title: High-contrast dark resonances with linearly polarized light on the D1 line of alkali atoms with large nuclear spin.
abstract: High-contrast coherent population trapping signals were observed on the Cs D1 line by use of a bichromatic linear polarized light (lin‖lin field). A maximum absorption contrast of about 10% was obtained. This was nearly twice as high as that measured with the standard configuration of bichromatic circularly polarized light (σ-σ field). The results are compared with density matrix calculations of 4 and 5 level systems.
authors.affiliation: National Metrology Institute of Japan (NMIJ), Advanced Industrial Science and Technology, Ibaraki, Japan. k.watabe@aist.go.jp
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Watabe
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ikegami
authors.forename: Akifumi
authors.initials: A
authors.lastname: Takamizawa
authors.forename: Shinya
authors.initials: S
authors.lastname: Yanagimachi
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Ohshima
authors.forename: Svenja
authors.initials: S
authors.lastname: Knappe