2025/11/07 by Luozhen Li, Akshay Babu Karyath, Li, Luozhen +26
Physics and Astronomy · Engineering · Materials Science · #Quantum optics and atomic interactions #Perovskite Materials and Applications #Luminescence Properties of Advanced Materials
paper · pdf · doi:10.48550/arxiv.2511.05370
We characterize spectroscopic and coherence properties of the 1451.37 nm excited-state zero-phonon line (ZPL) between the 3F4 and the 3H4 manifolds of a thulium-doped yttrium aluminum perovskite (Tm3+:YAlO3) crystal at temperatures around 1.5 K. We measure the absorption spectrum between the 3H6 - 3F4 and 3F4 - 3H4 manifolds, the inhomogeneous broadening of the 3F4 - 3H4 (excited-state) ZPL, and the lifetimes of the higher-lying and lower-lying excited states. We also investigate level shifts caused by the quadratic Zeeman interaction as well as spectral hole-burning spectra with varying magnetic fields, providing insights into hyperfine interactions. Using again spectral holes but also optical free induction decays (FIDs), we assess optical coherence times, finding a maximum of 4.75 ± 0.07~μs at B=2T and low ion concentration in the 3F4 level. Our results -- the first to demonstrate coherence of an excited-state transition in a rare-earth crystal -- suggest the possibility of exploiting such transitions for quantum technology.