Coherent Population Trapping in An Inhomogeneously Broadened \(\Lambda\)-System with Multiple Excited States

Authors

  • Paramjit Kaur Indian Institute of Technology, Roorkee; Guru Nanak Dev University, Amritsar
  • Ajay Wasan Indian Institute of Technology, Roorkee

DOI:

https://doi.org/10.26713/jamcnp.v3i2.464

Keywords:

Coherent population trapping, Doppler-broadened system, Transparency window, Absorption and multiple excited states

Abstract

We present a theoretical model using density matrix approach to study the phenomenon  of coherent population trapping (CPT) in the \(\Lambda\)-type Doppler broadened system with multiple excited states. A multi-level \(\Lambda\)-system is formed by considering the closely spaced hyperfine levels in the D2 line of \(^{87}\)Rb. The presence of closely spaced hyperfine levels affects the transparency window and cause asymmetry in absorption profiles. We observe the  sharp CPT dip when the frequency difference of applied fields is equal to the frequency separation between two ground levels. This dip demonstrates that the system is trapped in the dark state. By performing a thermal averaging in the Doppler-broadened \(\Lambda\)-system, we have shown that the transparency window  becomes narrower and its linewidth decreases at higher temperature. This study has potential applications in precision measurements due to the small linewidth of the transparency window.

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References

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Published

2016-07-30
CITATION

How to Cite

Kaur, P., & Wasan, A. (2016). Coherent Population Trapping in An Inhomogeneously Broadened \(\Lambda\)-System with Multiple Excited States. Journal of Atomic, Molecular, Condensed Matter and Nano Physics, 3(2), 81–88. https://doi.org/10.26713/jamcnp.v3i2.464

Issue

Vol. 3 No. 2 (2016)

Section

Research Article

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