Effect of residual Doppler averaging on the probe absorption in cascade type system: A comparative study

doi:10.1088/1674-1056/27/9/094204

Abstract

Effect of residual Doppler averaging on the probe absorption in an alkali vapor medium in the presence of a coherent pump beam is studied analytically for the Ξ type system. A coherent probe field is assumed to connect the ground level with the intermediate level whereas a coherent control beam is supposed to act between the intermediate energy level and the uppermost level. Optical Bloch equations (OBE) for a three-level Ξ type system and a four-level Ξ type system are derived by using density matrix formalism. These equations are solved by an analytic method to determine the probe response, which not only depends on the wavelength difference between the control (pump) field and the probe field but shows substantially different features depending on whether the wavelength of the control field is greater than that of the probe field or the reverse. The effect of temperature on probe response is also shown. Enhancement in probe absorption and additional features are noticed under a strong probe limit at room temperature. The four-level Ξ type system has two ground levels and this leads to substantial modification in the simulated probe absorption as compared to the three-level system.

Keywords: cascade type system density matrix method residual Doppler averaging electromagnetically induced transparency (EIT)

Received: 06 April 2018
Revised: 11 June 2018
Accepted manuscript online:

PACS:	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	32.10.Fn	(Fine and hyperfine structure)

Fund:

Project supported by UGC, New Delhi, India.

Corresponding Authors: Suman Mondal, Arindam Ghosh, Amitava Bandyopadhyay
E-mail: mondal.suman27@gmail.com;arindam.ghosh.phy@gmail.com;m2amitava@gmail.com

Cite this article:

Suman Mondal, Arindam Ghosh, Khairul Islam, Dipankar Bhattacharyya, Amitava Bandyopadhyay Effect of residual Doppler averaging on the probe absorption in cascade type system: A comparative study 2018 Chin. Phys. B 27 094204

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Effect of residual Doppler averaging on the probe absorption in cascade type system: A comparative study

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