Physics – Quantum Physics
Scientific paper
2011-07-04
Phys. Rev. A 83, 053812(2011)
Physics
Quantum Physics
Scientific paper
10.1103/PhysRevA.83.053812
We describe the effect of thermal motion and buffer-gas collisions on a four-level closed N system interacting with strong pump(s) and a weak probe. This is the simplest system that experiences electromagnetically induced absorption (EIA) due to transfer of coherence via spontaneous emission from the excited to ground state. We investigate the influence of Doppler broadening, velocity-changing collisions (VCC), and phase-changing collisions (PCC) with a buffer gas on the EIA spectrum of optically active atoms. In addition to exact expressions, we present an approximate solution for the probe absorption spectrum, which provides physical insight into the behavior of the EIA peak due to VCC, PCC, and wave-vector difference between the pump and probe beams. VCC are shown to produce a wide pedestal at the base of the EIA peak, which is scarcely affected by the pump-probe angular deviation, whereas the sharp central EIA peak becomes weaker and broader due to the residual Doppler-Dicke effect. Using diffusion-like equations for the atomic coherences and populations, we construct a spatial-frequency filter for a spatially structured probe beam and show that Ramsey narrowing of the EIA peak is obtained for beams of finite width.
Firstenberg Ofer
Tilchin E.
Wilson-Gordon A. D.
No associations
LandOfFree
Effects of thermal motion on electromagnetically induced absorption does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effects of thermal motion on electromagnetically induced absorption, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of thermal motion on electromagnetically induced absorption will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-3336