大功率脉冲TEA CO2激光器配气比对输出的影响

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,因此,通过充气压力从30kPa到60kPa的改变和配气比例CO₂:N₂＝1:1到CO2:N2＝1:4的变化,可以改变激光器的输出能量,提高激光器电光转换效率。实验结果表明：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;激光器高重复频率放电运转时的电光转换效率达16.4％。激光器的最高放电频率可以达到500Hz并且连续稳定运行工作。

Influence of gas mixture ratio to laser output in high power pulsed TEA CO2 laser

There is great influence on the output electro-optical convention efficiency for the different gas pressure and different gas mixture ratio in high power pulsed TEA CO2 laser. Therefore the output energy of laser changes with various gas pressures or various gas ratios in the laser resonator, which the convention efficiency of laser also increases accordingly. The experimental results show that the best value exists for laser output electro-optical convention efficiency when the gas ratio of CO2:N2:He equals 3:9:28. Under the condition of same injection exciting electric energy and total gas pressure 40kPa, the output energy can achieve 24.6J when single pulse discharges; the laser electro-optical convention efficiency can achieve 16.4% when laser works at high repetition rate and continuous discharge. Laser can operate continuously and steadily at maximum 500Hz.