Optimization and maximum output power of CW DCN laser

A high power CW 195 mum DCN laser has been developed for fusion plasma diagnostics. Optimization of various parameters (such as the rate of N-2:CD4:He gas mixture, the gas pressure and the discharge current, the wall temperature and the output couple) for maximum output power at the DCN laser were performed and reported in this paper. Output power of about 220 mW on the 195 mum line has been obtained with 3.4 m long and 54 mm inner diameter discharge-pumped wave-guide laser. A new mixture gas of N-2:CD4:D-2 was used in producing a stable high-power discharge and preventing the deposition of brown polymer with lower wall temperature and discharge current.