Time dependent fluorescence spectrum of a three-level Λ system under electromagnetically induced transparency and coherent population trapping

Abstract

We investigate theoretically the time dependent fluorescence spectra (TDFS) of a three-level system in electromagnetically induced transparency (EIT) and coherent population trapping (CPT) configurations. Time dependent fluorescence intensities of Rayleigh and Stokes transitions are studied as a function of the ground state coherence relaxation rate and initial state preparation, and their correlation with the temporal evolution of dark and bright states is established. Linewidths of fluorescence and absorption are compared in different regimes of relaxation rates. The results are used to discuss the characteristic features of EIT and CPT in the domain of fluorescence spectroscopy.

KEYWORDS:

• Time dependent fluorescence spectrum
• coherent population trapping
• electromagnetically induced transparency
• dark state
• bright state

Acknowledgement

Authors acknowledge funding from Industrial Research & Consultancy Centre (IRCC), Indian Institute of Technology Bombay.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Industrial Research and Consultancy Centre (IRCC), Indian Institute of Technology Bombay.