3 March 2014 Acousto-optic signal generation with a nanosecond pulsed laser
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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.
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S. G. Resink, E. Hondebrink, 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); doi: 10.1117/12.2038978; https://doi.org/10.1117/12.2038978
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