Effect of Neighboring Transitions on Critical Angle in Conversion between EIA and EIT in 87Rb Atoms
Preprints.org
Aisar-ul Hassan , Heung-Ryoul Noh ,and Jin-Tae Kim
Posted Date: 22 October 2024
doi:10.20944/preprints202410.1613.v1
The effects of neighboring transitions (ENT) on electromagnetically induced transparency (EIT), electromagnetically induced absorption (EIA), and the conversion between EIA and EIT in a degenerate multi-level system of 87Rb atoms were studied in mmmterms of the angle (θ) between the polarization axes of the coupling and probe beams. The predicted critical values of θ, in which EIT transitioned to EIA, were consistent with the experimental values. In this work these results were systematically conrmed using the calculated spectra by varying the frequency spacings in the excited state of 87Rb via a factor called the ratio. We observed that when the ratio was less than 0.1, the critical angle θc was inverted. This may be attributed to the interplay between the strengths of the EIA and EIT as the ENT varied. We also discovered that by modifying the frequency spacings in the excited state of 87Rb, it becomes feasible to predict ENT and the interplay between EIT and EIA in alkali-metal atoms.
Schematic of the experimental setup. SAS: saturated absorption spectroscopy; W: window; HWP: half-wave plate; PBS: polarizing beam splitter; BE: beam expander; AOM: acousto-optic modulator; M: mirror; BS: beam splitter; Bd: beam dump; PD: photodetector.