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Optics Communications

Wave-mixing-induced transparency with zero phase shift in atomic vapors

Feng Zhou, Chengjie Zhu, Y. Li

Published Aug 23, 2017• 0 citations
Publisher
DOI
10.1016/j.optcom.2017.08.011

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We use a conventional linear Airy beam to prepare a nonlinear Airy beam via four-wave mixing (FWM) and six-wave mixing (SWM) processes in an atomic vapor. We find that its ballistic trajectory is a result of the competition between the transverse self-acceleration and nonlinear phase shift, and the intensity of Airy beam's sub lobes or main lobe is suppressed due to destructive interference of the FWM and SWM processes. By controlling the nonlinear overlap area of the linear Airy beam and two Gaussian beams, we find that the Airy beam's profile varies from one-dimensional (1D) to two-dimensional (2D). The profile evolution process can be applied to create a new (to our knowledge) type of nonlinear filter. In addition, we also observe the Airy beam's pattern in momentum space with electromagnetically induced transparency (EIT) in an atomic vapor. Our research results open up new possibilities for manipulating Airy beams that cannot be achieved with a conventional Airy beam.
We investigate the reduction of Rayleigh scattering in four-wave mixing due to photo-induced spatial redistribution of atoms in atomic vapors. The Rayleigh scattering from the pump beams in optical phase conjugation is a major source of noise, which affects the fidelity of the phase-conjugated image. In the blue-shifted operation, the atoms are driven toward the low-intensity regions of the standing-wave pattern, leading to a reduction of Rayleigh scattering. We also investigate the effect of saturation on the differential scattering cross section.
We study the enhancement and suppression of different multi-waving mixing (MWM) processes in a Rydberg-EIT rubidium vapor system both theoretically and experimentally. The nonlinear dispersion property of hot rubidium atoms is modulated by the Rydberg-Rydberg interaction, which can result in a nonlinear phase shift of the relative phase between dark and bright states. Such Rydberg-induced nonlinear phase shift can be quantitatively estimated by the lineshape asymmetry in the enhancedand suppressed MWM processes, which can also demonstrate the cooperative atom-light interaction caused by Rydberg blockaded regime. Current study on phase shift is applicable to phase-sensitive detection and the study of strong Rydberg-Rydberg interaction.