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中国物理学会期刊

地基激光干涉引力波探测器的升级与改造

CSTR: 32037.14.aps.74.20250852

Upgrades and improvements of ground-basedlaser interferometric gravitational wave detectors

CSTR: 32037.14.aps.74.20250852
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  • 地基激光干涉引力波探测器不仅首次发现引力波、开创了一个观测天文学的全新分支—引力波天文学, 同时也是物理学相关领域前沿科学与先进技术的成功典范. 为了实现引力波探测的目标, 使引力波成为一个常态化的天文观测手段, 全球主要地基引力波探测器经历了持续数十年的技术升级与改造. 本文重点介绍LIGO, Virgo和KAGRA等探测器的升级历程, 详细分析关键技术改进, 包括激光功率增强、悬挂与隔振系统优化以及量子噪声抑制等方面的进展. 这些技术进步显著提升了探测器在10至几千赫兹的灵敏度, 从而成功探测到数以百计的致密天体并合引力波信号. 展望未来, 第三代地基引力波探测器的建设将大幅度拓展引力波的探测能力, 为物理学和天文学研究开辟新的视野.

     

    Gravitational wave astronomy has rapidly developed into a powerful means of probing compact objects and understanding the evolution of the Universe. In order to improve sensitivity and expand the detection band, ground-based laser interferometers such as LIGO, Virgo, and KAGRA are constantly upgraded. This review summarizes their systematic development with an emphasis on noise sources and mitigation strategies. After outlining the principle of gravitational wave detection with laser interferometry, we analyze dominant noise sources, including quantum vacuum fluctuations, thermal noise, and seismic disturbances, and introduce techniques such as frequency-dependent squeezed light, advanced seismic isolation, multi-stage suspensions, and cryogenic mirrors. For LIGO, we highlight the transition from the Initial to Advanced configurations, which results in strain sensitivities of the order of 10^-24/\sqrt\textHz and leads directly to the first detection, GW150914, and over one hundred subsequent events during O1 to O4. The unique superattenuator system of Virgo and its recent implementation of squeezed light, as well as the underground design of KAGRA and the use of cryogenic sapphire test masses, represent different approaches to suppressing low-frequency and thermal noise. In addition, we compare the technical routes adopted by different detectors and summarize the lessons learned from their upgrades, thereby providing valuable guidance for designing future detectors. Finally, we present next-generation projects, including LIGO Voyager, the Cosmic Explorer, and the Einstein Telescope, which aim to increase sensitivity by up to orders of magnitude and provide new research opportunities for developing gravitational-wave cosmology and fundamental physics. Overall, the development of detector technologies has been a key driving force for advances in gravitational wave astronomy, and the forthcoming facilities will change our ability to explore the universe.

     

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