Hyperfine Interactions and Electric Dipole of Cs 11s by Using Electromagnetically Induced Transparency

Using electromagnetically induced transparency, the hyperfine structure of the 11s state of cesium was measured and analyzed. To improve the accuracy of frequency measurement, a reference probe beam produced from an acousto-optical modulator overlapped with the original probe beam was served as a frequency marker. The hyperfine magnetic dipole constant A of Cs 11s can be derived from the splitting intervals of the observed spectrum. The result is A\,=\,38.83$\pm$0.26\,MHz. A numerical simulation based on solving the steady state density matrix solution involving dressed-state atom-photon interaction picture, multi-intermediate levels and optical pumping can quantitatively fit the experimental data.