Scaling dependence of a low temperature operated copper vapor laser

An experimental study focused on the radial scaling of HyBrID (Hydrogen Bro mide In Discharge) copper vapor lasers has been carried out by using laser tubes (length 1.2 m) of inner diameter 40, 60 and 80 mm. The detailed param etric dependence on laser output power with each of the bore tubes is compa red under the same operating conditions. 90 W of output power was obtained with both a 40 and 60 mm bore tube. By increasing the tube temperature, sim ilar high output power can be produced with a 80 mm bore tube. Enlarging th e tube bore results in a reduction of extractable average output power. It has been found that the output characteristics strongly depend on the tube temperature. Control of the tube temperature is crucially important for eff iciently producing high output power. A discussion is presented in which th e lasing performance under the differing tube conditions is compared.