2020 Fiscal Year Annual Research Report
Development of frequency dependent squeezing technique for sensitivity improvement of gravitational wave detector KAGRA
| Project/Area Number |
18F18024
|
|---|
| Research Institution | National Astronomical Observatory of Japan |
|---|
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)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
CAPOCASA ELEONORA 国立天文台, 重力波プロジェクト, 外国人特別研究員
|
|---|
| Project Period (FY) |
2018-10-12 – 2021-03-31
|
| Keywords | gravitational waves / squeezing / cavity locking / wavefront sensor |
|---|
| Outline of Annual Research Achievements |
This fiscal year we published a paper on Physical Review Letters on the first demonstration of frequency-dependent squeezed vacuum source for broadband quantum noise reduction in advanced gravitational-wave detectors. This result was highlighted in the magazines of APS and of OSA. All the main gravitational wave detectors in the world have now adopted this technology.
After this milestone was achieved, we improved the reliability of the experimental apparatus. In particular, we implemented a wave front sensing system in order to automatically align the filter cavity to the green beam. In addition, we prepared the implementation of a new OPO and a new Faraday isolator in order to reduce the optical losses of the experiment.
Finally, we developed a new control system for the locking of the filter cavity. This new system is based on the use of the sidebands used for the coherent control to lock the filter cavity at its operating point. First, we published a paper on Phys Rev D describing the method. Then we implemented the method and successfully we locked the filter cavity using it. This method allow locking the cavity using the coherent control sidebands i.e. a beam perfectly superposed to the squeezed vacuum beam. This was never done before.
|
| Research Progress Status |
令和2年度が最終年度であるため、記入しない。
|
| Strategy for Future Research Activity |
令和2年度が最終年度であるため、記入しない。
|
-
-
-
-
-
[Journal Article] Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA2020
Author(s)
Yuta Michimura, Kentaro Komori, Yutaro Enomoto, Koji Nagano, Atsushi Nishizawa, Eiichi Hirose, Matteo Leonardi, Eleonora Capocasa, Naoki Aritomi, Yuhang Zhao, Raffaele Flaminio et al.
-
Journal Title
Physical Review D
Volume: 102
Pages: 022008
DOI
Peer Reviewed / Int'l Joint Research
-
-
-
-
-
