Nonreciprocal recovery of electromagnetically induced transparency by wavenumber mismatch in hot atoms

• URL: http://arxiv.org/abs/2403.01553v1
• Date: Sun, 3 Mar 2024 16:11:16 GMT
• Title: Nonreciprocal recovery of electromagnetically induced transparency by wavenumber mismatch in hot atoms
• Authors: Lida Zhang, Nina Stiesdal, Hannes Busche, Mikkel Gaard Hansen, Thomas Pohl, Sebastian Hofferberth
• Abstract summary: In a three-level atomic ladder-system, Doppler broadening limits the visibility of electromagnetically-induced transparency (EIT) when the probe and control fields are co-propagating. We show the underlying mechanism to be an avoided crossing of the states dressed by the coupling laser as a function of atomic velocities when $k_pk_c$. We investigate how the non-reciprocity scales with wavelength mismatch and show how to experimentally demonstrate the effect in a simple Rydberg-EIT system using thermal Rubidium atoms.
• Score: 0.0699049312989311
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: For multi-level systems in hot atomic vapors the interplay between the Doppler shift due to atom velocity and the wavenubmer mismatch between driving laser fields strongly influences transmission and absorption properties of the atomic medium. In a three-level atomic ladder-system, Doppler broadening limits the visibility of electromagnetically-induced transparency (EIT) when the probe and control fields are co-propagating, while EIT is recovered under the opposite condition of counter-propagating geometry and $k_{p} < k_{c}$, with $k_{p}$ and $k_{c}$ being the wavenumbers of the probe and control fields, respectively. This effect has been studied and experimentally demonstrated as an efficient mechanism to realize non-reciprocal probe light transmission, opening promising avenues for example for realization of magnetic-field free optical isolators. In this tutorial we discuss the theoretical derivation of this effect and show the underlying mechanism to be an avoided crossing of the states dressed by the coupling laser as a function of atomic velocities when $k_{p}<k_{c}$. We investigate how the non-reciprocity scales with wavelength mismatch and show how to experimentally demonstrate the effect in a simple Rydberg-EIT system using thermal Rubidium atoms.

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