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Diagnostics of laser ablated plasma plumes

机译：激光烧蚀血浆羽流的诊断

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The effect of an ambient gas on the expansion dynamics of laser ablated plasmas has been studied for two systems by exploiting different diagnostic techniques. First, the dynamics of a MgB_2 laser produced plasma plume in an Ar atmosphere has been investigated by space-and time-resolved optical emission spectroscopy. Second, deposition rate and fast ion probe measurements have been used to study the plume propagation dynamics during laser ablation of a silver target, over a large range of Ar background gas pressures (from high vacuum to ≈ 100 Pa). A comparative analysis of the experimental results allows us to identify different regimes of the plume expansion, going from a free plume at low pressure, through collisional and shock-wave like hydrodynamic regimes at intermediate pressure, finally reaching a confined plume with subsequent thermalization of the plume particles at the largest pressure of the background gas. The experimental findings also show that a combination of complementary techniques, like optical emission spectroscopy, close to the target, and fast ion probe and deposition rate measurements at larger distances, can lead to a more detailed understanding of the laser ablated plasma plume propagation in a background gas.
机译：通过利用不同的诊断技术，已经针对两种系统研究了环境气体对激光烧蚀等离子体的膨胀动力学的影响。首先，通过空间和时间分辨光发射光谱法研究了在Ar气氛中MgB_2激光产生的等离子体羽流的动力学。其次，沉积速率和快速离子探针测量已用于研究在大范围的Ar背景气压（从高真空到≈100 Pa）上激光烧蚀银靶期间的羽流动力学。通过对实验结果的比较分析，我们可以确定不同的羽流膨胀方式，从低压的自由羽流，到中压下的碰撞和冲击波之类的流体力学状态，最终达到受限的羽流，随后将其热化。在背景气体的最大压力下产生羽状颗粒。实验结果还表明，将互补技术（例如靠近目标的光发射光谱法）和快速离子探针和较远距离处的沉积速率测量相结合，可以对激光烧蚀后的等离子体羽流在气体中的传播进行更详细的了解。背景气体。

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