engleski

Coupling of laser produced plasma and atmospheric pressure plasma jet

In the laser-induced breakdown in gases, electrons accelerate in the laser field and ionise the gas by colliding with the gas species. What mostly determines if the breakdown will occur is the ionisation energy of the gas target, and the irradiance of the laser beam. However, if there is some concentration of excited atoms in the gas, the breakdown will occur more easily, and the generated electrons liberated from the atoms will have higher kinetic energies. In this work, we have used atmospheric pressure plasma jet as a target for laser-induced breakdown. Pulsed DC source was used for the plasma generation, with variable pulse width and was synchronised in time with the Nd:YAG laser pulse. This type of electrical discharge is a pulsed phenomenon and accordingly, concentration of different species in the plasma change in time. Depending on the delay between the electrical discharge initiation and the laser pulse arrival, we have measured the temporal evolution of the light emission from the laser-produced plasma, using a monochromator and a fast photomultiplier tube. Acknowledgements: This study was supported by Croatian Science Foundation (Project 2753)

Laser induced plasma, optical emission spectroscopy, atmospheric pressure plasma jet

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