The effect of hydrogen addition to some HCN laser active mixtures on the C.W. output power at 337 μm
An experimental investigation has been carried out in order to find out the effect of hydrogen gas addition to the basic HCN laser fuel on the continuous output power of the laser at 337 μm. The experiment has been performed by adding hydrogen to the striated discharge at a constant flow rate, pressure and external glass tube temperature, and for stabilized currents ranging from 0.2 to 0.9 A. With the exception of the ethylene-nitrogen mixture, the output power of the laser decreased for hydrogen enriched mixtures regardless of the magnitude of the hydrogen percentage added to the basic constituents. However, the alteration of the chemical composition of the gaseous mixture led to the variable mode supression at 337 μm for the fundamental transverse and the next higher mode.