## Abstract

Many atom interferometer applications would benefit from large angle atomic beamsplitters with narrow distributions. The interaction between a magnetic field and two standing wave laser fields can provide such a beamsplitter. Unfortunately, the required magnetic fields are undesirable in many interferometer applications, and few atomic systems have a suitable transition. We show that a similar beamsplitter for a three level atomic system can be obtained in the absence of a magnetic field as long as the excitation fields interacting with the two transitions are standing waves with a differential detuning. This technique could be used on transitions other than J = 1 to J′ = 1. Consider a three state system in the basis |a〉, |e〉, |b〉, where the field with rabi frequency Ω_{a}(Ω_{b}) interacts only with the transition from |a〉 → |e〉(|b〉 → |e〉). For Ω_{a} = Ω_{b}, and φ = π/2, the eigenenergies of H as a function of z are shown in Fig. 1. For states which approach |a〉 and |b〉 when |Ω| → 0, the potentials are given by ± (Δ/2 + |sin(kz)|). In contrast, the state which approaches |e〉 when |Ω| → 0, has a nearly triangular potential. Figure 2 shows the theoretical momentum distribution for scattering of a mono-energetic atomic beam where all atoms are in |e〉 initially and the interaction time is t = (7.5)(2π)/Δ. The narrowness of these peaks even at large values of the momentum splitting are the most important feature of this technique. The vertical lines in Fig. 3 show preliminary experimental results for an effusive He beam using the J = 1 to J′ = 1 subsystem of the 2S_{1} ^{3} to 2^{3}P_{1} transition in He, excited by a σ_{+} polarized standing wave and a σ _{-} polarized standing wave. In the experiment the initial populations were evenly distributed among the three ground states and the transverse momentum distribution was ± ℏk.

Original language | English (US) |
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Title of host publication | Proceedings of the International Quantum Electronics Conference (IQEC'94) |

Publisher | Publ by IEEE |

Pages | 35-36 |

Number of pages | 2 |

ISBN (Print) | 0780319737 |

State | Published - Dec 1 1994 |

Event | Proceedings of the 21st International Quantum Electronics Conference (IQEC'94) - Anaheim, CA, USA Duration: May 8 1994 → May 13 1994 |

### Other

Other | Proceedings of the 21st International Quantum Electronics Conference (IQEC'94) |
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City | Anaheim, CA, USA |

Period | 5/8/94 → 5/13/94 |

## ASJC Scopus subject areas

- Engineering(all)