The effect of the matrix temperature on laser-induced plasma generated in bulk water by using a 532 nm pulsed laser beam has been studied. Ca I and II emission line intensities were recorded for an aqueous solution of CaCl 2 in the temperature range of 7 °C–70 °C. The emission line intensities did not follow the matrix temperature in our experiments. Maximum intensities were observed at ∼18 °C for both lines. Herein, a possible mechanism responsible for the observed variation in intensity is suggested, in which laser-produced bubbles play important roles. Bubble formation is essential to ignite plasma in the liquid and more feasible at the higher liquid temperature. However, the abundant bubbles at the higher temperature can scatter the incident laser beam more effectively to decrease the energy delivered for the laser-induced plasma. Thus, these two roles have effects on the optical emission intensities in opposite ways. The validity of the suggested mechanism is disc...

中文翻译：

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532 nm脉冲激光在散装水中产生的激光诱导等离子体：线强度随水温和潜在的潜在物理变化而变化

研究了基质温度对使用532 nm脉冲激光束在散装水中产生的激光诱导等离子体的影响。记录在7°C–70°C温度范围内的CaCl 2水溶液的Ca I和II发射谱线强度。在我们的实验中，发射线强度不遵循基体温度。两条线均在约18°C时观察到最大强度。在此，提出了一种可能的机制，该机制负责观察到的强度变化，其中激光产生的气泡起着重要的作用。气泡的形成对于点燃液体中的等离子体至关重要，并且在较高的液体温度下更可行。但是，较高温度下的大量气泡可以更有效地散射入射激光束，从而减少为激光诱导的等离子体传递的能量。从而，这两个作用以相反的方式影响光发射强度。建议机制的有效性是光盘...