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Related Experiment Videos

Reducing the first-order Doppler shift in a Sagnac interferometer.

S Hannemann1, E J Salumbides, W Ubachs

  • 1Laser Centre, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, Amsterdam, The Netherlands. shannemann@gmail.com

Optics Letters
|June 5, 2007
PubMed
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We developed a Sagnac interferometer technique to minimize Doppler shifts in atomic and laser beam experiments. This method enhances precision frequency calibration for deep-UV spectroscopy, achieving 6 x 10(-10) accuracy.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Laser Spectroscopy
  • Quantum Metrology

Background:

  • First-order Doppler shifts limit precision in atomic and molecular spectroscopy.
  • Accurate frequency calibration is crucial for fundamental physics studies and technological applications.
  • Crossed atomic/molecular and laser beam experiments are susceptible to Doppler broadening.

Purpose of the Study:

  • To demonstrate a novel technique for reducing first-order Doppler shifts in crossed beam experiments.
  • To implement this technique for high-precision frequency calibration in the deep-ultraviolet (deep-UV) spectral region.
  • To assess the achievable precision and identify limitations.

Main Methods:

  • Utilizing a Sagnac interferometer to align two counterpropagating laser beams.

Related Experiment Videos

  • Observing interference fringes to detect deviations from perfect antiparallelism.
  • Applying the method to Ytterbium (Yb) at 199 nm and Krypton (Kr) at 212 nm transitions.

    • Main Results:

    • Successfully reduced first-order Doppler shifts in crossed atomic/molecular and laser beam setups.
    • Achieved a precision of 6 x 10(-10) in frequency calibration.
    • Demonstrated the method's effectiveness for both one- and two-photon excitation schemes.

    Conclusions:

    • The Sagnac interferometer technique offers a robust way to minimize Doppler shifts.
    • This method enables high-precision frequency metrology in the deep-UV range.
    • Laser system characteristics currently limit the ultimate precision of the technique.