Abstract
To study laser-induced breakdown plasma, time-resolved emission spectra from the plasma in air at atmospheric pressure were measured in the perpendicular direction to the laser axis using a streak camera and Cassegrain optics. In the time-resolved spectra, the continuous spectra were observed twice during a single breakdown in a weak-emission area. In addition, the temporal delay of the second continuous spectra increased as the measurement position in the plasma moved away from the center. We concluded that the second continuous spectra originated from the reheating of the plasma by the propagation of the shockwave that was generated in the laser-induced breakdown plasma. Our result shows that the ultrafast interaction between laser-induced plasmas and shockwaves can be investigated using this experimental setup.
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