Collimated UV light generation by two-photon excitation to a Rydberg state in Rb vapor

@article{Lam2019CollimatedUL,
  title={Collimated UV light generation by two-photon excitation to a Rydberg state in Rb vapor},
  author={Mark Lam and Sambit Bikas Pal and Thibault Vogt and Christian Gross and Martin Kiffner and Wenhui Li},
  journal={Optics Letters},
  year={2019},
  volume={44},
  pages={2931-2934}
}
We use two continuous-wave laser beams of 780 nm and 515 nm to optically drive Rb85 atoms in a heated vapor cell to a low-lying Rydberg state 10D5/2. We observe a collimated ultraviolet (UV) beam at 311 nm, corresponding to the transition frequency from the 11P3/2 state to the 5S1/2 state. This indicates the presence of a coherent four-wave mixing process, built up by two input laser fields as well as terahertz (THz) radiation of 3.28 THz, which is generated by amplified spontaneous emission… Expand
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