Problem ellipsomter SNF 2007-09-25 18:56:49: Laser beam problem

khanh at khanh at
Tue Sep 25 18:56:50 PDT 2007

I noticed that the beam on the chuck on and off and seem like the beam is blocked sometimes.
Measured LTO oxide on si (expected 200) and gave me 4 different values at the same spot on the wafer 150, 201, 750 and  1000.

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