Abstract
Extremely large optical Kerr non-linearities (n2) and (n4) were measured in two closed degenerate two-level transitions in the caesium D2 line when a probe and a coupling laser simultaneously probed and coupled the hyperfine structure in an atomic beam. The magnitude of the measured non-linearities in both transitions were found to be a function of the coupling laser intensity and of the probe detuning from the two-photon resonance. In a figure of merit, the ratio between the non-unitarian part of the refractive index and the absorption coefficient measured in conditions of electromagnetically induced transparency showed a maximum value for a probe detuning of 160 kHz from the two-photon resonance and resulted in being 105 times larger than in the absence of the coupling laser field.
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32.70.Jz; 42.50.Gy; 42.65-k
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Spani Molella, L., Rinkleff, RH., Kühn, G. et al. Giant Kerr effect in closed degenerate two-level transitions. Appl. Phys. B 90, 273–277 (2008). https://doi.org/10.1007/s00340-007-2824-2
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DOI: https://doi.org/10.1007/s00340-007-2824-2