求翻译：从激光器发出的激光束具有一定的发散角，对于激光加工来说，只有通过扩束镜的调节使激光光束变为准直光束，才能利用聚焦镜获得细小的高功率密度光斑是什么意思？

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The laser beams from Laser issued a divergence angle, for laser processing, it is only through such a mirror close to adjust the laser beam into a quasi-direct beam focus lens can be used to obtain small high power density optical grouper

The laser beam sends out which from the laser has certain divergence angle, regarding the laser processing, only then causes the laser light beam through the scattering beam mirror adjustment to become the collimation light beam, can obtain the tiny high power density facula using the focusing mirro

Sent from the laser has a certain divergence angle of laser beam, laser processing, only through beam expander with regulation of laser beam into a collimated beam, you can use focusing mirror access to small high power density beam

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