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Suppressing residual amplitude modulation to the 10-7 level in optical phase modulation
Applied Optics
|January 30, 2019
Summary
Wedged electro-optic crystals effectively suppress residual amplitude modulation, a key factor in precision measurements. This study investigates the mechanism, revealing polarization mixture as the cause and achieving low residual amplitude modulation for enhanced frequency stabilization.
Area of Science:
- Precision Measurement
- Optical Physics
- Materials Science
Background:
- Residual amplitude modulation (RAM) degrades stability in precision measurements.
- Electro-optic (EO) crystals are crucial components in many optical systems.
- Suppressing RAM is essential for achieving higher measurement accuracy.
Purpose of the Study:
- Investigate the mechanism of RAM suppression using wedged EO crystals.
- Analyze the factors contributing to RAM in this configuration.
- Evaluate the effectiveness of wedged EO crystals in improving long-term stability.
Main Methods:
- Comparison of RAM in standard and wedged EO crystals.
- Analysis of temperature and polarization dependences of RAM.
- Spatial distribution analysis of RAM.
- Implementation of a Faraday rotator to replace an optical isolator.
Main Results:
- RAM in wedged EO crystals shares temperature and polarization dependences with standard crystals.
- A mixture of orthogonal polarizations in extraordinary light is identified as the RAM source.
- Non-uniform spatial distribution of RAM is observed.
- Replacing the optical isolator with a Faraday rotator improved long-term stability.
- Achieved RAM as low as 2×10-7, enabling frequency instability of 8×10-18.
Conclusions:
- Wedged EO crystals offer an effective method for RAM suppression.
- Understanding the polarization-dependent mechanism allows for further optimization.
- This technique significantly enhances frequency stabilization in precision measurements.
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