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A review of acoustooptical deflection and modulation devices
1Bell Telephone Laboratories, Inc., Murray Hill, NJ, USA.
Applied Optics
|January 9, 2010
Summary
This review details acousto-optical device principles, showing how acoustic power and optical bandwidth trade-off for efficient light scattering and modulation. This aids in determining power needs for acousto-optical devices.
Area of Science:
- Physics
- Optics
- Acoustics
Background:
- Acousto-optical devices manipulate light using sound waves.
- Understanding the interplay between optical and acoustic properties is crucial for device design.
Purpose of the Study:
- To review the fundamental principles of acousto-optical devices.
- To establish relationships between device parameters for optimized performance.
Main Methods:
- Review of momentum conservation principles applied to acousto-optical interactions.
- Detailed calculation of acoustic amplitude modulation.
- Analysis of acoustic deflection with beam focusing and scanning.
Main Results:
- Identified optimum relationships between optical and acoustic beam dimensions for scanning and modulation.
- Derived a key relationship: scattered light fraction times bandwidth equals a material constant times acoustic power.
- Demonstrated validity of simple momentum considerations through detailed calculations.
Conclusions:
- The derived relationship simplifies determining modulation power for acousto-optical devices.
- Provides a framework for understanding trade-offs between scattering efficiency and bandwidth.
- Offers insights into acoustic deflection mechanisms in various configurations.
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