https://doi.org/10.1140/epjd/s10053-026-01149-4
Research - Photon
A coherent switch between EIT and EIA effects in N-type system
1
National Institute of Optics and Lasers, Multimedia University of Kenya, 15653-00503, Nairobi, Kenya
2
The Teachers Service Commission, Private Bag, Nairobi, Kenya
a
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Received:
15
November
2025
Accepted:
15
March
2026
Published online:
27
April
2026
Abstract
In this paper, we present a theoretical analysis for a coherent switch between electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) for N-type atomic system. The coherent switch is due to the induced atomic coherence, which depends on the intensity of coupling pump lasers. For atomic vapor at a finite temperature, the EIT-EIA switch is lost due to Doppler overlaps, however, a EIA dip is induced on the transparency spectrum of the probe. Additionally, a switch between transparency and enhanced absorption for N-type configuration is due to coherence effect causing EIT and optical pumping effect (a source of ground state levels population dynamics), both effects also depends on the intensity of the blue pump lasers.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
