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Title: Effects of temperature and ground-state coherence decay on enhancement and amplification in a delta atomic system
Authors: Manjappa, Manukumara
Undurti, Satya Sainadh
Karigowda, Asha
Narayanan, Andal
Sanders, Barry C
Issue Date: Oct-2014
Publisher: American Physical Society
Citation: Physical Review A, 2014, Vol. 90, p043859
Abstract: We study phase-sensitive amplification of electromagnetically induced transparency in a warm Rb85 vapor wherein a microwave driving field couples the two lower-energy states of a Λ energy-level system thereby transforming into a Δ system. Our theoretical description includes effects of ground-state coherence decay and temperature effects. In particular, we demonstrate that driving-field-enhanced electromagnetically induced transparency is robust against significant loss of coherence between ground states. We also show that for specific field intensities, a threshold rate of ground-state coherence decay exists at every temperature. This threshold separates the probe-transmittance behavior into two regimes: probe amplification vs probe attenuation. Thus, electromagnetically induced transparency plus amplification is possible at any temperature in a delta system.
Description: Open Access
ISSN: 1050-2947
1094-1622 (Online)
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Copyright: 2014 The American Physical Society
Appears in Collections:Research Papers (LAMP)

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