Generating squeezed states by strong laser-atom interaction

A proof is given using, a quantized single mode field in interaction with a n atom in non-relativistic approximation, that the scattered light in stron g laser-atom interaction can be made coherent to squeezed by properly choos ing the wavelength of the laser, the density of the sample of atoms at the laser beam and the pulse duration. In the experiments with gases for harmon ic generation, at the current laser wavelengths this effect is too small to be observed and the term of the square of the field in the Hamiltonian can be safely neglected. Then, the observed light is purely coherent.