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arXiv · 1311.7268

Active narrowband filtering, line narrowing and gain using ladder electromagnetically induced transparency in an optically thick atomic vapour

James Keaveney·Armen Sargsyan·David Sarkisyan·Aram Papoyan·Charles S. Adams
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Abstract

Electromagnetically induced transparency (EIT) resonances using the $5\rm{S}_{1/2}\rightarrow5\rm{P}_{3/2}\rightarrow5\rm{D}_{5/2}$ ladder-system in optically thick Rb atomic vapour are studied. We observe a strong line narrowing effect and gain at the $5\rm{S}_{1/2}\rightarrow5\rm{P}_{3/2}$ transition wavelength due to an energy-pooling assisted frequency conversion with characteristics similar to four-wave mixing. As a result it is possible to observe tunable and switchable transparency resonances with amplitude close to $100\%$ and a linewidth of 15 MHz. In addition, the large line narrowing effect allows resolution of $^{85}$Rb $5\rm{D}_{5/2}$ hyperfine structure even in the presence of strong power broadening.

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James Keaveney, Armen Sargsyan, David Sarkisyan, Aram Papoyan, Charles S. Adams. 2014-01-24. Active narrowband filtering, line narrowing and gain using ladder electromagnetically induced transparency in an optically thick atomic vapour. https://doi.org/10.1088/0953-4075%2F47%2F7%2F075002

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