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Stimulated emission from ladder-type two-photon coherent atomic ensemble
Optics Express
|June 8, 2018
Summary
We studied stimulated emission in 87Rb atoms using a ladder-type two-photon coherent atomic ensemble. The seed laser stimulates four-wave mixing (FWM) but also disturbs it via V-type two-photon coherence.
Area of Science:
- Atomic physics
- Quantum optics
Background:
- Investigated stimulated emission in a ladder-type two-photon coherent atomic ensemble.
- Focused on the 5S1/2 - 5P3/2 - 5D5/2 transition of 87Rb atoms.
Purpose of the Study:
- To observe and analyze four-wave mixing (FWM) light stimulated from two-photon coherence.
- To understand the role of a seed laser in FWM generation and coherence dynamics.
Main Methods:
- Utilized pump and coupling lasers to achieve ladder-type two-photon resonance.
- Induced two-photon coherence using a seed laser coupled between ground and excited states.
- Analyzed FWM spectra for varying frequency detuning and seed-laser power.
Main Results:
- Observed broad FWM light stimulated by the seed laser.
- Identified a dip in the FWM spectrum due to three-photon resonance and V-type two-photon coherence.
- Determined the seed laser's dual role as both a stimulator and disturber of FWM.
Conclusions:
- The seed laser is crucial for FWM generation in this system.
- V-type two-photon coherence, induced by pump and seed lasers, can disrupt FWM.
- Understanding these interactions is key for controlling coherent atomic ensembles.
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