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Development of frequency dependent squeezing technique for sensitivity improvement of gravitational wave detector KAGRA

开发频率相关挤压技术以提高引力波探测器 KAGRA 的灵敏度

基本信息

批准号：
18F18024
负责人：
Flaminio Raffaele
金额：
$ 1.41万
依托单位：
National Astronomical Observatory of Japan
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2018
资助国家：
日本
起止时间：
2018-10-12 至 2021-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18F18024/
关键词：
gravitational waves squeezing cavity locking wavefront sensor Gravitational waves Squeezing

项目摘要

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.

本财年，我们在《物理评论快报》上发表了一篇论文，首次展示了用于先进引力波探测器宽带量子降噪的频率相关压缩真空源。这一结果在APS和OSA杂志上得到了重点报道。目前世界上主要的引力波探测器都采用了这种技术。在达到这一里程碑之后，我们提高了实验装置的可靠性。特别是，我们实现了一个波前传感系统，以自动对准滤光腔的绿色光束。此外，我们还准备了一个新的OPO和一个新的法拉第隔离器的实现，以减少实验的光损耗。最后，我们开发了一种新的滤波器腔锁定控制系统。这种新系统是基于使用用于相干控制的边带来将滤波器腔锁定在其工作点。首先，我们在《物理学》杂志上发表了一篇论文，描述了这种方法。然后我们实现了该方法，并成功地使用它锁定了滤波器腔。这种方法允许使用相干控制边带锁定腔体，即一束完全叠加到压缩真空光束上。这是前所未有的。