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A fibered laser system for the MIGA large scale atom interferometer.

D O Sabulsky1, J Junca1,2, G Lefèvre1

  • 1LP2N, Laboratoire Photonique, Numérique et Nanosciences, Université Bordeaux-IOGS-CNRS:UMR 5298, rue F. Mitterrand, F-33400, Talence, France.

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Summary

A new compact fiber laser system reliably produces optical frequencies for Rubidium-87 atom manipulation in quantum technologies. This autonomous device ensures stability and flexibility for demanding environments like the underground MIGA experiment.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Technologies
  • Laser Physics

Background:

  • Emerging quantum technologies rely on precise control of atomic species like Rubidium-87.
  • Underground facilities such as the Laboratoire Souterrain à Bas Bruit (LSBB) present unique environmental challenges for sensitive equipment.
  • The MIGA project requires a robust laser system for its large-scale underground atom interferometer.

Purpose of the Study:

  • To design, realize, and characterize a compact, autonomous fiber laser system for Rubidium-87 atom manipulation.
  • To ensure the laser system's reliability, stability, remote control, and flexibility for the MIGA experiment's challenging environment.
  • To validate the laser system's performance against the requirements for atom interferometry.

Main Methods:

  • Utilizing four frequency-agile, C-band Telecom diode lasers frequency-doubled to 780 nm.
  • Implementing frequency stabilization using saturated absorption and lock-in amplification for an optical frequency reference.
  • Employing optical phase-locked loops to synchronize three lasers to the reference laser.
  • Integrating custom micro-optic splitter/combiners for power and polarization control, including acousto-optic modulators and shutters.

Main Results:

  • Demonstration of a compact and autonomous fiber laser system meeting laboratory-grade performance.
  • Characterization confirming high power, polarization, and frequency stability.
  • Successful operation within the challenging underground environment of the LSBB.
  • Validation of the system's suitability for the MIGA atom interferometer project.

Conclusions:

  • The developed fiber laser system is a reliable and flexible solution for laser cooling, trapping, and manipulation of Rubidium-87 atoms.
  • The system's robust design and performance characteristics make it suitable for demanding applications in quantum technologies and underground experiments.
  • The laser system successfully meets all requirements for the realization of the MIGA underground atom interferometer antenna.