高功率TEA CO2激光器两波长激光切换输出技术

 以TEA CO₂激光器通常采用的平-凹光学稳定腔为基础，提出了一种新的波长选支方法——输出窗口镀膜选支方法。利用一台高平均功率TEA CO₂激光器进行了选支实验研究，结合现有光学镀膜技术，得到了中心波长为9.3 μm的激光单谱线输出，其单脉冲能量及平均功率与激光器原中心波长10.6 μm单谱线输出的相应参数基本相当。研究发现，以相同单脉冲能量激光照射热敏纸时，中心波长9.3 μm激光光斑与中心波长10.6 μm的明显不同。同时，还设计出两波长窗口密闭免调切换装置，在一台激光器上实现了10.6，9.3 μm两个中心波长激光同等功率水平的免调切换输出，切换位置误差小于5″，密封性能满足使用要求。

Two-wavelength laser switching output technology in high power TEA CO2 laser

Based on the plano-concave resonator, a new way to choose a branch of wavelength is reported. A laser with 9.3 μm single-line output is attained by using a high average power TEA CO₂ laser and the existing optical coating technology. The single pulse energy and average power are basically the same as those of the original single 10.6 μm output. It is found that the laser spots attained by shooting the heat-sensitive paper with the same laser pulse energy at 9.3 μm and 10.6 μm are significantly different. A two-wavelength windows switching device is designed, which can realize free switching between 10.6 μm and 9.3 μm lasers at the same output power level on one laser. The switch position error is less than 5″, and the sealing performance meets the requirements.