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Advanced Photonics

Magnetically Induced Simultaneous Slow and Fast Light by Phase Control

Bin Luo, Hong Mei Guo

Published Jan 1, 2011• 0 citations
Publisher

Abstract

Λ-type atom coupled by additional driving light and radio frequency (RF) field can generate controllable simultaneous slow and fast light at two frequencies. Distortions by radiative dampings are discussed and compensation method is suggested.
DOI
10.1364/sl.2011.slwb2

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A Lambda-type atom coupled by a driving light field and an rf field is restudied. It shows that, owing to Autler-Townes splitting caused by the driving light field and the magnetic dipole transition caused by the rf field, the medium shows distinct characteristics and exhibits the simultaneous slow and fast light at two frequencies. This effect can be attained by simply increasing the magnetic field and making its Rabi frequency much stronger than the probe light. Also, slow and fast light can be converted flexibly between two frequencies by phase control of the rf field.
The slow light effects of an amplitude modulated Gaussian (AMG) pulse in a cesium atomic vapor are presented. In a single-ΛΛΛ type electromagnetically induced transparency (EIT) medium, more severe distortion is observed for an AMG pulse than a Gaussian one. Using Fourier spectrum analysis, we find that the distortion, as well as the loss, is dominantly caused by linear absorption than dispersion. Accordingly, a compensation method is proposed to reshape the slow light pulse based on the transmission spectrum. In addition, we find a novel way to obtain simultaneous slow and fast light.
Slow light of an amplitude-modulated Gaussian (AMG) pulse in cesium vapor is demonstrated and studied, since the appropriate amplitude modulation to a single pulse can enrich its spectrum and even enhance the bandwidth utilization efficiency of the slow light system. In a single- ¿ type electromagnetically induced transparency (EIT) system, the slowed AMG pulse experiences severe distortion, which is mainly owing to the frequency dependent transmission of medium. Additionally, due to its spectral distribution, the frequency dependent dispersion of the medium causes simultaneous slow and fast light for different spectral components and thus a certain dispersive distortion of the AMG pulse. Further, a post-processing method is proposed to recover the slowed (distorted) pulse, which indicates that, by introducing a linear optical system with desired gain spectrum, the optical pulse can be recovered in an ¿all-optical¿ way. Finally, we discuss the limitations of this compensation procedure in detail. Although this method is demonstrated in the cesium vapor using EIT, it is also applicable to a wide range of slow light systems.
We study the dispersion and absorption spectra of a weak probe in a $\ensuremath{\Lambda}$-type three-level atomic system with closely ground sublevels driven by a strong field and damped by a broadband squeezed vacuum. We analyze the interplay between the spontaneous generated coherence and the squeezed field on the susceptibility of the atomic system. We find that by varying the intensity of the squeezed field the group velocity of a weak pulse can change from subluminal to superluminal. In addition we exploit the fact that the properties of the atomic medium can be dramatically modified by controlling the relative phase between the driving field and the squeezed field, allowing us to manipulate the group velocity at which light propagates. The physical origin of this phenomenon corresponds to a transfer of the atomic coherence from electromagnetically induced transparency to electromagnetically induced absorption. Besides, this phenomenon is achieved under nearly transparency conditions and with negligible distortion of the propagation pulse.