Transient photoluminescence enhancement as a probe of the structure of impurity-trapped excitons in CaF${}_2$:Yb${}^{2+}$

Michael F. Reid, Pubudu S. Senanayake, Jon-Paul R. Wells +5

We demonstrate a direct measurement of the energy levels of impurity-trapped excitons in CaF${}_2$:Yb${}^{2+}$. The radically different radiative decay rates of the lowest exciton stat…