Spectroscopic studies on the sidelight emisson spectrum of a sealed-off CO2 laser
The lifetime and output power of the sealed-off CO2 laser are influenced by the change in the gas composition of the laser during discharge. We are able to set up an experimental system that allows us to observe this phenomenon. Through spectral monitoring of the sidelight or spontaneous emission spectrum of the laser discharge, the presence of important gas species, such as CO and O are observed. The time base scans of the 5601 Å CO line emission show that the signal decreases with time suggesting that CO further dissociates into C and O. The presence of carbon deposits along the inner tube walls in the cathode region supports this phenomenon. The decreasing intensity of the 8446 Å O line emission suggests thar O interacts with other residual gas species.