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Slow and Fast Light (SL)

Electromagnetically-Induced-Transparency Effect in a V-type Medium Controlled by an Incoherent Pumping Field

Wenzhuo Tang, Luming Li, Hong Mei Guo

Published Jan 1, 2008• 0 citations
Publisher

Abstract

The electromagnetically induced transparency effect in a V-type medium controlled by an incoherent pumping field is studied both experimentally and theoretically, which shows that different propagation directions have absolutely opposite effect [1].
DOI
10.1364/sl.2008.jmb15

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We show the possibility of transparency and soliton effects for an intense pulse propagating in a VVV-type medium in which two upper resonant sublevels experience fast field-induced decay due to incoherent coupling to an upper lying state or continuum. The transparency arises as a result of the combined action of population trapping on the sublevels leading to interference suppression of the relaxation channel, and coherent Rabi cycling induced by the laser field.
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A three-level lambda system driven by multicolor control, pump, and probe fields is investigated. The pump and probe fields are derived from the same laser with opposite propagating directions. Due to the Doppler effect, the zero group-velocity atoms face bichromatic fields, while other atoms face trichromatic fields. The atomic medium shows distinct characteristics and exhibits simultaneous electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) at two frequencies. EIT and EIA peaks have a fixed relationship with frequency, which is determined by the Doppler shifts.