White light cavity via electromagnetically induced transparency based four-wave mixing in four-level Rb atoms
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White light cavity via electromagnetically induced transparency based four‑wave mixing in four‑level Rb atoms Tayebeh Naseri1 · Zeynab Maleki1 · Masoumeh Hatami‑Mehr1 Received: 24 March 2020 / Accepted: 30 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, we investigate tunable broadband optical cavity via a medium with four-level atoms interacting with two strong pump fields and a weak probe field in an N-type configuration. The results indicate the amplitude of the Stokes field causes an additional control mechanism of the dispersion behavior. Moreover, the four-wave mixing condition induces higher linear gain for the probe field. Therefore, it allows the compensation of unavoidable optical losses through the optical cavity. By adjusting the control fields in the four-wave mixing condition, the negative dispersion of the atomic medium is able to balance the normal dispersion of cavity in the zero-absorption area, consequently a white-light cavity with tunable wideband is achievable. The present scheme is interesting for development of white-light-cavity applications such as gravitational wave detection. Keywords White-light-cavity (WLC) · Electromagnetic induced transparency (EIT) · Four-wave mixing (FWM) · Superluminal light
1 Introduction The atom-light interaction induces and consequently manipulate the optical signals which is very important in the cavity quantum electrodynamics field. One of the practical ways to induce and modulate light is nonlinear four-wave mixing (FWM) in multilevel atomic systems. FWM is one of the distinguished phenomena in nonlinear optics in which three electromagnetic fields interact with a nonlinear medium and generate an electromagnetic field with a new frequency. It was found that the probe field dispersion can be altered by a coherent field which is generated via four-wave mixing process in the atomic system [1]. Therefore, it can be used to improve the cavity bandwidth without the drawback of reducing its buildup. Broadband cavity or white-light cavity (WLC) is priceless for the applications which are not sensitive to the input intensity fluctuation. These improved and controlled cavity transmission linewidths could find numerous fascinating sensing and telecommunication applications e.g. hypersensitive laser
* Tayebeh Naseri [email protected] 1
Department of Physics, Razi University, Kermanshah, Iran
gyroscopes [2, 3], wide-band optical switches [4], optical sensors [5, 6], and anomalous ring-down oscillations [7]. The fundamental element in WLC is a dispersive phase compensation mechanism having a negative phase slope. Several approaches have been investigated for such phase compensation realization [8–11]. One of the approaches for implementation WLC is using a medium with negative dispersion inside the cavity. Such this anomalous dispersion in the intracavity medium causes the transmission linewidth of cavity broader than the empty cavity [12, 13]. Under this circumstance with certain parameters, the cavity tran
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