Optical characterization of inter-stark energy levels and effects of temperature on sharp emission lines of Nd{sup}3+ in CaZn{sub}2Y{sub}2Ge{sub}3O{sub}12

摘要

A characterization of the Stark components of the 4{sup left}I{sub}(9/2) and 4{sup left}I{sub}(11/2) manifolds have been performed using the room temperature fluorescence spectra for the 4F{sub}(3/2)→4{sup left}I{sub}(9/2) and 4{supleft}F{sub}(3/2) → 4{sup left}I{sub}(11/2) transitions of Nd{sub}3+ in CaZn{sub}2Y{sub}2Ge{sub}3O{sub}12 laser crystal. The temperature dependencies of the linewidths and line shifts of the inter-Stark transitions of the 939.4 (R{sub}1→X{sub}5) and1058.8 (R{sub}1→Y{sub}1) nm lines within the respective intermanifold transitions of 4{sup left}F{sub}(9/2) →4{sup left}I{sub}(9/2) and 4{sup left}F{sub}(9/2) →4{sup left}I{sub}(11/2) have been also investigated. The linewidths of these transitionswere found to increase with increasing temperature. The 939.4 nm line shifted toward the shorter wavelength, while the 1058.8 nm line shifted toward the longer wavelength. The experimental results of the temperature-dependent widths and shifts of theseemission lines are explained using the phonon-ion interaction theory which assumes the Debye model for phonons in crystalline solids.