Systematic study of hydrogenation in a diamond amplifier

Abstract

We recently developed a reliable hydrogenation procedure for the diamond amplifier that assures the generation of a high-current, high-brightness beam. In this paper, we compare room-temperature hydrogenation with that at high temperatures. We identified the factors leading to the decay of quantum efficiency. The optimum temperature for heat treatment ranged from $400--450\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$; its superiority was proven in the gain test. Hydrogenated diamond amplifiers exposed to ${\mathrm{N}}_{2}$ and air exhibited a good emission after being heated to $350\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$; the highest gain we registered in emission scanning was 178. Our systematic study of hydrogenation resulted in the reproducible fabrication of diamond amplifiers.