A 5kW supersonic chemical oxygen-iodine laser (COIL) has been constructed. A rotating mesh type singlet –delta oxygen generator (SOG) is used that appears to be simpler, lighter in weight and more efficient than the rotating disk SOG. An output power of 1kW from this supersonic COIL has been achieved by using the rotating mesh SOG at a Cl2 flow rate of 150mmol/s. Theoretical modeling of supersonic COIL based on a simplified premixed model is given.