Cavity-induced backaction in Purcell-enhanced photon emission of a single ion in an ultraviolet fiber cavity

Abstract

We study the behavior of a single laser-driven trapped ion inside a microscopic optical Fabry-Perot cavity. In particular, we demonstrate a fiber Fabry-Perot cavity operating on the principal ${S}_{1/2}\ensuremath{\rightarrow}{P}_{1/2}$ electric dipole transition of an ${\mathrm{Yb}}^{+}$ ion at 369 nm with an ion-cavity coupling strength of $g=2\ensuremath{\pi}\ifmmode\times\else\texttimes\fi{}67(1)$ MHz. We employ the cavity to study the generation of single photons and observe cavity-induced backaction in the Purcell-enhanced emission of photons. Tuning of the amplitude and phase between the driving field and the cavity field built up from photons scattered into the cavity mode by the ion allows us to enhance or suppress the total rate of photon emission from the ion-cavity system.