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Updated: Feb 14, 2026

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations

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De-coupling the Coriolis effect from Raman beams alignment in a fountain atom gravimeter.

Qin Luo¹, Hang Zhou¹, Li Li¹

¹National Gravitation Laboratory, MOE Key Laboratory of Fundamental Physical Quantities Measurement, and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

The Review of Scientific Instruments

|February 13, 2026

Summary

A new method for aligning Raman beams in atom interferometry gravimeters eliminates Coriolis effect errors. This technique significantly improves precision for gravity measurements by reducing alignment uncertainty.

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Area of Science:

Atomic physics
Precision measurement
Gravimetry

Background:

Accurate Raman beam alignment is critical for high-precision atom interferometry gravimeters.
Tilt modulation experiments, commonly used for calibration, can be affected by the Coriolis effect, introducing alignment deviations.

Purpose of the Study:

To propose and experimentally validate a method to eliminate the Coriolis effect's impact on Raman beam alignment.
To enhance the precision of fountain atom gravimeters.

Main Methods:

A novel approach involving rotating the sensor head by 90° was developed.
Experimental demonstration of the proposed method in a fountain atom gravimeter.

Main Results:

The alignment uncertainty of Raman beams was reduced to 11 μrad.
This resulted in a gravity measurement uncertainty of less than 0.1 μGal.

Conclusions:

The 90° sensor head rotation effectively eliminates Coriolis effect deviations in Raman beam alignment.
The method significantly improves the precision of atom interferometry gravimeters and offers insights for further reducing Coriolis effects.