Two-mode quantized electromagnetic fields can be entangled and admit a largenumber of coherent states. In this paper, we consider a two-mode system thatconsists of a two-level atom interacting with a two-mode quantizedelectromagnetic field, which is initially prepared in an entangled two-modecoherent state, via a nondegenerate two-photon process in a lossless cavity. Westudy the quantum fluctuations in the two-mode system and investigate in detailthe effects of detuning, Stark shift and atomic coherence on atomic dipolesqueezing (ADS). We show that ADS strongly depends on the atomic coherence. Itis found that the stronger the correlations between the two modes are involved,the more the ADS could be generated. The detuning or Stark shift has adestructive effect on ADS, but the combined effect of the detuning and Starkshift may lead to a regular, periodical and strong ADS pattern.
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