Abstract: Pointing stability, beam divergence and beam generating mode have been studied in a copper vapor laser equipped with a modified off-axis unstable resonator. In the modified cavity design, the convex mirror is coupled via the edge of a flat scraper mirror, in contrast to the common resonator design where the edge of a convex mirror is used for feedback. As a result, the pointing stability improved, and day to day fluctuations were as small as 200$mu@rad. The beam divergence was about nine times the diffraction limit for the green laser line. The relatively high beam divergence, as well as spatial and temporal analysis of the beam generating mode, shows that a beam traversing the active medium only three times constitutes the useful laser radiation. Possible mechanisms causing the dominance of the triple-pass beam are discussed. An explanation for the impact of the beam generating process on the pointing stability and its improvement in the new cavity design is suggested.!
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机译：摘要：在装有改进的离轴不稳定谐振器的铜蒸气激光器中研究了指向稳定性，光束发散和光束产生方式。在改进的腔体设计中，与普通的谐振器设计不同，在普通的谐振器设计中，凸面镜的边缘用于反馈，而凸面镜是通过平面刮镜的边缘耦合的。结果，指向稳定性得到改善，并且每天的波动小至200 $ mu @ rad。光束发散度约为绿色激光线衍射极限的九倍。较高的光束发散度以及光束产生模式的时空分析表明，光束仅穿过活性介质3次即可构成有用的激光辐射。讨论了导致三通光束占优势的可能机制。建议解释光束产生过程对指向稳定性的影响及其在新型腔体设计中的改进。
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