Acousto-optic signal generation with a nanosecond pulsed laser

S. G. Resink; E. Hondebrink; W. Steenbergen

doi:10.1117/12.2038978

3 March 2014 Acousto-optic signal generation with a nanosecond pulsed laser

S. G. Resink, E. Hondebrink, W. Steenbergen

Proceedings Volume 8943, Photons Plus Ultrasound: Imaging and Sensing 2014; 89434K (2014) https://doi.org/10.1117/12.2038978
Event: SPIE BiOS, 2014, San Francisco, California, United States

Abstract

We show acousto-optic signal generation in tissue like media using a nanosecond pulsed laser for light delivery that has a long coherence length. Our method consists of injecting a light pulse at two different phases of the ultrasound. This enables us to record two different speckle patterns with a camera. When both speckle patterns are recorded within the speckle decorrelation time is it possible to relate both speckle patterns and obtain an acousto-optic signal. We quantify the strength of the acousto-optic effect by adding both speckle patterns and investigate the reduction of speckle contrast of the resulting speckle pattern. We compare the results of this pulsed method with a traditional speckle contrast based acousto-optic experiment by performing a 2d scan on a homogenous sample. Our method makes it possible to obtain acousto-optic signals well within the speckle decorrelation times of typical tissues, making in-vivo possible. Secondly, our method is fully compatible with photo acoustics which can make use of the same laser in the same setup.

Citation Download Citation

S. G. Resink, E. Hondebrink, and W. Steenbergen "Acousto-optic signal generation with a nanosecond pulsed laser", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89434K (3 March 2014); https://doi.org/10.1117/12.2038978

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KEYWORDS

Acousto-optics

Speckle pattern

Speckle

Pulsed laser operation

Ultrasonography

Cameras

Modulation

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