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Distributed quasi-Bragg beam splitter in crossed atomic waveguides.

V Guarrera1,2, R Moore3,4, A Bunting3

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This summary is machine-generated.

We developed a novel quasi-Bragg splitter for cold atoms using crossed optical waveguides. This device can split atomic flux into two equal parts, crucial for atom interferometry applications.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Condensed matter physics

Background:

  • Cold atoms are essential for quantum technologies.
  • Optical waveguides provide precise control over atomic trajectories.
  • Atom interferometry requires precise splitting of atomic beams.

Purpose of the Study:

  • To experimentally and theoretically investigate a novel distributed quasi-Bragg splitter for cold atoms.
  • To explore the regimes of atomic flux deflection in crossed optical waveguides.
  • To assess the splitter's suitability for atom interferometry.

Main Methods:

  • Utilizing crossed red-detuned laser beams to form optical waveguides.
  • Employing the resulting optical lattice as a quasi-Bragg splitter.
  • Analyzing atomic flux deflection and momentum distribution through experimental diagnostics and numerical simulations.

Main Results:

  • Observed three distinct regimes of atomic reflection (none, partial, full) based on confinement and velocity.
  • Identified conditions for splitting atomic clouds into two equally populated fragments in the high-velocity regime.
  • Demonstrated control over reflected and transmitted atom fractions by tuning lattice height.
  • Confirmed the creation of a quasi-Bragg splitter occupying mainly two momentum states.

Conclusions:

  • The novel quasi-Bragg splitter effectively controls cold atom flux in crossed optical waveguides.
  • The high-velocity regime is optimal for creating equally populated atomic fragments for atom interferometry.
  • The observed behavior aligns with theoretical band structure analysis and numerical simulations.