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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster III

Q 55.32: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 8 Foyer

From Absorption to Transparency without Switching Dispersion — •Katrin Dahl, Luca Spani Molella, Rolf-Hermann Rinkleff, and Karsten Danzmann — Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Institute for Gravitational Physics, Leibniz Universität Hannover, Callinstr. 38, D-30167 Hannover

With a probe laser beam and coupling laser beam of counter-rotating circular polarizations, the absorption and dispersion in a degenerate two-level system was studied.

For counter-rotatingly polarized laser beams we measured coupling laser absorption spectra as a function of the coupling laser power, below and above the saturation power of the atomic cesium sample. In the case of a probe laser power below saturation for all coupling laser powers, "absorption within transparency" was registered exclusively. By contrast, above saturation a switch from "absorption within transparency" to "transparency within transparency" was detected when the coupling laser power was larger than the constant probe laser power. Interestingly, the corresponding dispersion spectra of the coupling laser remained positive. In other words, opposed to the absorption spectra no switch was observed.

The work was made possible through the financial support of the Collaborative Research Centre SFB407 of the German Research Foundation (Deutsche Forschungsgemeinschaft).