Segmented wavefront metrology using multicolor PISTIL interferometry

Bastien Rouzé; Cindy Bellanger; Patrick Lanzoni; Frédéric Zamkotsian; Jérôme Primot

doi:10.1117/12.2553084

1 April 2020 Segmented wavefront metrology using multicolor PISTIL interferometry

Bastien Rouzé, Cindy Bellanger, Patrick Lanzoni, Frédéric Zamkotsian, Jérôme Primot

Proceedings Volume 11352, Optics and Photonics for Advanced Dimensional Metrology; 113520V (2020) https://doi.org/10.1117/12.2553084
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

PISTIL (Piston and Tilt) is a recent interferometric system that computes the absolute piston and tip/tilt map of a segmented wavefront. Its high precision makes it usable as a metrology tool for wavefront sensing of coherently-combined laser arrays for example. This interferometer needs to correctly address high dynamic piston sensing, while dealing with fringes wrapping that leads to ambiguous phase estimations. We derived a mathematical combination for two measurements at different wavelengths and did a technical demonstration of it, using a IRIS-AO PTT111 Deformable Mirror as a segmented wavefront generator. We have verified that the loss of accuracy is slightly increased for a larger piston compared to a previous study, and we got a standard error of λ/160 with a Peak-to-valley of λ/50. This technique could be extended to a broader spectrum.

Conference Presentation

Citation Download Citation

Bastien Rouzé, Cindy Bellanger, Patrick Lanzoni, Frédéric Zamkotsian, and Jérôme Primot "Segmented wavefront metrology using multicolor PISTIL interferometry", Proc. SPIE 11352, Optics and Photonics for Advanced Dimensional Metrology, 113520V (1 April 2020); https://doi.org/10.1117/12.2553084

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