A Nondegenerate Three-level Cascade Laser Coupled To A Two-mode Squeezed Vacuum Reservoir

Detailed analysis of the squeezing of the cavity as well as the output radiation andrnstatistical properties of the cavity radiation of a nondegenerate three-level cascade laser,rnin which the top and bottom levels of the injected atoms are coupled by an externalrncoherent radiation, and whose cavity is coupled to a two-mode squeezed vacuum reservoirrnis presented. The generated radiation exhibits a high degree of squeezing in the minusrnquadrature either for a weak or strong driving radiation. In general, the degree ofrnsqueezing and mean number of photon pairs increase with the linear gain coefficientrnand squeeze parameter. The driving radiation leads to squeezing of the cavity radiationrneven when ´ = 0 and ´ = 1. Moreover, it is found that there is no distinct differencernbetween the probability for finding odd and even number of photon pairs in the cavity.rnIn addition, the mean number of photons in mode a turns out to be greater than thatrnin mode b

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