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Cold Beam Optical Clock with Multifrequency Spectroscopy
William G Tobias1,2, Bryan Hemingway2, Steven Peil2
1Computational Physics, Inc., 8001 Braddock Road, Suite 210, Springfield, Virginia 22151, USA.
Physical Review Letters
|February 14, 2025
Summary
We developed a compact optical clock using laser-cooled calcium-40 atoms. This improved atomic clock performance by enhancing fringe amplitude and reducing frequency uncertainty.
Area of Science:
- Atomic Physics
- Optical Clocks
- Spectroscopy
Background:
- Optical clocks require precise atomic interrogation.
- Ramsey-Bordé interferometry is a key technique for atomic clocks.
- Laser cooling significantly enhances atomic sample quality.
Purpose of the Study:
- To demonstrate a compact optical clock using laser-cooled ^{40}Ca.
- To improve the performance of Ramsey-Bordé interferometry in atomic clocks.
- To achieve high precision and stability in an optical clock.
Main Methods:
- Utilizing laser cooling to reduce the velocity of ^{40}Ca atoms.
- Employing Ramsey-Bordé interferometry with a compact setup.
- Implementing tailored phase and intensity modulation for spectroscopy.
Main Results:
- Achieved sub-kHz linewidth fringes due to reduced atomic velocity and temperature.
- Increased Ramsey-Bordé fringe amplitude by a factor of 14.
- Reached an Allan deviation of 3.4×10^{-15} at one second averaging time.
Conclusions:
- Laser-cooled ^{40}Ca beams enable high-performance compact optical clocks.
- Optimized spectroscopy techniques significantly enhance clock signal quality.
- The demonstrated clock shows potential for precise timekeeping and frequency standards.
