Experimental results of an innovative dynamic low-coherent interferometer for characterizing a gravitational wave detector

Jesús Vilaboa Pérez; Marc Georges; Juriy Hastanin; Jérôme Loicq

doi:10.1117/12.2677489

4 October 2023 Experimental results of an innovative dynamic low-coherent interferometer for characterizing a gravitational wave detector

Jesús Vilaboa Pérez, Marc Georges, Juriy Hastanin, Jérôme Loicq

Author Affiliations +

Proceedings Volume 12672, Applied Optical Metrology V; 126720F (2023) https://doi.org/10.1117/12.2677489
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

We present the experimental results of the proof of concept of a metrology instrument developed to characterize the cryogenic mirror of the Einstein Telescope (ET) prototype. ET is a proposed gravitational-wave observatory. The metrology instrument uses the principle of low-coherence interferometry to measure the local change in topology and local induced vibrations of the mirror resulting from the cooling down process. We implement an innovative optical phase mask and a microlens array to obtain a depth map of the mirror on a single camera frame. With our instrument prototype, we can obtain 25 interference patterns of the same mirror spot for each camera frame. Each interference pattern corresponds to a difference Optical Path Difference (OPD). Then by reconstructing the interference patterns, we can measure the mirror’s local topology change and local induced vibration. Moreover, in this proceeding, we describe the analysis of the white-light interference patterns through numerical simulations and depict the metrology instrument’s optical design. Finally, we discuss how we can use the metrology instrument for real-time characterization of other optical components with all the advantages of white light interferometry.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jesús Vilaboa Pérez, Marc Georges, Juriy Hastanin, and Jérôme Loicq "Experimental results of an innovative dynamic low-coherent interferometer for characterizing a gravitational wave detector", Proc. SPIE 12672, Applied Optical Metrology V, 126720F (4 October 2023); https://doi.org/10.1117/12.2677489

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