Effect of Solid-State Laser Power and Gas Pressure on the Specific Fundamental Parameters of Argon DC Glow Discharge Plasma

Abstract

This study investigates the effects of solid-state laser power and argon gas pressure on selected fundamental parameters of a DC glow discharge. The discharge was generated by applying a DC voltage of up to 6 kV, while a 532 nm solid-state laser with power ranging from 0 to 5 watts was directed through the plasma. The electron thermal de Broglie wavelength, plasma skin depth, laser phase velocity, and plasma dielectric permittivity were calculated using the electron temperature and electron density obtained in a previous experimental study. The results show that the electron thermal de Broglie wavelength increases with both laser power and gas pressure because of the corresponding reduction in electron temperature. The plasma skin depth increases approximately with gas pressure but decreases nonlinearly as the laser power increases, reflecting the associated changes in electron density and plasma conductivity. The calculated laser phase velocity decreases with increasing gas pressure and increases with laser power. In addition, the dielectric permittivity increases with gas pressure but gradually decreases as the power rises. These findings demonstrate that laser power and gas pressure can significantly influence electromagnetic-wave propagation and the fundamental properties of argon glow-discharge plasma under the investigated conditions.