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首页> 外文期刊>Applied Spectroscopy: Society for Applied Spectroscopy >The Effect of Standing Acoustic Waves on the Formation of Laser-Induced Air Plasmas
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The Effect of Standing Acoustic Waves on the Formation of Laser-Induced Air Plasmas

机译：驻波对激光诱导的空气等离子体形成的影响

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摘要

The expected location of an air plasma produced by a focused YAG laser pulse has been found to be influenced by the acoustics of the surrounding environment. In open air, the expected location of a laser-induced air plasma is centered close to the focal point of the lens focusing the laser beam. When confining the same beam coaxially along the interior of a quartz tube, the expected location of the air plasma shifts away from the focal point, toward the focusing lens, in a region of less laser fluence. This shift is caused by an interaction between standing acoustic waves (formed from sound waves produced by previous laser-induced plasmas) and the impinging laser pulse. Standing acoustic waves in a tube produce areas (antinodes) of slightly higher and slightly lower pressure than ambient atmospheric conditions, that in turn have a noticeable affect on the probability of creating an air plasma at a given location. This leads to two observed phenomena: Increased probability of air plasma formation before the optical focal point is reached, and the formation of distinct (separate) air plasmas at the antinodes themselves.
机译：已经发现由聚焦的YAG激光脉冲产生的空气等离子体的预期位置受周围环境的声学影响。在露天环境中，激光诱导的空气等离子体的预期位置位于靠近聚焦激光束的透镜焦点的中心。当沿石英管的内部同轴限制同一光束时，空气等离子体的预期位置在激光通量较小的区域内从焦点移向聚焦透镜。这种偏移是由驻波声波（由先前的激光诱导的等离子体产生的声波形成）和入射激光脉冲之间的相互作用引起的。管中的驻声波产生的区域（波腹）的压力要比周围环境的压力略高，而压力略低，这反过来对在给定位置产生空气等离子体的可能性有明显的影响。这导致了两个观察到的现象：在到达光学焦点之前形成空气等离子体的可能性增加，并且在波腹本身处形成了不同的（分离的）空气等离子体。

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