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Proceedings Paper

Visibility optimization of phase-shifting diffraction-grating interferometer
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Paper Abstract

The phase-shifting diffraction-grating interferometer uses a diffraction grating that performs manifold functions of beam splitting, beam recombining, and phase shifting. The reference and measurement waves generated by means of diffraction have different amplitudes depending on their orders of diffraction, so the interference fringe pattern resulting from the two waves tends to yield poor visibility. In this investigation, we select a phase grating of reflection type and attempt to improve the interference visibility with optimization of the groove shape of the grating through numerical analysis. And we apply the proposed analytic method to the CGH null system for testing a large-scale aspheric mirror, which adopt a binary amplitude CGH and a new phase-shifting diffraction-grating interferometer.

Paper Details

Date Published: 2 August 2004
PDF: 12 pages
Proc. SPIE 5531, Interferometry XII: Techniques and Analysis, (2 August 2004); doi: 10.1117/12.559349
Show Author Affiliations
Tae-Joon Hwang, Korea Advanced Institute of Science and Technology (South Korea)
Seung-Woo Kim, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 5531:
Interferometry XII: Techniques and Analysis
Katherine Creath; Joanna Schmit, Editor(s)

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