Abstract
When the three transitions from the three nearly degenerate excited levels to single ground level in a four-level inverted-tripod scheme atomic system interact with the same vacuum, there appears multiple vacuum induced coherence (VIC) induced by the interference among these transitions. We investigate the effects of the VIC on the probe absorption properties, and find that the VIC from symmetric transitions enhances the central absorption, while suppresses the sideband absorptions within the double transparency spectrum. On the other hand, the VIC from nonsymmetric transitions increases the minimum value of the double transparency.
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