Abstract
A scheme of optical polarization modulation of a linearly polarized infrared probe field is studied in a degenerate four-level Yb atomic system. We have observed an anomalous transmission spectra of two circular polarization components of the probe field exhibiting an enhanced two-photon absorption and a three-photon gain with comparable magnitude, leading to the lossless transmission and enhanced circular dichroism. We carried out a proof-of-principle experiment of fast optical polarization modulation in such a system by modulating the polarization state of the coupling field. The observed enhanced two-photon absorption and three-photon gain of the probe field are due to the result of competing atomic coherence effects.
| Original language | English |
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| Article number | 063819 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 71 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2005 Jun |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics