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Diffraction of Atomic de Broglie Waves Atom Beam Interferometer Experiments

Atom Optics and Atom Interferometry. Alex Cronin U.A. Physics. Diffraction of Atomic de Broglie Waves Atom Beam Interferometer Experiments. Atom Beam Diffraction. Count Rate. Gratings for Atom Waves. Front View. Support bars. Period = 100 nm. Material: silicon nitride.

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Diffraction of Atomic de Broglie Waves Atom Beam Interferometer Experiments

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  1. Atom Optics and Atom Interferometry Alex Cronin U.A. Physics • Diffraction of Atomic de Broglie Waves • Atom Beam Interferometer Experiments

  2. Atom Beam Diffraction Count Rate

  3. Gratings for Atom Waves Front View Support bars Period = 100 nm Material: silicon nitride

  4. Atom Interferometer

  5. Optical Grating Second Grating

  6. AtomInterferometer • Objective:Pioneer new techniques using matter-wave interference to make precision measurements. • • Study quantum decoherence, • Matter-wave index of refraction, • Atomic polarizability. Approach:3 nano-fabricated diffraction gratings. • Mach-Zhender interferometer for atom-waves.. • Interferometer Performance: • • Up to 50% contrast. • Small phase drift (< 2 rad / hr). • • Layout is easily changed for • new experiments. • Macroscopic (100 mm) path separation.

  7. Decoherence due to Photon Scattering PRL 86: 2191 (2001) • Two interpretations: which-way & phase diffusion • Demonstration of scaling laws • Easy to calculate ab initio (& agrees with experiment)

  8. Contrast vs. Separation (d) Each atom scatters:

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