大功率脉冲TEA CO_2激光器配气比对输出的影响

Influence of gas mixture ratios on laser outputs of high power pulsed TEA CO_2 laser

针对大功率脉冲TEA CO2激光器的放电腔在不同工作气压和不同配气比例条件下对激光器输出能量和电光转换效率均有较大影响,研究了充气压力从30kPa到60kPa,配气比例由CO2:N2=1:1到CO2:N2=1:4变化条件下,放电腔工作气压和配气比例对激光器输出能量和转换效率的影响。实验结果显示:当CO2:N2的配气比例为1:3时,激光器输出的电光转换效率存在最佳点。在最佳配气比例CO2:N2:He=3:9:28,总气压为40kPa和注入激励电能保持不变的情况下,激光器单脉冲放电时的输出能量为24.6J,电光转换效率达16.4%。在高频连续放电实验中,激光器的最高放电频率可达500Hz并且连续稳定运行。实验数据表明,选择合适的放电腔工作气压和配气比例可以改变激光器的输出能量,提高激光器的电光转换效率。

With the aim to improve the output powers and electro-optical conversion efficiencies of a high power pulsed TEA CO2 laser, the influence of different gas pressures and different gas mixture ratios in high power pulsed TEA CO2 laser on the output powers and electro-optical conversion efficiencies is researched in gas pressures from 30 kPa to 60 kPa and gas mixture ratios from CO2 ： N2 = 1 ： 1 to CO2 ： N2 = 1 ： 4. The experimental results show that the best value for laser output electro-optical conversion efficiency can be obtained when the gas mixture ratio of CO2 to Nz is 3. The output energy for the single pulse discharges can achieve 24. 6 J and the electro-optical conversion efficiency is 16. 4% when the gas ratio of CO2： N2： He equals 3：9：28 and a total gas pressure is 40 kPa under the condition of same injection exciting electric energy. In a experiment of high repetition rate and continuous discharge, the laser can operate aontinuously and steadily at maximum frequency of 500 Hz. These data reported here prove that choosing properly the work gas pressures and gas mixture ratios can optimize the output powers and electro-optical conversion efficiencies of high power pulsed TEA CO2 lasers.