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Updated: Jun 16, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Published on: May 11, 2014

Broadband acoustooptic deflectors: new results.

|February 6, 2010

Summary

This study introduces a novel broadband acoustooptic Bragg deflector with a flat transducer. This design simplifies fabrication and achieves over four times the bandwidth of conventional deflectors.

Area of Science:

Optics and Photonics
Materials Science
Acoustics

Background:

Conventional acoustooptic (AO) Bragg deflectors utilize stepped acoustic gratings for beam steering.
Fabrication challenges and limitations exist for stepped gratings, especially at higher frequencies (>100 MHz).

Purpose of the Study:

To describe a new broadband AO Bragg deflector employing acoustic beam steering.
To present an alternative fabrication method using a flat transducer array.
To analyze the bandwidth enhancement achieved by the novel design.

Main Methods:

A flat piezoelectric transducer grating was fabricated on the AO medium.
Interdigitated electrode configurations created spatially periodic phase variations for acoustic steering.
Theoretical analysis was performed to predict bandwidth improvements.

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Experimental validation was conducted using lead molybdate deflectors.

Main Results:

The new deflector design simplifies fabrication compared to stepped arrays.
A fourfold increase in half-power bandwidth was theoretically predicted.
Experimental results confirmed the predicted fourfold bandwidth improvement.
Reduced acoustic power for diffraction was noted but outweighed by fabrication ease.

Conclusions:

The novel flat transducer AO Bragg deflector offers significant bandwidth advantages.
Simplified fabrication makes this design suitable for high-frequency applications.
This technology advances broadband acoustooptic device capabilities.