Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 1, Pages 252-255Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.08.031
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Funding
- Department of Science and Technology, India
- Homi Bhabha Fellowship Council
- Council of Scientific and Industrial Research, India
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We analyze theoretically the phenomenon of electromagnetically induced transparency (UT) under conditions where the probe laser is not in the usual weak limit. We consider the effects in both three-level and four-level systems, which are either closed or open (due to losses to an external metastable level). We find that the EIT dip almost disappears in a closed three-level system but survives in an open system. In four-level systems, there is a narrow enhanced-absorption peak (EITA) at line center, which has applications as an optical clock. The peak converts to an EIT dip in a closed system, but again survives in an open system. (C) 2010 Elsevier B.V. All rights reserved.
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