腔内倾斜扰动对正支共焦腔本征模式的影响

针对激光器出光过程中腔内像差扰动带来的光束质量下降问题，分析了正支共焦腔腔内不同位置倾斜扰动对本征模式的影响，采用数值迭代法计算了理想状态及腔内不同位置倾斜扰动状态下的本征模式、相位Zernike像差拟合系数.结果表明：对大小给定的扰动，相位相对敏感性从凸面镜到凹面镜逐渐增加，且腔模倾斜像差增大的同时还将导致离焦、像散等高阶像差的增大，因此作腔内补偿时，应使补偿平面尽可能靠近凹面镜.

Influence in Eigenmode by Introducing Intracavity Tilt Perturbation

Intracavity perturbation will bring degrade of beam quality in high power laser.The result of influence in eigenmode by introducing intracavity tilt perturbation in different place of positive-branch confocal resonator was analyzed. At the same time,idea eigenmode,the mode of intracavity tilt perturbation in different place, Zernike aberration coefficient and the far field of beam were all analyzed by using numerical prony method. The results show that the sensibility is increased from convex mirror to concave mirror for a given aberration perturbation in different intracavity place. High order aberration such as defocus and astigmatism will also rise when tilt aberration increases in intracavity mode. So intracavity phase-corrected element used in unstable resonator should be near to concave mirror.