Cryogenic optical testing of sic mirrors for ASTRO-F and C/SiC composite mirrors for SPICA

Kaneda, Hidehiro; Enya, Keigo; Onaka, Takashi

doi:10.1117/12.2308002

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…The SPICA also has undergone extensive system testing and planning for their future launch. Part of the planned system tests involve cryogenic testing at temperatures below 10 K [213,214]. The total wavefront error of the telescope will be measured using an interferometer in autocollimation, similar to the cryogenic tests implemented on the JWST.…”

Section: Telescope Testingmentioning

confidence: 99%

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

et al. 2018

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This review paper addresses topics of fabrication, testing, alignment, and as-built performance of reflective space optics for the next generation of telescopes across the x-ray to far-infrared spectrum. The technology presented in the manuscript represents the most promising methods to enable a next level of astronomical observation capabilities for space-based telescopes as motivated by the science community. While the technology to produce the proposed telescopes does not exist in its final form, the optics industry is making steady and impressive progress toward these goals across all disciplines. We hope that through sharing these developments in context of the science objectives, further connections and improvements are enabled to push the envelope of the technology.

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Section: Telescope Testingmentioning

confidence: 99%

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

et al. 2018

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“…Kaneda et al used a mechanical phase-shifting laser interferometer to test the cryogenic performance of carbon-fiber-reinforced silicon carbide (C/SiC) mirror. 17 Another example is the surface deformation test of the James Webb Space Telescope mirrors. The test was conducted in a high-vibration environment at cryogenic temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Kaneda et al. showed the topology change of a large mirror working at cryogenic temperatures 17 . Hence, our instrument’s mirror characterization is essential for the accuracy of results in detecting GWs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic coherence scanning interferometry based on an optical phase mask for simultaneous measurement of local induced vibration and local topology change of a mirror

Pérez,

Georges,

Hastanin

et al. 2024

Opt. Eng.

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We describe the state of the development of a coherence scanning interferometer to measure local changes in topology and local induced vibrations of a mirror at cryogenic temperatures. The metrology instrument incorporates an optical phase mask and a microlenses array, enabling the acquisition of complete white light interferograms within a single-camera frame. This stands in contrast to traditional temporal phase-shifting interferometers. We design the optical phase mask as a combination of steps of different thicknesses, so each step introduces a different optical path difference to the rays. The local interferograms for each camera frame provide us with information on the local topology of the mirror. The interferogram displacement between camera frames allows us to monitor the mirror's local induced vibrations. In this work, we report the metrology instrument's working principle through numerical simulations and present the latest results of a proof of concept developed at the laboratory. The metrology instrument shown is of extensive usability in diverse applications related to real-time measurements of various fast physical processes and realtime characterization of the optical components topology.

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“…H. Kaneda et al proved the topology change of a large mirror at cryogenic temperatures. 2 In the framework of the Einstein Telescope, the mirror characterization is essential to ensure the accuracy of the results in the detection of gravitational waves.…”

Section: Introductionmentioning

confidence: 99%

Low coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype

Pérez

Georges

Lenaerts

et al. 2022

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V

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We describe the state of development of a white light interferometer to characterize the cryogenic mirrors for GW detector on operation. We include the first experimental results from the proof of concept of the metrology instrument. The instrument will characterize the topology as well as the vibration of the mirrors. This development takes place in the frame of the E-TEST project. E-TEST is one of the technology demonstrators for the future Einstein Telescope (ET). ET is dedicated to the measure and characterization of gravitational waves. The prototype built by E-TEST includes a large silicon mirror of 40 cm diameter suspended by innovative vibration isolation hanging modules. To reach the detection specification, the mirror is cooled down at cryogenic temperatures around 20 K. Nevertheless, even after the isolation, the mirror may not reach perfect stability once at cryogenic temperatures. Furthermore, the mirror may experience surface topology changes and wavefront deformation due to the extreme variations in temperature and gradient. With our metrology instrument, we can obtain on a single camera frame a set of interferogram maps of the area observed on the mirror at different optical path differences. To do this, we design an innovative phase mask for a white light low-coherence interferometer. In addition, we implement new algorithms for the white light interferogram analysis, avoiding the limitations of the conventional Phase Shifting Interferometry algorithms.

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Cryogenic optical testing of sic mirrors for ASTRO-F and C/SiC composite mirrors for SPICA

Cited by 6 publications

References 3 publications

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

Dynamic coherence scanning interferometry based on an optical phase mask for simultaneous measurement of local induced vibration and local topology change of a mirror

Low coherence interferometry to characterize the induced vibrations and topology change of the cryogenic mirror of the Einstein Telescope prototype

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