Laser frequency stabilization to excited state transitions using electromagnetically induced transparency in a cascade system

R. P. Abel, A. K. Mohapatra, M. G. Bason, J. D. Pritchard, K. J. Weatherill, U. Raitzsch, C. S. Adams

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We demonstrate laser frequency stabilization to excited state transitions using cascade electromagnetically induced transparency. Using a room temperature Rb vapor cell as a reference, we stabilize a first diode laser to the D 2 transition and a second laser to a transition from the intermediate 5P3/2 state to a highly excited state with principal quantum number n=19-70. A combined laser linewidth of 280±50 kHz over a 100 μs time period is achieved. This method may be applied generally to any cascade system and allows laser stabilization to an atomic reference in the absence of a direct absorption signal.

Original languageEnglish
Article number071107
Number of pages3
JournalApplied Physics Letters
Issue number7
Publication statusPublished - 18 Feb 2009


  • laser spectroscopy
  • laser frequency stabilization
  • linewidths
  • Rydberg states
  • absorption spectroscopy

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