We observe the electromagnetically induced transparency (EIT) spectra inside a nitrogen filled Rb vapour cell (Rb-N2) in a five-level Λ-type system of D2 transition of Rb atom. The high contrast EIT resonance in buffer gas filled Rb cell is obtained under our experimental conditions. The effect of velocity changing coherence preserving collisions to obtain the contrast resonance in buffer gas cell has been discussed. We measured the dependence of EIT width and height on pump intensity and find that the EIT width (FWHM) and peak height have a linear dependence on pump intensity. Our experimental results show that the presence of N2 buffer gas reduces the power broadening of the observed resonances. © 2009 Pleiades Publishing, Ltd.

BISWAJIT RAY

Physics

M M HOSSAIN

S MITRA

P N GHOSH

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

High Contrast Electromagnetically Induced Transparency in a Nitrogen Filled Rb Vapour Cell

Laser Physics

We report the experimental observations of double EIT and enhanced EIT signal in a combination of Λ- and V-type multi-level system of the D 2 transition of 85Rb atoms interacting with three laser fields. The EIT formation under a Λ-type and V-type systems is also observed separately. It is found that the EIT width in a V-type system becomes narrower than the Λ-type system. Also the effect of frequency detuning of the control laser on the probe absorption profile is studied in presence of Λ- and V-type EIT systems. © Springer-Verlag 2010.

Applied Physics B: Lasers and Optics

Double EIT and enhanced EIT signal in a combination of Î›- And V-type system of Rb-D2 transition

We report the experimental observation of electromagnetically induced transparency (EIT) in a Doppler broadened rubidium vapour at room temperature for different probe intensities at a fixed pump intensity in a five-level Λ-type system formed by the D2 transition of 85Rb. For a constant pump intensity, we find that the EIT width and height change with the variation of probe intensity. We observe a nonlinear variation of the height of the EIT peak and a linear variation of the width (FWHM) of the EIT signal with probe intensity. In the Doppler broadened multilevel system, we also observe the velocity selective dips along with the EIT signal. A numerical simulation of the probe response signal based on density matrix representation in a five-level system is carried out to reproduce the experimentally observed spectra. © 2009 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.

European Physical Journal D

Study of width and height of EIT resonance in a doppler broadened five-level system with varying probe power

Journal of Physics B: Atomic, Molecular and Optical Physics

Coherent population trapping in a finite-size buffer-less cell

Applied Physics Letters

Laser frequency offset locking using electromagnetically induced transparency

Journal of Modern Optics

Slow light in paraffin-coated Rb vapour cells

Optics Letters

Decoherence of electromagnetically induced transparency in atomic vapor

High contrast electromagnetically induced transparency in a nitrogen filled Rb vapour cell

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ISSN	1054-660X