Magnetic splitting of electromagnetically induced transparency and absorption spectra in a standing-wave coupled lambda-type system

Abstract

We study the splitting of traveling wave and standing wave coupled Electromagnetically Induced
Transparency (EIT) and Electromagnetically Induced enhanced Absorption (EIA) lines in the presence
of a uniform magnetic field in an Electromagnetically Induced Grating (EIG). We realize a
Λ-type system in a room-temperature Doppler-broadened buffer-gas-free, unshielded vapor cell of
pure 133Cs atoms. Different orientations of the magnetic field are studied while the polarizations of
the coupling and probe laser beams are arranged in the lin ⊥ lin configuration. The effects of the
different field directions on the EIT and the EIG-induced EIA are explained in light of the existing
theory. The magnetically induced high-contrast features in the EIG scheme are also discussed in
comparison to the low-contrast EIT features observed for the same strengths of magnetic field.

Velocity selective multiple two-photon dark and bright resonances in Potassium vapor

“…Numerous experiments have been carried out in diverse atomic systems such as 87 Rb [15], 133 Cs [16,17],…”

“…This allows for a fortuitous swapping of the transition pathways as will be shown in details in the following sections, which in turn is responsible for observing additional quantum interference signals reported in this article. We note that such swapping of the transition pathways is generally allowed in all physical systems where EIT-EIA phenomena is experimentally observed including well studied atomic systems such as Rb [28][29][30] and Cs [17]. Consequently, a group of atoms having velocity exceeding a critical velocity = pD v c k 2 hf , (where Δ hf = 461.7 MHz is the ground state hyperfine splitting, k is the wave vector) can create another two-photon resonance by interchanging the excitation pathways of probe and control beams as depicted in the figure 1.…”