Apparatus for measuring surface properties of polishing pad
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United States of America Patent
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Sep 3, 2019
Grant Date -
Sep 18, 2014
app pub date -
Sep 11, 2013
filing date -
Mar 12, 2013
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Abstract
The present invention relates to an apparatus for measuring surface properties of a polishing pad which measures surface properties such as surface topography or surface condition of a polishing pad used for polishing a substrate such as a semiconductor wafer. The apparatus for measuring surface properties of a polishing pad includes a laser beam source configured to emit a laser beam, and a photodetector configured to detect scattered light that is reflected and scattered by the polishing pad, an optical Fourier transform being performed on the detected scattered light to produce an intensity distribution corresponding to a spatial wavelength spectrum based on surface topography of the polishing pad. The laser beam is applied to the polishing pad at such an incident angle that the laser beam does not reach a bottom portion of a pore formed in the surface of the polishing pad.
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