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Switching from „absorption within transparency“ to “transparency within transparency” in an electromagnetically induced absorption dominated transition

MPS-Authors

Dahl,  Katrin
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Spani Molella,  Luca
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Rinkleff,  Rolf-Hermann
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Danzmann,  Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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OptLett33_983.pdf
(Publisher version), 265KB

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Citation

Dahl, K., Spani Molella, L., Rinkleff, R.-H., & Danzmann, K. (2008). Switching from „absorption within transparency“ to “transparency within transparency” in an electromagnetically induced absorption dominated transition. Optics Letters, 33(9), 983-985.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-62A8-5
Abstract
The absorption of a resonant coupling laser driving a closed degenerate two-level system in an atomic cesium beam was investigated as a function of the detuning of a second laser probing the same transition. The measurements were performed for four different polarization combinations of the two laser beams. Except for the beams of counterrotating polarizations all coupling-laser absorption profiles showed “absorption within transparency,” i.e., the absorption in the region around the two-photon resonance was smaller than the absorption corresponding to the one-photon transition induced by the coupling laser, and an extra absorption peak was observed on this curve at the two-photon resonance. With regard to the beams of counterrotating polarizations we observed a switch from absorption within transparency to “transparency within transparency” when the probe-laser power exceeded the constant coupling-laser power. In other words, the cesium ensemble became mostly transparent to the coupling-laser beam at the two-photon resonance.