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Related Experiment Video

Updated: Jul 8, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

Two-dimensional control of optical spatial coherence by acoustooptic interactions.

Y Ohtsuka¹, Y Nozoe

¹Hokkaido University, Faculty of Engineering, Department of Engineering Science, Sapporo, Hokkaido 060, Japan.

|November 15, 1983

Summary

This study introduces a novel method for controlling spatial coherence using multiple ultrasonic waves. The technique allows for precise 2-D spatial coherence modification, with results varying periodically in space but remaining uniform azimuthally.

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Area of Science:

Acoustics
Wave physics
Optics

Background:

Spatial coherence is crucial in various wave-based applications.
Controlling spatial coherence often requires complex setups.
Existing methods may lack precise 2-D control capabilities.

Purpose of the Study:

To present a new method for two-dimensional (2-D) control of spatial coherence.
To investigate the use of multiple, crossing ultrasonic waves for coherence modification.
To analyze the spatial and azimuthal uniformity of the coherence modification factor.

Main Methods:

Employing multiple ultrasonic waves with differing frequencies.
Arranging ultrasonic waves in orthogonal and three symmetric directions.
Analyzing the coherence modification factor as a product of individual factors.
Conducting experimental validation of the proposed arrangements.

Main Results:

Demonstrated 2-D spatial coherence control using intersecting ultrasonic fields.
The coherence modification factor exhibited periodic spatial variation.
Azimuthal uniformity was observed for specific two-point separations relative to wavelength.
The combined effect of multiple ultrasonic waves followed a multiplicative model.

Conclusions:

The described method offers effective 2-D spatial coherence control.
The arrangement of ultrasonic waves significantly influences coherence modification.
The findings have implications for applications requiring precise control of wave coherence.