What are fiducial dots and how are they used?

AOM typically includes a set of fiducial dots on its patterns. These dots serve a variety of purposes:

  • They are used to locate a specific position on the CGH null and associate that with a specific position on the test optic.
  • Additionally, fiducials can be used to line up two maps, such as a CGH substrate transmitted error map and a test optic measurement map, before subtracting one from another.
  • Properly placed fiducials can also resolve ambiguity in map orientation.

Fiducial dots in CGH pattern


Fiducial dots marked in measurement

Fiducial dots are utilized in Morpheus™, a software solution that can automatically subtract CGH substrate error, perform mapping correction, and more!

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