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Resonant two-photon absorption and electromagnetically induced transparency in open ladder-type atomic system
Han Seb Moon1, Heung-Ryoul Noh
1Department of Physics, Pusan National University, Geumjeong-Gu, Busan 609-735, South Korea. hsmoon@pusan.ac.kr
Optics Express
|April 3, 2013
Summary
Researchers explored resonant two-photon absorption (TPA) and electromagnetically induced transparency (EIT) in Rubidium-87 atoms. They observed TPA transforming into EIT with increasing laser intensity, explained by two-photon coherence and mixed terms.
Area of Science:
- Atomic physics
- Quantum optics
Background:
- Two-photon absorption (TPA) and electromagnetically induced transparency (EIT) are fundamental quantum phenomena.
- Ladder-type atomic systems provide a versatile platform for studying light-matter interactions.
Purpose of the Study:
- To experimentally and theoretically investigate the transition from TPA to EIT in an open ladder-type atomic system.
- To analyze the role of coupling laser intensity in this transformation.
- To understand the underlying mechanisms, including two-photon coherence and mixed terms.
Main Methods:
- Experimental study of (87)Rb atoms using resonant two-photon absorption and electromagnetically induced transparency.
- Theoretical modeling considering all degenerate magnetic sublevels.
- Numerical calculation of spectral decomposition under varying coupling laser intensities.
Main Results:
- Observed the transformation of resonant TPA to EIT in the 5S(1/2)-5P(3/2)-5D(5/2) transition of (87)Rb atoms with increasing coupling laser intensity.
- Successfully numerically calculated this TPA to EIT transformation.
- Identified the crossover mechanism as a spectral decomposition into EIT (two-photon coherence) and TPA (mixed term) components.
Conclusions:
- The transition from TPA to EIT is controllable via coupling laser intensity in this atomic system.
- The spectral behavior is accurately described by considering magnetic sublevels and quantum coherence.
- This study offers insights into controlling quantum interference effects in atomic systems.
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