Abstract
High-speed photography method is employed to study underwater laser propulsion using targets with and without cavity as well as the effect of the cavity depth. The shapes and motions of bubbles generated from the target tail by Nd: YAG laser are recorded by high-speed camera. Then, the influence of different bubble shapes on the laser propulsion is analyzed. Besides, the velocity and momentum coupling coefficient of the targets are investigated. The results show that the bubble is hemispherical in the case of target without cavity, while it is toroidal in the case of target with cavity. Experiments verify that compared with hemispherical bubble, the toroidal bubble is more conducive to laser propulsion in water, which means the target with cavity obtains more momentum than the target without cavity. In addition, the momentum coupling coefficient increases with laser energy first, and then it levels out and decreases a bit for the target with cavity. There is little effect of the cavity depth on propulsion.
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