For a coherently driven cavity mode coupled to a cascade three-level atom, the paper's steady-state variances imply both quadratures are squeezed, but only relative to a model-defined reference and using a modified uncertainty bound.
Three-Level Laser Dynamics with the Atoms Pumped by Electron Bombardment
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abstract
We analyze the quantum properties of the light generated by a three-level laser with a closed cavity and coupled to a vacuum reservoir. The three-level atoms available in the cavity are pumped from the bottom to the top level by means of electron bombardment and we carry out our analysis by putting the noise operators associated with the vacuum reservoir in normal order. The maximum quadrature squeezing of the light generated by the laser, operating far below threshold, is found to be 50% below the coherent-state level. We have also established that the quadrature squeezing of the output light is equal to that of the cavity light and has the same value in any frequency interval. This implies that the quadrature squeezing of the laser light is an intrinsic property of the individual photons.
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Squeezing in Both the Plus and Minus Quadratures with the Uncertainty Relation Perfectly Holding
For a coherently driven cavity mode coupled to a cascade three-level atom, the paper's steady-state variances imply both quadratures are squeezed, but only relative to a model-defined reference and using a modified uncertainty bound.