In rare-earth ion-doped crystals, inhomogeneous absorption profiles reflect the distribution of local environments experienced by individual ions. While each optical transition probes this distribution differently, their fine spectral structures may retain correlations arising from shared local perturbations. In this paper, we present a low-temperature, high-resolution spectroscopic study in ${\mathrm{Er}}^{3+}:\mathrm{YSO}$ of the transition ${}^{4}I_{15/2}\to {}^{4}I_{11/2}$ at 980 nm and compare it to the well-known transition ${}^{4}I_{15/2}\to {}^{4}I_{13/2}$ at 1.5 $\mu \mathrm{m}$. Using spectral hole burning on one transition while monitoring the other, we uncover spectral correlations across two transitions connecting distinct spin-orbit multiplets, providing insight into the microscopic origin of inhomogeneous distributions in rare-earth doped crystals.

Close

PrevNext

View figure in article

• Light-matter interaction
• Optical coherence
• Rare-earth doped crystals
• Coherent control
• Optical spectroscopy