| KAGRA引力波探测器中频率相关压缩态实验进展 |
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| 引用本文： | 郭越凡,CAPOCASA Eleonora,EISENMANN Marc,FLAMINIO Raffaele,LEONARDI Matteo,TACCA Matteo,肇宇航,李木子,吕振伟.KAGRA引力波探测器中频率相关压缩态实验进展[J].天文学进展,2019(1):73-85. |
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| 作者姓名： | 郭越凡 CAPOCASA Eleonora EISENMANN Marc FLAMINIO Raffaele LEONARDI Matteo TACCA Matteo 肇宇航 李木子 吕振伟 |
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| 作者单位： | 北京师范大学天文系;日本国立天文台重力波推进实验室;天体粒子与宇宙学实验室;阿纳西粒子物理实验室;国家亚原子物理研究所 |
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| 摘 要： | 随着技术的发展,下一代引力波探测器的激光功率将得到进一步提高。大光斑半径的应用也将使探测器的热噪声进一步降低,因此,量子噪声将成为在全频段限制引力波探测器灵敏度的首要因素。作为目前最有保障的一种降低量子噪声的技术,频率相关压缩态很可能将被应用于下一代所有引力波探测器中1]。频率相关压缩态可以通过将频率不相关压缩态与滤波腔相结合而产生。基于滤波腔具有的频率响应特性,这一技术的应用可以使低频波段的辐射压噪声有效降低,同时实现高频波段散粒噪声的降低,从而实现全探测频段灵敏度的提升。基于日本KAGRA引力波探测器的设计,我们预计将9dB压缩度的压缩态与周损失为8×10-5的300m滤波腔相结合,可以使探测器灵敏度在全探测频段提高1倍。此实验于2015年开始,目前滤波腔的安装调试已经基本完成,得到的结果基本与实验前的模拟相符合。与频率不相关压缩态光学实验台的安装过程也已经过半,通过温度和控制回路的调制,二次谐波腔的转化率已经超过50%。
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| 关 键 词： | 引力波 引力波探测器 量子噪声 压缩态 |
Progress of Frequency Dependent Squeezing for Upgrade KAGRA Detector |
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| Institution: | (Astronomy Department,Beijing Normal University,Beijing 100875,China;Gravitational Wave Project Office,National Observatory of Japan,Tokyo 181-8588,Japan;AstroParticule et Cosmologie,Paris 75205,France;Nikhef,Amsterdam 1098 XG,The Netherlands;LAPP,Annecy 74941,France) |
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| Abstract: | KAGRA is the Japanese kilometer-scale ground-based interferometric gravitational wave detector.It is currently in the commissioning stage and it will soon join LIGO and Virgo for the detection of gravitational waves.Adding KAGRA to the detectors network will increase the sky location accuracy of the gravitational wave source.The several special techniques used in KAGRA will generate new experience.The underground location of the detector will reduce the seismic noise and cryogenic operation will reduce the thermal noise.As a future upgrade of the ground-based gravitational wave interferometric detectors,the laser power and the mirror mass will increase.In this condition,the quantum noise will limit the sensitivity in all the detection frequency range.To reduce quantum noise in the next generation gravitational wave detectors,one of the most well-known quantum non-demolition techniques is the so-called frequency dependent squeezing.The application of this technique consists on the injection of a 9 dB squeezed vacuum,filtered by a 300 m long cavity with 80 ppm of round trip loss.Rotating the squeezing angle by using the filter cavity has been demonstrated in the MHz range with a 0.5 m long cavity13]and in the kHz range with a 2 m long cavity14].In this article we briefly introduce the theory of this technique and,based on the design of KAGRA,we calculate a factor of 2 improvements on the design sensitivity.We present the latest progresses on the experiment currently ongoing in the laboratory of NAOJ,where we are aiming to demonstrate the theoretical prediction of quantum noise suppression.The south arm of the old TAMA300 detector is used as the filter cavity,which is the first 100 m scale filter cavity and the longest in the world. |
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| Keywords: | gravitational wave gravitational wave detector quantum noise squeezed state |
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