This volume presents a collection of papers, written during the last 30 years by Claude Cohen-Tannoudji and his collaborators, on various physical effects which can be observed on atoms interacting with electromagnetic fields. It consists of a personal selection of review papers, lectures given at schools, as well as original experimental papers. Emphasis is put on physical mechanisms and on general approaches, such as the dressed atom approach, having a wide range of applications. Various topics are discussed, such as light shifts, level crossing resonances, multiphoton processes, resonance fluorescence in intense laser fields, photon correlations, quantum jumps, radiative corrections, laser cooling and trapping. This volume includes short introductions by the author. Each paper presented in the volume is preceded by a short commentary giving its motivations, explaining how it fits with the general evolution of the research field, and pointing out connections existing between works done at different periods.
Atoms in weak broadband quasi-resonant fields - light shifts; atoms in linear superpositions of Zeeman sublevels-Zeeman coherences; atoms in strong radiofrequency fields - the dressed-atom approach in the RF domain; atoms in intense resonant laser beams - the dressed-atom approach in the optical domain; the radiative cascade of the dressed atom - photon correlations and quantum jumps; atoms in high-frequency fields or in the vacuum field - simple physical pictures for radiative corrections; atomic motion in laser light - laser cooling and trapping.