INTERFEROMETER SYSTEM AND METHOD TO GENERATE AN INTERFERENCE SIGNAL OF A SURFACE OF A SAMPLE
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United States of America Patent
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May 30, 2014
filing date -
Jun 10, 2013
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Abstract
An interferometer system to generate an interference signal of a surface of a sample includes a broadband illuminator to provide a broadband illumination beam, a beam splitter to split the broadband illumination beam in a reference beam for reflection on a reference reflector and a measurement beam for reflection on the surface of the sample, and a detector to receive an interference radiation intensity created between the reference beam reflected from the reference reflector and the reflected measurement beam from the surface of the sample to generate an interference signal. The interferometer system having a continuous variable broadband reflector in the beam splitter and/or the reference reflector to adjust the broadband radiation intensity balance between the measurement beam and the reference beam.
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