Pixel MTF response effect on non-null interferometry

Martin Tangari Larrategui, Yanqi Zhang, Thomas G. Brown, Jonathan D. Ellis

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The pixel modulation transfer function response degrades the contrast of non-null interferometric surface figure measurements. We experimentally quantify this effect for spatial frequencies ranging from 0 to 363 lp/mm (≈3.33 times the Nyquist limit).Our results showa lowSNRspatial frequency band that behaves like a low-pass filter for sub-Nyquist interferometry and a stop-band filter for multiple-wavelength phase-shifting interferometry.We also introduce a multiplemode, multiple-wavelength interferometry approach to measure optical surfaces with slope departure angles mapping to spatial frequencies in this low SNR band. The extended measurement range of this approach is achieved without using a sparse-array detector.

Original languageEnglish (US)
Pages (from-to)4960-4963
Number of pages4
JournalOptics letters
Issue number19
StatePublished - Oct 1 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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