In order to study the laser plasma plume radiation mechanisms induced by the interaction between Nd: YAG plused laser and silicon, the radiation model of silicon laser plasma plume is established. Laser plasma plume radiation includes atom characteristic lines, ion lines and continuous background. It can reflect the characteristics of laser plasma plume radiation, reveal the mechanism of laser ablation on silicon. Time-resolved measurment of laser plasma plume radiation produced by pulsed Nd: YAG laser ablation of silicon in different ambient gas is thoroughly studied. The experimental ambient gas are N2 and O2.The pulse width of Nd: YAG plused laser adopted in the experiment is 20ns, the pulse energy is 60mJ, the laser pulsing frequency is 10Hz, and the emitted laser wavelength is 1064nm, The silicon target purity is 99.99%, The target is rotating at a speed of 240r/min. The focusing area of the laser on the Si target has a diameter of around 0.8mm.The pressure of ambient gas is tunable between 13Pa and 101.3kPa in the induced chamber, the number of points used in averaging is 15. The experimental results show that the ambient gas has obvious enhancement effect on the radiation intensity of silicon laser plasma plume. With the increase of the ambient gas pressure, the silicon laser plasma plume radiation intensity will first be increased and then be decreased, and the ambient gas has an obvious compression effect on the scope of silicon laser plasma plume radiation. For the two different ambient gases, the maximum silicon laser plasma plume radiation intensity and maximum pressure for they are different, for oxygen at 35kPa, for nitrogen at 50kPa. The silicon laser plasma plume radiation intensity in oxygen is bigger than that in nitrogen.The main excition mechanisms of laser plasma plume radiation induced by Nd:YAG plused laser induced silicon is analyzed, The plused laser can makes part molecules in the ambient gas and silicon atoms ionized at the surface of silicon.The main reason for the generation of the silicon laser plasma plume radiation is the excitation radiation by the collision energy transfer between electrons and atoms or ions. The experimental phenomenon that could be explained by the excition model.
In order to study the radiation properties of plasma plume induced by the
interactions between laser and material, the radiation model of plasma plume is
established. The properties of plasma plume induced by ultraviolet plused laser
induced stannum in neon are thoroughly studied. The pulse width of XeCl ultraviolet
laser adopted in the experiment is 10ns, the pulse energy is 90mJ, and the emitted
laser wavelength is 308nm. The pressure of neon ambient gas is tunable between
13Pa and 101.3kPa in the induced chamber. Some color photographs of laser-induced
plasma plume are obtained through swift and synchronous photograph. The
experimental results show that the plasma plume induced by ultraviolet plused laser
induced stannum has different color properties at different areas. Under the low
pressure of 13Pa, the central area of plasma plume is white; the medial area is mixed
color while the outermost area is blue. Each area of the plasma plume decreases
gradually as the gas pressure increases, and the color becomes lighter as the
atmospheric pressure increases. The main excition mechanisms of light-emission of
plasma plume induced by ultraviolet plused laser induced stannumat at different areas are analyzed, and it is believed that there are different light-emission model at
different areas. The excition mechanism of the central area of plasma plume is
bremsstrahlung, as for medial area and outlying region, it is the combination excition
of electrons and ions. The experimental phenomenon that could be explained by the
excition model.
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