Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles

  title={Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles},
  author={Tzu-Ling Chen and Shaojie Chang and Yi-Jan Huang and Khemendra Shukla and Yao-Chin Huang and Te-Hwei Suen and Tzu-Yung Kuan and J. T. Shy and Yi-Wei Liu},
  journal={arXiv: Atomic and Molecular Clusters},
We present experimental results on the sub-Doppler Rydberg spectroscopy of potassium in a hot cell and cold atoms, performed with two counter-propagating laser beams of 405 nm and 980 nm in the inverted ladder-type system (4S1/2-5P3/2-nS1/2 and nD3/2;5/2). Such an inverted ladder type scheme is predicted to be without sub-Doppler electromagnetically induced transparency (EIT) feature in a thermal ensemble under the weak-probe approximation. Instead, we chose a strong probe field beyond the weak… 
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