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Reference.org
Acousto-optics
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<p>Acousto-optics is a branch of <a href="/facts/Physics/a7aH2y08">physics</a> that studies the interactions between sound waves and light waves, especially the <a href="/facts/Diffraction/Mk80xXHT">diffraction</a> of <a href="/facts/Laser/jk6PTvvT">laser</a> <a href="/facts/Light/jeofpMn4">light</a> by <a href="/facts/Ultrasound/31Pa5IH9">ultrasound</a> (or <a href="/facts/Sound/DlKXlPuF">sound</a> in general) through an <a href="/facts/Ultrasonic_grating/hn32yJeU">ultrasonic grating</a>. </p>