Visibility optimization of phase-shifting diffraction-grating interferometer

Tae-Joon Hwang; Seung-Woo Kim

doi:10.1117/12.559349

2 August 2004 Visibility optimization of phase-shifting diffraction-grating interferometer

Tae-Joon Hwang, Seung-Woo Kim

Proceedings Volume 5531, Interferometry XII: Techniques and Analysis; (2004) https://doi.org/10.1117/12.559349
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

Citation Download Citation

Tae-Joon Hwang and Seung-Woo Kim "Visibility optimization of phase-shifting diffraction-grating interferometer", Proc. SPIE 5531, Interferometry XII: Techniques and Analysis, (2 August 2004); https://doi.org/10.1117/12.559349

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KEYWORDS

Diffraction gratings

Diffraction

Wavefronts

Interferometers

Phase shifts

Computer generated holography

Mirrors

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