Quochi, F.Saba, M.Ciuti, C.Stanley, R. P.Houdre, R.Oesterle, U.Staehli, J. L.Deveaud, B.Bongiovanni, G.Mura, A.2007-08-312007-08-312007-08-31200010.1103/PhysRevB.61.R5113https://infoscience.epfl.ch/handle/20.500.14299/11392WOS:000085707000016We study the coherent optical response of a very high-finesse microcavity with a single quantum well by means of degenerate subpicosecond pump-probe spectroscopy. The dynamics of the ac Stark effect versus Pump intensity is investigated upon tuning the empty-cavity;mode-below and above the exciton transition energy, at the exciton continuum onset. The evolution from a simple dynamical excitonic shift to a dynamical splitting is clearly observed in both eases. The qualitative, agreement with numerical calculations based on the semiconductor Maxwell-Bloch equations is good.QUANTUM WELLStext::journal::journal article::research article