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Laser power stabilization using conservation law in acoustic optic modulator.

Erwei Li^1,2, Qianjin Ma¹, Weiyu Wang^1,2

¹National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, Shaanxi, China.

Scientific Reports

|August 10, 2025

Summary

This study introduces a novel laser power stabilization technique using an acoustic optic modulator (AOM). The method significantly reduces laser power noise, enhancing precision for applications like atomic clocks and interferometers.

Keywords:

Acoustic optic modulator Conservation law Laser power stabilization

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Area of Science:

Physics
Optics
Precision Engineering

Background:

Laser power stability is critical for precision instruments relying on atom-laser interactions.
Existing methods for laser power stabilization can be complex or inefficient.

Purpose of the Study:

To demonstrate an alternative active control method for laser power stabilization.
To improve the stability of laser power for applications in precision instruments.

Main Methods:

Utilizing the conservation law within an acoustic optic modulator (AOM).
Dynamically adjusting the first-order beam power to counteract total power fluctuations.
Stabilizing the zeroth-order beam as the difference term.

Main Results:

Relative power noise of the controlled beam reduced by a factor of 200.
Achieved relative power noise of [Formula: see text] at [Formula: see text] Hz.
Relative power instability of 3.28[Formula: see text] at 500 s averaging time (Allan deviation).

Conclusions:

The AOM-based method provides effective laser power stabilization.
This technique offers high availability of the total power source.
The method is highly applicable to atomic clocks, laser interferometers, and gyroscopes.