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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Adaptive optical array receivers for detection of surface acoustic waves.

T W Murray¹, H Tuovinen, S Krishnaswamy

¹Center for Quality Engineering and Failure Prevention, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3020, USA.

|March 20, 2008

Summary

Researchers developed adaptive holographic receivers using photorefractive crystals for detecting surface acoustic waves (SAW). These systems offer flexible control over laser power distribution, preventing material damage and enabling tailored detection capabilities.

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Area of Science:

Optics
Materials Science
Acoustics

Background:

Interferometric detection systems are crucial for sensing applications.
Photorefractive crystals offer unique properties for optical signal processing.
Surface acoustic waves (SAW) require sensitive detection methods.

Purpose of the Study:

To configure adaptive interferometric detection systems as distributed optical receivers.
To investigate the spatial distribution of laser power for enhanced detection.
To explore the theoretical and experimental responses of various receiver configurations to SAW.

Main Methods:

Utilizing two-wave mixing in photorefractive crystals.
Employing phase gratings and amplitude masks to control laser power distribution.
Analyzing the responses of point, line, array, and chirped optical receivers to SAW.

Main Results:

Demonstrated the ability to configure adaptive holographic SAW receivers.
Showcased receivers that can be broadband or narrow band.
Proved that receivers can be sensitive to SAW propagation in specific directions.
Validated the distribution of laser power to prevent material damage.

Conclusions:

Adaptive holographic receivers offer versatile detection capabilities for SAW.
Control over laser power distribution enhances system safety and performance.
Tailored receiver configurations enable selective and efficient SAW detection.