Investigation of the evolution of trace impurities from a newly constructed copper vapour laser

Abstract

We have identified numerous molecular and atomic impurities evolving from the alumina ceramics used in the construction of copper vapour laser (CVL) plasma tubes during the high temperatures associated with typical operating conditions. The majority of these molecular impurities fragments under discharge conditions, with most of the by-products of dissociation contributing to the formation of solid deposits within the plasma tube while hydrogen-bearing molecules produce free or H which can improve CVL output power. Implications for plasma tube design and processing are discussed.

In situHPHT resistance measurement of (Fe0.125,Mg0.875)2SiO4in a designed laser heated diamond anvil cell

“…Because of the high thermal conductivity of diamond, one important aspect of using a laser for sample heating in a DAC is sample insulation from the diamond anvils. In addition, as well as being used as electrical insulation material as described above, Al 2 O 3 has also been used as a thermal insulation material [19]. The crystal structure of Al 2 O 3 is stable to 175 GPa [20], which eliminates the error and complexity introduced in high-pressure resistivity measurement.…”