Atoms in squeezed light fields

Squeezed light is of interest as an example of a non-classical state of the electromagnetic field and because of its applications both in technology a nd in fundamental quantum physics. This review concentrates on one aspect o f squeezed light, namely its application in atomic spectroscopy. The genera l properties, detection and application of squeezed light are first reviewe d. The basic features of the main theoretical methods (master equations, qu antum Langevin equations, coupled systems) used to treat squeezed light spe ctroscopy are then outlined. The physics of squeezed light interactions wit h atomic systems is dealt with first for the simpler case of two-level atom s and then for the more complex situation of multi-level atoms and multi-at om systems. Finally the specific applications of squeezed light spectroscop y are reviewed.