Paper published in a journal (Scientific congresses and symposiums)
Dynamic short- and large-coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype
Vilaboa Perez, Jesus; Loicq, Jerôme
2022 • In Proceedings of SPIE: The International Society for Optical Engineering, 12137 (121370T)
White Light Interferometry; Dynamical Phase Shifting Interferometry; Single-Frame low-coherence Interferometry; Phase Mask; Measurement of vibrations with interferometry
Abstract :
[en] 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.
Research center :
CSL - Centre Spatial de Liège - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Vilaboa Perez, Jesus ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Loicq, Jerôme ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Language :
English
Title :
Dynamic short- and large-coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype
Publication date :
20 May 2022
Event name :
SPIE Photonics Europe 2022
Event date :
from 9 to 15 May 2022
Journal title :
Proceedings of SPIE: The International Society for Optical Engineering
ISSN :
0277-786X
eISSN :
1996-756X
Publisher :
International Society for Optical Engineering, Bellingham, United States - Washington
Special issue title :
Optics and Photonics for Advanced Dimensional Metrology II
Volume :
12137
Issue :
121370T
Name of the research project :
E-TEST Interreg V-A Euregio Meuse-Rhine Programme
Funders :
ERDF - European Regional Development Fund [BE]
Funding text :
The E-TEST project is carried out within the framework of the Interreg V-A Euregio Meuse-Rhine Programme,
with 7,5 million euros from the European Regional Development Fund (ERDF). By investing EU funds in Interreg
projects, the European Union is investing directly in economic development, innovation, territorial development,
social inclusion and education in the Euregio Meuse-Rhine.
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