Conversion between electromagnetically induced absorption and transparency in a four-level system

D. Sarkisyan; A. Sargsyan; A. D. Wilson-Gordon; S. Cartaleva

doi:10.1117/12.2177887

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8 January 2015 Conversion between electromagnetically induced absorption and transparency in a four-level system

D. Sarkisyan, A. Sargsyan, A. D. Wilson-Gordon, S. Cartaleva

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Proceedings Volume 9447, 18th International School on Quantum Electronics: Laser Physics and Applications; 944707 (2015) https://doi.org/10.1117/12.2177887
Event: Eighteenth International School on Quantum Electronics: Laser Physics and Applications, 2014, Sozopol, Bulgaria

Abstract

A narrowband R-type resonance is formed in a Λ-system, on the D₁ line of Rb atomic vapor using two continuous diode lasers with λ=795 nm. A 8mm- long cell filled with the Rb vapor and 20 Torr neon gas has been used. We have shown that use of an additional (3^rd) laser which is resonant with the Rb D₂ line (λ=780 nm) makes it possible to control the amplitude and sign of the R -type resonance, i.e. to convert a resonance which demonstrates increase in absorption into one which demonstrates reduction in absorption. The good signal/noise ratio of the observed resonance allows us to follow its behavior in an applied magnetic field from several gauss to several hundred gauss. A description in terms of double-Λ systems allows us to explain the experimental results in a simple manner.

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D. Sarkisyan, A. Sargsyan, A. D. Wilson-Gordon, and S. Cartaleva "Conversion between electromagnetically induced absorption and transparency in a four-level system", Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 944707 (8 January 2015); https://doi.org/10.1117/12.2177887

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