LD快轴发散角和晶体吸收效率的关系
LD的快轴发散角为35度，发光面与晶体棒轴线的距离为6毫米，这保证了几乎所有的抽运光直接被晶体吸收，从而提高了吸收效率。
The fast axis divergence angle of LD is 35°, and the distance between its emitting surface and crystal rod axis is 6 mm, ensuring that almost all pump light is directly absorbed by the crystal, thus improving the absorption efficiency.
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