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Laser-induced cavitation bubble reconstruction based on the Fresnel optical propagation

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Cavitation bubbles in distilled water were induced by tightly focusing 9ns laser pulses. For the purpose of detection and monitoring of such cavitation bubbles, a direct light transmission technique is used, referred to as Spatial Transmission Modulation (STM), which uses a nearly collimated beam of light passing through the sample at the point where the cavitation bubble is formed. The presence of the cavitation bubble modifies the direct light transmission, which is observed as an electrical signal response with an oscilloscope. A high-speed video camera simultaneously records the cavitation event. In order to reconstruct the cavitation bubble radius dynamics with a high temporal resolution, an algorithm based on the Fresnel optical propagation method is proposed and described in this work.

© 2014 Optical Society of America

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