2015 Fiscal Year Annual Research Report
Development of crystalline mirrors for high precision measurements of space and time
| Project/Area Number |
26610073
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
フラミニオ ラファエレ 国立天文台, 重力波プロジェクト推進室, 特任教授 (10723108)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | Coatings / Crystals / Absorption / Scattering |
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| Outline of Annual Research Achievements |
During the second year of the project we first realizes two new test samples made of multi-layer GaAs/AlAs crystalline coatings deposited on GaAs wafer. On both samples we measured the scattering, the absorption and the point defects. We found more point defects and more scattering than on the previous samples. The absorption was also higher but probably it was affected by some absorption in the substrate since the coating reflectivity was not as high as in the previous samples. Finally we realized one multi-layer GaAs/AlAs crystalline coatings deposited on a GaAs wafer and then transferred on a sapphire wafer. On this sample we measured the scattering and the point defects. Both showed quite good performances. The scattering in particular is comparable to the best scattering measured on the highest quality dielectric coatings.
Some of this work was done in collaboration with CNRS/LMA in Lyon (France) and CNRS/LPN in the Paris area (France). Some preliminary results were presented at the JPS meeting in September 2015.
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[Journal Article] Mechanical loss in state-of-the-art amorphous optical coatings2016
Author(s)
Granata, M; Saracco, E; Morgado, N; Cajgfinger, A; Cagnoli, G; Degallaix, J; Dolique, V; Forest, D; Franc, J; Michel, C; Pinard, L; Flaminio, R
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Journal Title
Physical Review D
Volume: 93
Pages: 012007-(1-16)
DOI
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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