This hole array was created in stainless steel using an infrared laser.  The material was 12 μm thick, and each hole had a diameter of 25 μm.  The tolerance for hole diameter was +/- 2 μm.

 

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Hole array in stainless steel using an infrared laser
These micro-holes have a diameter of 25 μm that was drilled into 12 μm thick stainless steel using an infrared laser.