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We investigate experimentally and theoretically the Coherent PopulationTrapping (CPT) effect occurring in 87Rb D1 line due to the interaction withlinearly polarized laser light (lin||lin CPT). In this configuration thecoherence has a quadrupol like nature and is strongly influenced by thehyperfine structure of the excited state; consequently the quantum interferencebetween CPT states is an essential feature of this interaction scheme. We studythe lin||lin CPT signal as a function of the laser optical detuning. Thecomparison between experimental and theoretical results allows us to quantifythe contribution from different CPT states to the total signal. Based on theseresults we investigate the signal depending on both the pressure broadening ofthe optical transition and the laser linewidth, and we find in which conditionsthe laser linewidth does not degrade the amplitude of the lin||lin CPT.

Quantitative study of desctructive quantum interference effect on the linklin CPT