Eur. Phys. J. D (2017) 71: 38
https://doi.org/10.1140/epjd/e2017-70676-x

Regular Article

Coherent population trapping (CPT) versus electromagnetically induced transparency (EIT)

Department of Physics, Indian Institute of Science, 560 012 Bangalore, India

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Received: 1 November 2016
Received in final form: 26 December 2016
Published online: 16 February 2017

Abstract

We discuss the differences between two well-studied and related phenomena – coherent population trapping (CPT) and electromagnetically induced transparency (EIT). Many differences between the two – such as the effect of power in the beams, detuning of the beams from resonance, and the use of vapor cells filled with buffer gas – are demonstrated experimentally. The experiments are done using magnetic sublevels of the 1 → 1 transition in the D₂ line of ⁸⁷Rb.