Spectroscopy of Potassium Rydberg States via Electromagnetically Induced Transparency

Xue-Dong Tian, Yi-Mou Liu, Xiao-Bo Yan +2 more

James P. Shaffer, Harold K ubler, T. Baluktsian +4 more

Yağız Oyun

Wenchao Xu, Brian DeMarco

We demonstrate a velocity selection scheme that mitigates suppression of electromagnetically induced transparency (EIT) by Doppler shifts for coupling wavelengths larger than the probe wavelength. An optical pumping beam counterpropagating with the EIT probe beam transfers atoms between hyperfine states in a velocity-selective fashion. Measurement of the transmitted probe beam synchronous with chopping of the optical pumping beam enables a Doppler-free EIT signal to be detected. Transition frequencies between $5{P}_{1/2}$ and $n{S}_{1/2}$ states for $n=26$, 27, and 28 in $^{39}\mathrm{K}$ are obtained via EIT spectroscopy in a heated vapor cell with a probe beam stabilized to the $4{S}_{1/2}\ensuremath{\rightarrow}5{P}_{1/2}$ transition. Using previous high-resolution measurements of the $4{S}_{1/2}\ensuremath{\rightarrow}n{S}_{1/2}$ transitions, we make a determination of the absolute frequency of the $4{S}_{1/2}\ensuremath{\rightarrow}5{P}_{1/2}$ transition. Our measurement is shifted by 560 MHz from the currently accepted value with a twofold improvement in uncertainty. These measurements will enable novel experiments with Rydberg-dressed ultracold Fermi gases composed of $^{40}\mathrm{K}$ atoms.

S Mauger, James Millen, M P A Jones

We report on the all-optical detection of Rydberg states in an effusive atomic beam of strontium atoms using electromagnetically induced transparency (EIT). Using narrow-linewidth CW lasers we obtain an EIT linewidth of 5 MHz. To illustrate the high spectroscopic resolution offered by this method, we have measured isotope shifts of the 5s18d 1 D 2 and 5s19s 1 S 0 Rydberg states. This technique could be applied to high-resolution, non-destructive measurements of ultra-cold Rydberg gases and plasmas.

Lu Ma, David Alexander Anderson, Rachel Sapiro +1 more