https://doi.org/10.1140/epjd/s10053-025-01004-y
Regular Article - Atomic Physics
Line broadening analysis for open states: two- and three-photon spectroscopy
1
National Institute of Optics and Lasers, Multimedia University of Kenya, 15653-00503, Nairobi, Kenya
2
The Teachers Service Commission, Private Bag, Nairobi, Kenya
Received:
21
September
2024
Accepted:
16
April
2025
Published online:
16
May
2025
In this paper, we present a theoretical analysis of line broadening mechanisms for open states in two-photon spectroscopy (a V-type atomic system). The effects of optical pumping of population to a dark state (or meta-stable states) and partial Doppler broadening due to wavelength mismatch are solved using electromagnetically induced absorption (EIA) effect in triple resonance spectroscopy. The finite linewidth of IR transition and opposite Doppler shifts of the fixed IR laser frequency fields in a counter-propagation 
-system, which restricts EIA effect to a narrow range of frequencies. For atomic vapor at a finite temperature, narrow dips with large amplitude are induced on the transparency spectra of the probe, effectively resolving closely spaced lines of the 
state in 
Rb.
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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.
