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High-contrast coherent population trapping signal was observed on the Cs-D1 line using a bichromatic linear polarized light (lin||lin) field. The maximum absorption contrast of about 10% was obtained was nearly two times higher than that measured with the standard configuration of bichromatic circularly polarized light (ς¿|ς field).
Watabe, K.
, Ikegami, T.
, Takamizawa, A.
, Yanagimachi, S.
, Ohshima, S.
and Knappe, S.
(2009),
High-contrast dark resonances with linearly polarized light on the D<sub>1</sub> line of alkali atoms with large nuclear spin, Applied Optics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50667
(Accessed October 15, 2025)