Experimental study of the interaction between DC discharge microplasmas and CW lasers

Optics Express
Ebrahim ForatiDan Sievenpiper

Abstract

A high power (~ 1W) continuous wave (CW) laser was focused on argon microplasma generated in the microgap between two electrodes with submillimeter diameters. Dependence of breakdown (V<sub>BD</sub>) and quench (V<sub>Q</sub>) voltages of microplasma to the laser power, wavelength, and spot location were studied as the gap size and pressure varied. It was observed that the laser-plasma interaction can only occur thermally through the electrodes. Also, the thermal effect of the laser was noticeable at relatively higher pressures (> 10Torr), and in most cases led to a decrease in V<sub>BD</sub>, proportional to the pressure.

References

Apr 1, 1985·Physical Review A: General Physics·G M Weyl, D Rosen

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