按照论文要求润色下面这段话并翻译为中文：由于陶瓷反射器的直径越短晶体的吸收效率越高15因此在保证晶体冷却效果的前提下我们将反射器的内径缩短至最小的8mm同时玻璃管的内径设计为6mm。这样LD发光面到晶体轴中心的距离仅为6mm能够在晶体棒中获得较高的抽运光功率密度有利于实现高功率激光输出。

Due to the fact that the smaller the diameter of the ceramic reflector, the higher the absorption efficiency of the crystal [15], we have reduced the inner diameter of the reflector to a minimum of 8mm while ensuring the cooling effect of the crystal. Meanwhile, the inner diameter of the glass tube is designed to be 6mm. As a result, the distance between the LD emission surface and the crystal axis is only 6mm, which enables a higher pumping light power density in the crystal rod and facilitates high-power laser output.

由于陶瓷反射器的直径越小，晶体的吸收效率越高[15]，因此我们在保证晶体冷却效果的前提下，将反射器的内径缩短至最小的8mm，同时将玻璃管的内径设计为6mm。这样，LD发光面到晶体轴中心的距离仅为6mm，能够在晶体棒中获得较高的抽运光功率密度，有利于实现高功率激光输出