2021 Fiscal Year Annual Research Report
Crystalline mirrors with minimal thermo-optic noise for space-time metrology
| Project/Area Number |
19K03897
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
Flaminio Raffaele 国立天文台, 重力波プロジェクト, 特別客員研究員 (10723108)
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| Co-Investigator(Kenkyū-buntansha) |
LEONARDI MATTEO 国立天文台, 重力波プロジェクト, 助教 (90816448)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | gravitational wave / mirror / crystal / optical coating / thermal noise |
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| Outline of Annual Research Achievements |
This year we realized additional GaAs/AlGaAs multi-layer coatings by Molecular Beam Epitaxy on 4 inches GaAs wafers. We characterized them in terms of scattering, roughness and point defects. We then developed the procedure to transfer the coatings from the original GaAs wafers to 4 inches silica substrates. This was done first with a 4 layers coating and then with a thicker multi-layer coating made of 70 layers. After the transfer, optical characterization were done to measure the scattering, the roughness and the point defects of the final mirrors. In parallel we investigate the use of new oxides for the coatings of KAGRA.
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