Compact snapshot multiwavelength interferometer

Daodang Wang, Xiaobo Tian, Ping Xu, Jian Liang, Heng Wu, Oliver Spires, Rongguang Liang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We propose a snapshot and compact multiwavelength interferometer for real-time testing of optical surfaces with large slopes. A color camera with a micropolarizer array simultaneously captures the phase-shifted interferograms of multiple wavelengths, from which four interferograms with π∕2 phase shift at each wavelength are extracted for multiwavelength phase-shifting interferometric measurement. The accuracy of the proposed system is validated experimentally, and the testing of freeform surface with large slopes is also demonstrated. The proposed system provides a feasible way to obtain the instantaneous online measurement of freeform surfaces while minimizing environmental disturbance.

Original languageEnglish (US)
Pages (from-to)4463-4466
Number of pages4
JournalOptics letters
Issue number18
StatePublished - Sep 15 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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