Turning an Organic Molecule into a Coherent Two-Level Quantum System using a Tunable Fabry-Perot Microcavity - Wang D; Kelkar H; Martin-Cano D; Rattenbacher D; Shkarin A; Utikal T; Gotzinger S; Sandoghdar V (2019 Conference On Lasers And Electro-Optics, Cleo 2019 - Proceedings, 2019)