Various mechanisms have been proposed to explain the nonphotochemical laser-induced nucleation (NPLIN). Identifying the dominant mechanism requires addressing a large set of experimental parameters with a statistically significant number of samples, forced by the stochastic nature of nucleation. In this study, with aqueous KCl system, we focus on the nucleation probability as a function of laser wavelength, laser intensity, and sample supersaturation, whereas the influence of filtration and the laser-induced radiation pressure on NPLIN activity is also studied. To account for the nucleation stochasticity, we used 80–100 samples. The NPLIN probability showed an increase with increasing laser intensity. The results are different from the previous report, as a supersaturation independent intensity threshold is not observed. No dependence of the NPLIN probability on the laser wavelength (355, 532, and 1064 nm) was observed. Filtration of samples reduced the nucleation probability suggesting a pronounced role of impurities on NPLIN. The magnitude and the propagation velocity of the laser-induced radiation pressure were quantified using a pressure sensor under laser intensities ranging from 0.5 to 80 MW/cm². No correlation was found between the radiation pressure and NPLIN at our unfocused laser beam intensities ruling out the radiation pressure as a possible cause for nucleation.

中文翻译：

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激光诱导过饱和KCl水溶液成核的多参数研究

已经提出了多种机制来解释非光化学激光诱导的成核（NPLIN）。要确定主要机制，就需要根据成核的随机性来处理大量具有统计意义的样本的实验参数。在这项研究中，在含水氯化钾系统中，我们着重研究成核概率与激光波长，激光强度和样品过饱和度的关系，同时还研究了过滤和激光诱导的辐射压力对NPLIN活性的影响。为了说明成核的随机性，我们使用了80–100个样本。NPLIN概率显示出随着激光强度的增加而增加。结果与以前的报告不同，因为未观察到过饱和强度阈值。没有观察到NPLIN概率对激光波长（355、532和1064 nm）的依赖性。样品的过滤降低了成核的可能性，表明杂质在NPLIN上具有明显的作用。使用压力传感器在0.5至80 MW / cm的激光强度下量化激光诱导辐射压力的大小和传播速度²。在我们未聚焦的激光束强度下，辐射压力与NPLIN之间没有相关性，从而排除了辐射压力是成核的可能原因。