激光诱导Al等离子体电子温度的时间空间演化特性研究

An Investigation on the time and spatial evolution of the electron temperature in laser-induced Al plasmas

实验测定了激光烧蚀Al等离子体中Al原子在380～500nm波长范围内的时间和空间分辨发射光谱.由Al原子390.068nm、394.4nm、396.152nm、466.3056nm、451.25nm、352.95nm发射光谱线的强度计算了等离子体电子温度,并由实验结果讨论了激光等离子体中电子温度的时间和空间演化特性.实验结果表明,当延时在100～1500ns范围内变化时,相应的电子温度T_e范围为6200K～32700K;当距离靶表面0～1.8mm范围内变化时,相应的电子温度T_e范围为9800K～32700K,电子温度在沿激光束方向上的分布具有很好的对称性.

The time and spatial resolved emission spectrum of Al atom in laser induced Al plasma were measured in the wavelength region from 380 nm to 500 nm. The electron temperature of plasmas was calculated from the measured intensity of 390. 068 nm,394.4 nm,396. 152 nm,466. 3056 nm,451.25 nm, 352.95 nm emission spectral lines of Al atom. The temporal and spatial evolution properties of the electron temperature were finally discussed according to the experimental results. It is shown from the measured results that the electron temperature is varied from 6200 K to 32700 K when the time delay in the range from 100 ns to 1500 ns. It is also concluded that the electron temperature is varied from 9800 K to 32700 K along the direction on the laser beam when the distance of the measured zone from the target surface is in the range from 0 mm to 1.8 mm. The distribution of plasma electron temperature along the direction of the laser beam has well symmetry.