Dr. Chunyu Zhao, President of Arizona Optical Metrology, to present at SPIE Optics + Photonics conference on Monday August 2, 2021

Jul 30, 2021

AOM President Dr. Chunyu Zhao will be presenting a talk on the history of CGH technology at this year’s SPIE Optics + Photonics conference, as part of a special session: Tribute to James C. Wyant: The Extraordinaire in Optical Metrology and Optics Education.  

The presentation, “Computer-generated holograms for testing aspheres and freeforms: a review”  will take place Monday, 2 August from 5:05 PM – 5:20 PM PDT.  We hope to see you there!


The computer generated hologram, or CGH, is the current de facto standard for accurate surface figure measurements of aspheres and freeforms. In this paper we will go over the history of the CGH technology development: from the birth of holography to the invention of computer generated hologram; from early application of the CGH in testing aspheric surfaces to the development of precision fabrication techniques; from use of the CGH as null lens to more innovative applications testing and aligning optical systems. Dr. Wyant is a pioneer in the early development of the technology. His specific contributions will be introduced in detail. Efforts underway to expand the CGH use are also described.