第二个问题就是激光光源会产生“光斑”，也就是说激光会在一个不均匀的表面发生散射，产生随机明暗斑点。

The second problem, though, is that laser light can “speckle”, which is to say that when it scatters off a rough surface, a random shimmering and sparkling pattern is produced.

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第二个问题就是激光光源会产生“光斑”，也就是说激光会在一个不均匀的表面发生散射，产生随机明暗斑点。

The second problem, though, is that laser light can "speckle", which is to say that when it scatters off a rough surface, a random shimmering and sparkling pattern is produced.

youdao

由于粉末棒密度不均匀，生长过程中又有气泡产生，CO2光源的功率必须严格控制，并随时调整以适应单晶光纤的生长。

The power of CO2 laser is critical due to the non-uniform density and the air bubble in it. It must be strictly controlled.

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