FAQs

Quick answers to your pressing metrology questions!

cgh, computer generated hologram in an optical setup, a laser interferometer measuring an aspheric or freeform surface

What is a CGH (Computer-Generated Hologram)?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

How are CGHs used?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What is a “null”?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What is a “UUT”?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

How is a CGH mounted and adjusted?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What types of surfaces can be measured using a CGH?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What is the typical accuracy of a CGH?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What are the benefits of using a CGH for metrology?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What is CGH substrate error and how does it get subtracted?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals

What are fiducial dots and how are they used?

Date: October 3, 2023
By: Shelby Ament
Categories: Fundamentals