When the fill factor is less than 1, the concentrated tensile stress appeares near edge of disk surface, while the fill factor reaches up to 1, the surface exhibites compressive stress, and the center is less tensile stress.

• 当抽运光斑未充满激光介质时，介质的表面靠近边缘处会出现大的拉应力集中，并且介质表面的最大轴向位移和最大拉应力随光斑填充因子增大而增大；而当抽运光充满介质时，表面是压应力，较小的拉应力存在于介质内部。