采用带有标准具的Fox-Smith谐振腔产生了稳定可调谐的单纵模TEA CO₂激光输出。对干涉腔反射率的数值模型进行了研究,讨论了失谐角、子腔的匹配等因素对模式选择的影响,并且进行了实验验证。实现了10.6 μm单纵模激光输出,能量140 mJ,重复率达到90％,腔内元件没有受到损伤。

We obtain a stable tunable single-longitudinal-mode (SLM) TEA CO₂ laser oscillation by using a Fox-Smith cavity with a Fabry-Prot etalon inserted in the sub-cavity. A numerical model of the reflectivity of the interference cavity is studied. The influence of the detuned angle and the sub-cavity-matching on the mode-choosing is discussed,and the verification experiment is carried out. Finally we get 140 mJ of SLM output energy at 10.6 μm with repetition frequency of single longitudinal mode as high as 90%,and there is no damage on the elements in the cavity.