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Squeezed states of light in micromaser

V.I. Coroli, Koroli, V.I., Король, В.И., Ciorbă, V.G., Чорбэ, В.

Published Apr 1, 2006• 0 citations
OpenAlex

Abstract

We study a lossless micromaser with atomic polarization. It is shown that for certain values of time of the atomic flight through the cavity, the field evolves to a pure state. The squeezing properties of the cavity field are examined.

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I consider a lossless micromaser with cascade three-level atoms in a coherent superposition of its three levels. I find that for some values of the atomic flight time and some probability amplitudes for the intermediate atomic level, the field evolves to a pure state which is the well-known general squeezed state, and the squeeze and displacement parameters are functions of the atomic input parameters. Therefore it is possible to choose atomic parameters which produce squeezing in the phase or in the amplitude of the field inside the cavity.
Phase properties of the micromaser field are studied for different initial states of the cavity field and the atom. It is shown that a multipeak phase structure develops when the cavity field is initially in a coherent state and the atoms enter the cavity in their excited state, which eventually leads to the randomization of the phase. If initially the field is thermal and the atoms entering the cavity are polarized, the steady state with a considerably well defined phase is reached, which asymptotically can be one of the cotangent states or some mixed state depending on the atom-cavity interaction time. An interesting effect of switching between the two- and three-peak phase structure caused by each subsequent atom passing the cavity has been found. \textcopyright{} 1996 The American Physical Society.