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Laser system for frequency domain velocimetry and atom interferometry experiments.

J Randhawa1, G Carlse1, M B Llaguno1

  • 1Department of Physics and Astronomy, York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada.

The Review of Scientific Instruments
|December 19, 2025
PubMed
Summary
This summary is machine-generated.

We developed a stable laser system for cold-atom experiments, improving temperature control in magneto-optical traps (MOT) and enabling precise measurements for velocimetry and gravity. This system offers enhanced stability for advanced atomic physics research.

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Area of Science:

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

Background:

  • Magneto-optical traps (MOTs) are crucial for laser-cooling atoms.
  • Traditional laser stabilization methods can be complex and introduce noise.
  • Precise control over laser frequency and intensity is essential for advanced atomic measurements.

Purpose of the Study:

  • To characterize and specify a home-built external cavity diode laser system.
  • To enable frequency-domain cold-atom velocimetry and gravitational acceleration measurements.
  • To demonstrate a stable, versatile laser source for atomic physics applications.

Main Methods:

  • Frequency stabilization using a modulation-free technique.
  • Intensity stabilization via an acousto-optic modulator feedback loop.
  • Integration with a dual-output radio frequency synthesizer for controlled laser detuning.

Main Results:

  • The modulation-free technique achieved lower magneto-optical trap temperatures compared to lock-in spectroscopy.
  • Intensity stabilization reduced sensitivity to low-frequency vibrations.
  • The system generated two laser beams with mHz to MHz detuning range and 10 μHz stability.

Conclusions:

  • The developed laser system is well-suited for high-precision cold-atom measurements.
  • The modulation-free stabilization and intensity control offer significant advantages.
  • This system provides a robust platform for frequency-domain interferometry with laser-cooled atoms.