Optical pumping and electromagnetically induced transparency in a lithium vapour

Abstract

We report the first study of electromagnetically induced transparency (EIT) on the D1 and D2 lines of 7 Li in a vapour cell. The effect of different polarizations, background gas pressures and experimental designs on the dark resonance are examined. It is found that EIT is more prominent on the D1 line than on the D2 line and is present at the D2 transition under incident orthogonal linearly polarized fields and parallel circularly polarized fields, but absent for parallel linearly polarized fields and for orthogonal circularly polarized fields. It is shown that the contrast of the dark resonances can be affected by the presence of an inert background gas. An analysis of a further nine resonances observed at the D1 transition and three resonances at the D2 transition is presented.

Vibrational relaxation of highly excited CO molecules on CO2molecules in the active medium of a CO laser

“…This is due to destructive excitations via cycling transitions which do not contribute to the preparation of dark coherent states. This is in agreement with the results of Stähler et al (2002) and Magnus et al (2005) which show greater contrast in the dark resonance in the D1 line than the D2 line of 85 Rb and 7 Li, respectively. It is difficult to compare the width of the EIT resonances obtained for both lines because any ambient magnetic field can introduce additional broadening.…”

“…Lithium has two stable isotopes, 6 Li and 7 Li (7.5% and 92.5% natural abundance, respectively). Magnus et al (2005) reported the first study of EIT on the D1 and D2 lines of 7 Li in a vapour.…”

Analytical Solutions of Temporal Evolution of Populations in Optically-Pumped Atoms with Circularly Polarized Light

“…This phenomenon is called optical pumping, which is widely used in the preparation of internal atomic states of interest [1,2]. It has recently been observed that optical pumping affects the lineshapes in saturated absorption spectroscopy (SAS) [3], electromagnetically induced transparency (EIT) [4], and absorption of cold atoms with a Λ-type three-level scheme [5]. Nonlinear effects in optical pumping have also been investigated [6,7].…”

Influence of multiple excited states on optical properties of an -type Doppler-broadened system for the D2 line of alkali atoms

“…We consider three different alkali atoms which are rubidium, sodium and lithium. There are many studies in which a EIT-system has been investigated for the D2 line of Rb [40,44], Na [12,45] and Li [46,47]. For an N-type configuration, to make our model similar in all cases, we consider these atoms with a nuclear spin I = 3/2, i.e.…”