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

Conference paper (2022)

Authors

Jesús Vilaboa Pérez Université de Liège
Jérôme Loicq Spaceborne Instrumentation - Aerospace Engineering
Research Group
Spaceborne Instrumentation (Aerospace Engineering) (TU Delft)
Copyright: © 2022 Jesús Vilaboa Pérez, J.J.D. Loicq
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Published Date

2022

Language

English

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Faculty

Aerospace Engineering

Department

Space Engineering

Research Group

Spaceborne Instrumentation

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.

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