS IN LITHIUM)

We report on the results of a spectroscopic analysis of the transition strengths of Er-doped LiNbO3. The line strengths of several transitio ns from the ground state to excited state manifolds are evaluated from measured polarised absorption spectra and analysed using Judd-Ofelt t heory, taking into account the crystal anisotropy, The measured and ca lculated oscillator strengths at 300 K compare favourably within the t ypical uncertainties associated with the Judd-Ofelt theory. The Judd-O felt parameters obtained have been used to evaluate the excited-state- absorption (ESA) transition strengths from the I-4(11/2) level, which have important implications for pumping Er:LiNbO3 devices.