为了使激光器单频运转，应用了许多方法来消除空间烧孔。
Various approaches have been taken to eliminate spatial hole burning, in order to achieve single frequency operation, the most widely used being the unidirectional ring laser.
能量密度达到造成液态质量迁移条件的长脉冲激光，可获得较大的烧蚀率和截面积较大的通孔。
A long-pulse laser, whose energy density can cause the liquid mass transferred, can get a greater ablation ratio and a hole with larger cross section.
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