The supersonic nozzles lower temperature to 170-180 K better for the small signal gain coefficient. But at this temperature, the CO₂ buffer gas may become liquid state. A chemical oxygen-iodine laser (COIL) employing CO₂ as buffer gas and no-flake-nozzle was studied. Some mathematical simulation in three-dimensional computation fluid dynamics was adopted first to validate its usability. New nozzles gave the temperature higher than 400 K and considerable small signal gain coefficient. In the same conditions as simulation, experiments gave a 23% of chemical efficiency and 2.5 kW of output power. And it have got rid of “black area”, which was familiar in the supersonic COIL both in simulation and experimental results.

Date Published: 3 February 2015
PDF: 10 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 925526 (3 February 2015); doi: 10.1117/12.2065089

Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)