A simple model of photoionization of excited atoms by UV photons from capacitor spark discharges is suggested to explain theimprovement in both plasma density production and laser efficiency noticed by several investigators when the proportion of helium inhigh-pressure COj laser mixtures is increased. Such improvementswith increased He proportion take place both with and without seedingwith low ionization potential dopants. The model is also applicableto explaining the arc suppression qualities of helium as well as theability to ignite discharges at higher total pressures when the proportion of helium is increased. Several implications regarding future TEAlaser work are suggested.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering