Coupling of surface roughness to the performance of computer-generated holograms

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Computer-generated holograms (CGHs), such as those used in optical testing, are created by etching patterns into an optical substrate. Imperfections in the etching can cause small scale surface roughness that varies across the pattern. The variation in this roughness affects the phase and amplitude of the wavefronts in the various diffraction orders. A simplified model is developed and validated that treats the scattering loss from the roughness as an amplitude effect. We demonstrate the use of this model for engineering analysis and provide a graphical method for understanding the application. Furthermore, we investigate the magnitude of this effect for the application of optical testing and show that the effect on measurement accuracy is limited to 1 nm for typical CGHs.

Original languageEnglish (US)
Pages (from-to)6572-6576
Number of pages5
JournalApplied optics
Volume46
Issue number26
DOIs
StatePublished - Sep 10 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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