29.
It is shown that high-contrast resonance of electromagnetically induced transparency (EIT) in a ladder Ξ-system of 5
S 1/2-5
P 3/2-5
D 5/2 levels can be formed in optical cells containing a column of rubidium vapor with thickness
L in an interval of 100 nm ≤
L ≤ 780 nm. Using bichromatic laser radiation with certain parameters, an 83% contrast of the EIT resonance (or dark resonance, DR) has been achieved for a vapor column thickness of
L = 780 nm. An important condition for the formation of high-contrast DR is that the frequency of the coupling laser radiation must be resonant with the frequency of the corresponding 5
P 3/2-5
D 5/2 transition (for the probe radiation frequency scanned over the 5
S 1/2-5
P 3/2 transition). It is also shown that a DR can be formed at a record small vapor column thickness of
L ≈ 100 nm. Expressions that can be used to estimate the expected DR width at small
L values are presented.
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