2013/11/30 by James Keaveney, Armen Sargsyan, David Sarkisyan +2 · 1 citation
Physics and Astronomy · #physics.atom-ph #physics.optics #quant-ph
paper · pdf · doi:10.1088/0953-4075/47/7/075002
arxiv created 2014/01/24 · arxiv updated 2014/07/10
Electromagnetically induced transparency (EIT) resonances using the 5\rmS1/2→5\rmP3/2→5\rmD5/2 ladder-system in optically thick Rb atomic vapour are studied. We observe a strong line narrowing effect and gain at the 5\rmS1/2→5\rmP3/2 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 85Rb 5\rmD5/2 hyperfine structure even in the presence of strong power broadening.