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Journal of Hebei University

Investigation of Electromagnetically Induced Transparency

Yang Li-jun

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

It was summaried in this article that some investigation of well-known Electromagnetically Induced Transparency, including attempted discussion about physical mechanism of this phenomenon. And in comparison with ac stark splitting driven by strong electromagnetic fields, it was pointed that both phenomena had some delicate differences in physical mechanism.

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Conference on Lasers and Electro-Optics•Nov 27, 2002•0 citations
It was summaried in this article that some investigation of well-known Electromagnetically Induced Transparency, including attempted discussion about physical mechanism of this phenomenon. And in comparison with ac stark splitting driven by strong electromagnetic fields, it was pointed that both phenomena had some delicate differences in physical mechanism.
Electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) are similar, but different quantum optical phenomena: EIT results from a Fano interference, whereas ATS is described by the ac Stark effect. Likewise, despite their close resemblance, light-storage techniques based on the EIT memory protocol and the recently proposed ATS memory protocol [Saglamyurek et al., Nat. Photon. 12, 774 (2018)] are distinct: The EIT protocol relies on adiabatic elimination of absorption, whereas the ATS protocol is based on absorption. In this article, we elaborate on the distinction between EIT and ATS memory protocols through numerical analysis and experimental demonstrations in a cold rubidium ensemble. We find that their storage characteristics manifest opposite limits of the light-matter interaction due to their inherent adiabatic versus nonadiabatic nature. Furthermore, we determine optimal memory conditions for each protocol and analyze ambiguous regimes in the case of broadband storage, where nonoptimal memory implementations can possess characteristics of both EIT and ATS protocols. We anticipate that this investigation will lead to deeper understanding and improved technical development of quantum memories, while clarifying distinctions between the EIT and ATS protocols.
Summary form only given.It is well known that a strongly driven transition exhibits a doublet splitting when probed by a weak field, commonly known as AC Stark splitting. It can be observed either by probing the driven two-level itself (Mollow-type spectrum) or via a third level (Autler-Townes-type spectrum). These two type splittings can have very different characteristics, particularly when driven resonantly. The absorptive Mollow spectrum consists of two dispersion-like features, whereas for the Autler-Townes spectrum there is a simple doublet splitting. In this paper we report the observation of both Mollow and Autler-Townes spectrum simultaneously by applying two strong driving fields in a three-level configuration.