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首页> 外文会议>Progress in High-Temperature Superconducting Transistors and Other Devices II >Laser-target interactions and its effect in controlling properties of laser-deposited superconducting thin films
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Laser-target interactions and its effect in controlling properties of laser-deposited superconducting thin films

机译：激光-靶相互作用及其在控制激光沉积超导薄膜性能中的作用

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Abstract: The nature of evaporation/ablation characteristics during pulsed laser deposition strongly controls the quality of laser-deposited films. To understand the origin of particulates in laser deposited films, we have simulated the thermal history of YBa$- 2$/Cu$-3$/O$-7$/ targets under intense nanosecond laser irradiation by numerically solving the heat flow equation with appropriate boundary conditions. During planar surface evaporation of the target material, the sub-surface temperatures were calculated to be higher than the surface temperatures. While the evaporating surface of the target is constantly being cooled due to the latent heat of vaporization, sub-surface superheating occurs due to the finite absorption depth of the laser beam. Sub- surface superheating was found to increase with decreasing absorption coefficient and thermal conductivity of the target, and with increasing energy density. The superheating may lead to sub-surface nucleation and growth of the gaseous phase which can expand rapidly leading to microexplosions and 'volume expulsion' of material from the target. Experiments conducted by us and other research groups suggest a strong relation between degree of sub-surface superheating and particle density in laser-deposited films.!23
机译：摘要：脉冲激光沉积过程中蒸发/烧蚀特性的性质强烈地控制着激光沉积膜的质量。为了了解激光沉积膜中颗粒的起源，我们通过数值求解热流方程，模拟了强纳秒激光辐照下YBa $ -2 $ / Cu $ -3 $ / O $ -7 $ /靶的热历史。适当的边界条件。在目标材料的平面蒸发期间，计算出的子表面温度高于表面温度。当靶的蒸发表面由于汽化潜热而不断被冷却时，由于激光束的有限吸收深度而发生了表面下过热。发现亚表面过热随着靶的吸收系数和导热率的降低以及能量密度的提高而增加。过热可能会导致气相的地下成核和生长，气相会迅速膨胀，从而导致微爆炸和从目标“逐出”材料。我们和其他研究小组进行的实验表明，表面过热程度与激光沉积膜中的颗粒密度之间存在密切关系。23

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