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Laser drilling aspect ratio and tapering?

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antknee

antknee

Mechanical
Joined
Oct 6, 2010
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104
Location
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I'm trying to understand the aspect ratio when laser drilling. I will be using an ND Yag for drilling an entry diameter of 20 microns and I know the hole will get smaller as it drills through about 0.2mm thickness.

How can I calculate what the exit diameter will be?

Thanks,

Ant.
 
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