束旋转90°对束变换环孔腔输出性能的影响

 使用积分方法和差分方法结合的快速计算方法，在实际燃烧驱动氟化氢化学激光器增益介质沿径向分布不均匀的情况下，考虑在光束变换环形孔径激光谐振腔的紧束段引入光束旋转90°对其输出性能的影响。计算结果显示：在无腔失调的情况下，在紧束段引入光束旋转对束变换环孔激光谐振腔输出功率及光束质量的改善并不显著；在存在腔失调的情况下，紧束段光束旋转对于输出功率和光束质量的改善有显著效果。

Effects on mode characteristics of beam-conveting annular resonator with beam rotation 90°in the compact leg

In this paper,a combination of integral and differential methods were applied to calculate the mode characteristics of beam convereting annular resonator with various chemical annular gain medium.Two designs were compared:one is designed without beam rotaion in the compact leg,and the other with beam rotating 90°. It shows that beam rotation in the compact leg has little effect on the mode characteristics,when the resonator is aligned perfectly.However,when the resonator is misaligned,beam rotation in the compact leg can not only sustain zero level mode, but also get better beam quality and output power than the resonator without beam rotation. In practice resonators can not be aligned perfectly,so beam rotation is necessary to beam converting annular resonator.