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Off-axis negative-branch unstable resonator with rectangular cross-section

机译：矩形截面的离轴负分支不稳定谐振器

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For laser media with large cross-section and low small signal gain neither the stable nor the unstable conventional resonator is an applicable choice. Either the large Fresnel number leads to a multimode operation or the low output coupling ring results in large diffraction effects and therefore in a heavily structured far field. In order to reduce these diffraction effects a modified negative-branch unstable resonator (MNBUR) was introduced. In rotational symmetry the off-axis setup provides an output coupling in the shape of a half ring and is accomplished with the help of a scraper. The shape of this scraper can also be modified to adapt the MNBUR to a rectangular symmetry, whereas the spherical resonator mirrors are kept unchanged. The scraper either takes the shape of a rectangular bracket "[" or of the letter "L". The performance of both scrapers is tested using a chemical oxygen iodine laser (COIL) of the 10 kW class. The results are compared to numerical calculations.
机译：对于具有大横截面和低小信号增益的激光介质，稳定和不稳定的常规谐振器都不适用。较大的菲涅耳数会导致多模工作，或者较低的输出耦合环会导致较大的衍射效应，从而导致结构化的远场。为了减小这些衍射效应，引入了改进的负分支不稳定谐振器（MNBUR）。在旋转对称中，离轴设置提供了一个半环形状的输出耦合，并借助刮刀完成。还可以修改此刮刀的形状，以使MNBUR适应矩形对称，而球形谐振器镜保持不变。刮板的形状可以是矩形括号“ [”或字母“ L”。使用10 kW级的化学氧碘激光器（COIL）测试两个刮板的性能。将结果与数值计算进行比较。

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