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Residual amplitude modulation and its mitigation in wedged electro-optic modulator
Optics Express
|March 17, 2019
Summary
Residual amplitude modulation (RAM) is reduced by optimizing electro-optic crystal parameters and beam overlap. Decreasing overlap efficiency significantly lowers RAM, enhancing optical system performance.
Area of Science:
- Optics and Photonics
- Quantum Optics
- Laser Physics
Background:
- Residual amplitude modulation (RAM) is a critical noise source in optical systems, particularly those employing electro-optic crystals (EOCs).
- Understanding the factors influencing RAM is essential for improving signal-to-noise ratios in sensitive measurements.
Purpose of the Study:
- To theoretically analyze and experimentally investigate the factors affecting residual amplitude modulation (RAM).
- To determine the relationship between RAM and key parameters like beam radius, wedge angle, and beam overlap efficiency within an EOC.
Main Methods:
- Theoretical analysis of RAM dependence on EOC parameters.
- Experimental investigation involving measurement of RAM under varying beam radii, wedge angles, and overlap efficiencies.
- Characterization of overlap efficiency based on the distance from the wedge facet to the polarizer.
Main Results:
- RAM exhibits a sinc-like curve, with maximum optical path difference (Δ) at the light spot's edge.
- The magnitude of Δ is directly proportional to the beam radius and the wedge angle of the EOC.
- Reduced overlap efficiency between ordinary and extraordinary beams leads to a significant decrease in RAM.
Conclusions:
- Optimizing the beam radius and wedge angle of the EOC can control RAM.
- Decreasing the overlap efficiency between the extraordinary and ordinary beams is an effective strategy for minimizing RAM.
- These findings provide a pathway for reducing noise and enhancing the performance of optical systems utilizing EOCs.
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