Dynamic short- and large-coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype

Jesús Vilaboa Pérez; Jérôme Loicq

doi:10.1117/12.2622903

20 May 2022 Dynamic short- and large-coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype

Jesús Vilaboa Pérez, Jérôme Loicq

Author Affiliations +

Proceedings Volume 12137, Optics and Photonics for Advanced Dimensional Metrology II; 121370T (2022) https://doi.org/10.1117/12.2622903
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Conference Poster

Abstract

The E-TEST project builds a prototype for the Einstein Telescope (ET). ET is a proposed gravitational-wave observatory. E-TEST includes a silicon mirror of 30 cm up to 40 cm diameter, suspended and cooled down at cryogenic temperatures from 20 K to 30 K. During the cooling down, the mirror will be affected by surface topology changes, wavefront deformation, and induced vibrations. We present a metrology device based on short-coherence interferometry to characterize the mirror surface with a sub-nanometer resolution. We design an innovative phase mask to achieve dynamic or single-frame white light interferometry. Moreover, we discuss different interferogram analysis methods. We also discuss the implementation of a long-coherence source to facilitate the measurements with the low-coherence source.

Conference Presentation

Citation Download Citation

Jesús Vilaboa Pérez and Jérôme Loicq "Dynamic short- and large-coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype", Proc. SPIE 12137, Optics and Photonics for Advanced Dimensional Metrology II, 121370T (20 May 2022); https://doi.org/10.1117/12.2622903

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