Aiming at significant enhancement of laser cleaning efficiency and productivity, we studied several typical experimental cases including removal of contaminated layers from absorbing surfaces, paying special attention to elimination of the thick rusty layers, and removal of absorbing coatings from transparent substrates. Nanosecond pulses of Nd:YAG laser were used in all the cases at variation of the mode content of the laser beam which was achieved by applying a multimode fiber delivery of radiation. Both, air and water ambient were used in the experiments. The results are discussed in terms of plasma microexplosions in the domain of the substrate–layer interface and the vapor bubbles formation inside the thick rusty layer impregnated with liquid.

中文翻译：

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使用多模短脉冲辐射优化激光清洁条件

为了显着提高激光清洗效率和生产率，我们研究了几个典型的实验案例，包括去除吸收表面的污染层，特别注意去除厚锈层，去除透明基板上的吸收涂层。Nd:YAG 激光的纳秒脉冲用于所有情况下，通过应用多模光纤传输辐射来改变激光束的模式含量。在实验中使用空气和水环境两者。讨论了基板-层界面区域中的等离子体微爆炸和浸渍有液体的厚锈层内部的蒸汽气泡形成的结果。