Simulation of pulse TEA CO2 laser output

In order to study effect of gas ratio, pumping electron density and cavity length on output power of pulse transversely excited atmospheric(TEA)CO2 laser, six temperature models were employed to analyze the energy transfer among different molecular vibration modes of working gas and the output power of laser by theoretical analysis and numerical simulation. The simulation was in good agreement with the experimental data. The results show that when the volume ratio of CO2, N2, and He rises from 4:30:65 to 6:30:65, the pulse power increases and the delay time gets shorter. When the volume ratio of CO2, N2, and He rises from 5:15:65 to 5:35:65, the pulse power firstly increases and then decreases, and reaches the maximum at the volume ratio of N2 about 25. When the volume ratio of CO2, N2, and He is 5:30:65, the maximum pumping electron density rises from 41012/cm3 to 61012/cm3, and the cavity length rises from 2m to 4m, the pulse power will gradually increase. The pulse power is greater, the delay time is shorter, and the tailing phenomenon is more longer. The simulation results show that gas ratio, pumping electron density and cavity length have effects on pulse output power. The study provides a reference for design and optimization of CO2 lasers.