线性判别分析作为研究1064 nm CW laser光与冷电感耦合等离子体相互作用的替代方法
Linear discriminant analysis as an alternative method to investigate the interaction of a 1064 nm CW laser light with a cold inductively-coupled plasma
摘要：
本文从实验和理论两方面研究了1064 nm连续激光与荧光灯泡中感应耦合等离子体的相互作用。对于不同的功率测量，获得了与等离子体介质有关的吸收系数。结果表明，吸收系数随激光功率的增大而减小。利用电荷耦合光谱仪记录了不同激光功率下汞等离子体的紫外-可见光谱。等离子体光谱的线性判别分析（LDA）揭示了等离子体的离子和电子振荡。电子振荡的傅里叶级数模型得到了惠斯勒模式的频率wpe= 0.16 kHz，密度ne=3.9x1013 cm^（-3）。LDA系数的三维表示表明，激光功率的增加导致等离子体物种形成的哨声模式结构。从SPARTAN非局部热平衡（非LTE）光谱代码推断等离子体电子温度（e T），在没有激光的情况下，它们约为0.6 eV。然而，有一个0.05 eV的电子温度增加时，激光功率被吸收的等离子体。电子温度随着功率水平的增加而略微增加，这反过来导致较小的吸收系数，因为吸收系数与Te^（-3/2）成比例。
英文摘要：
In this paper, the interaction of a 1064 nm continuum-wave laser with inductively-coupled plasma generated in a fluorescent light bulb has been studied both experimentally and theoretically. The absorption coefficients pertaining to the plasma medium were obtained for different power measurements. The results indicate that absorption coefficients decrease with the increase in laser power. The UV-Vis spectra of mercury plasma were recorded by the charge-coupled spectrometer device at different power levels of laser. The linear discriminant analysis (LDA) of plasma spectra reveals the plasma ion and electron oscillations. Fourier series modeling of electron oscillation results the Whistler mode frequency of wpe= 0.16 kHz with a density of ne=3.9x1013 cm^(-3). 3D representation of LDA coefficients shows that the increase of laser power leads the plasma species to form in Whistler mode structures. Plasma electron temperatures ( e T ) was inferred from the SPARTAN non-local thermal equilibrium (non-LTE) spectral code, and they were about 0.6 eV in the absence of laser light. However, there was a 0.05 eV increase in electron temperature when the laser power was absorbed by the plasma. Electron temperatures slightly increased with the increase in the power levels, which in turn resulted in smaller absorption coefficients since the absorption coefficients scales with Te^(-3/2).
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