PHASE SQUEEZING IN A 3-LEVEL ATOM MICROMASER

I consider a lossless micromaser with cascade three-level atoms in a c oherent superposition of its three levels. I find that for some values of the atomic flight time and some probability amplitudes for the int ermediate atomic level, the field evolves to a pure state which is the well-known general squeezed state, and the squeeze and displacement p arameters are functions of the atomic input parameters. Therefore it i s possible to choose atomic parameters which produce squeezing in the phase or in the amplitude of the field inside the cavity.