Europhys. Lett, 48 (4), pp. 385-389 (1999)
Light shift of coherent population trapping resonances
A. Nagel, S. Brandt, D. Meschede and R. Wynands
Institut für Angewandte Physik der Universität Bonn
Wegelerstr. 8, D-53115 Bonn, Germany
(received 12 July 1999; accepted in final form 20 September 1999)
PACS. 42.50Hz - Strong-field excitation of optical transitions in quantum
systems; multi-photon processes; dynamic Stark shift.
PACS. 32.70Jz - Line shapes, widths, and shifts.
PACS. 42.50Gy - Effects of atomic coherence on propagation, absorption, and amplification of light.
We have measured the spectral position of the absorption minimum in a coherent population trapping resonance in thermal cesium vapor as a function of light intensity. The dependence of position on intensity is found to be almost linear. We have furthermore studied the dependence of this light shift on neon buffer gas pressure and find a strong reduction for higher pressures. So the addition of a buffer gas not only reduces the linewidth of the resonance but also a very important systematic effect for precision measurements.
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