Effects of Neighboring Transitions on Electromagnetically Induced Absorption and Transparency in 85rb Atoms ㅠBased on Linear Parallel Polarizations of Coupling and Probe Beams

The effects of neighboring transitions through Doppler broadening on the electromagnetically induced absorption (EIA) and electromagnetically induced transparency (EIT) of the degenerate two-level system (DTLS) in $^{85}$Rb atoms with respect to the linear parallel polarization configuration of coupling and probe lasers have been investigated. The calculated coherent absorption profiles with and without neighboring effects have been compared to elucidate the neighboring effects between the DTLS and nearby states for the conversion between EIA and EIT. Even in the case of the closed system, i.e., $F_g=3 \rightarrow F_e=4$ of $^{85}$Rb, for the first time, EIT instead of EIA has been observed owing to the neighboring effect of dominant $F_g=3 \rightarrow F_e=3$ on the linear parallel polarization configuration case of $^{85}$Rb in the low power regime. All the transitions ($F_g=3 \rightarrow F_e$=2 and 3 and $F_g=2 \rightarrow F_e$=1, 2, and 3) of linear parallel polarization cases exhibit EIT owing to dominant neighboring EIT in the DTLS. In each polarization scheme, the observed spectral trends of the transitions are similar owing to the neighboring effect. The EIT spectral trends with the neighboring effect of $F_g=2 \rightarrow F_e$=1, 2, and 3 are governed by the openness of pure DTLS calculation.