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Bulletin of the American Physical Society

Efficient Rydberg Excitation of He with STIRAP

S. H. Lee, Kyung Soo Choi, J. Kaufman, Andreas Vernaleken, Oleg Kritsun, H. Metcalf

Published May 19, 2006• 1 citation
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We have set up a STIRAP excitation mechanism for helium from the metastable 23S state into Rydberg states, via the intermediate level 33P . A uv laser at 389 nm and an ir laser at 780-815nm are used as the pump and Stokes beams respectively. Our purposes is to examine how well STIRAP works to efficiently produce the Rydberg atoms, and also to apply STIRAP for further coherent manipulations of helium. To examine the efficiency of the STIRAP process, we use the state selectivity of the light force on atoms to physically separate atoms with different internal states. We use the bichromatic force on a transition different from those used for Rydberg excitation. We do not measure an excitation efficiency close to the ~100% theoretical optimum but instead only about 50%. To gain more insight into this coherent process, an excitation path interferometer is envisioned that showes the expected interference, via the final population of the Rydberg level.

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Efficient Rydberg Excitation of He with STIRAP*

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The ∼100% efficiency of STIRAP is used to produce Rydberg He atoms in a slightly supersonic beam. We focus the atoms with a hexapole electrostatic lens and calibrate the Rabi frequency with the Autler-Townes effect.

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Coherent Excitation of Rydberg States

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We have set up a STIRAP excitation mechanism for helium from the metastable 23S state into Rydberg states, via the intermediate level 33P . A uv laser at 389 nm and an ir laser at 780-815nm are used as the pump and Stokes beams respectively. Our purposes is to examine how well STIRAP works to efficiently produce the Rydberg atoms, and also to apply STIRAP for further coherent manipulations of helium. To examine the efficiency of the STIRAP process, we use the state selectivity of the light force on atoms to physically separate atoms with different internal states. We use the bichromatic force on a transition different from those used for Rydberg excitation. We do not measure an excitation efficiency close to the ~100% theoretical optimum but instead only about 50%. To gain more insight into this coherent process, an excitation path interferometer is envisioned that showes the expected interference, via the final population of the Rydberg level.