Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 36, Issue 12, Pages 3464-3470Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.36.003464
Keywords
-
Categories
Funding
- Air Force Office of Scientific Research [FA90550-18-1-0204]
- Israel Science Foundation [893/15]
- Office of Naval Research Global [N62909-18-1-2165]
Ask authors/readers for more resources
Recently it was observed that adding a small amount of methane to the He buffer gas of a static potassium diode pumped alkali laser (K DPAL) increases considerably the laser power. Further increase in the amount of methane leads to a moderate decrease in power. In the present work the effect of methane addition was investigated theoretically applying a 3D computational fluid dynamics (CFD) and potassium kinetics model, which was supplemented by the analysis of the electron temperature and K ion ambipolar diffusion. It was found that for a pure He buffer the K DPAL power is lower than for He/CH4 mixtures due to slow ion-electron recombination and high electron temperature exceeding 3000 K. The high electron temperature in pure He results in fast ambipolar diffusion of K ions to the wall and depletion of the neutral K atoms in the lasing region. These effects are mitigated when methane is added to the buffer gas. The calculated results for the normalized laser power are in satisfactory agreement with the experimental ones. (C) 2019 Optical Society of America
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available