Substrate-transferred GaAs/AlGaAs crystalline coatings for gravitational-wave detectors
Substrate-transferred GaAs/AlGaAs crystalline coatings for gravitational-wave detectors
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DOI：
10.1063/5.0140663
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发表时间：
2023-03-13
影响因子：
4
通讯作者：
Yu, J.
中科院分区：
文献类型：
--
作者：
Cole, G. D.;Ballmer, S. W.;Yu, J.
从这一角度出发，综述了用于干涉型引力波探测器的大面积、低噪声衬底传输的GaAs/AlGaAs(AlGaAs)晶体涂层的技术发展现状。这些主题最初是作为2022年8月15日至8月17日在华盛顿特区美国大学举行的AlGaAs研讨会的一部分提出的，来自激光干涉仪引力波天文台(LIGO)、Virgo和KAGRA合作的GW社区成员、精密光学计量界的科学家以及在上述涂层制造方面拥有丰富专业知识的行业合作伙伴齐聚一堂。基于AlGaAs的晶体涂层使GW观测站的射程比目前使用离子束溅射反射镜的系统大得多。考虑到AlGaAs在室温下的低热噪声，GW探测器可以实现这些显著的灵敏度提高，同时潜在地避免低温操作。然而，大面积AlGaAs涂层的发展面临着独特的挑战。在此，我们描述了与晶体涂层相关的最新研究和开发工作，包括对新型噪声工艺的表征工作以及大面积(类似于直径10厘米)反射镜的光学计量。我们进一步探索了将最大涂层直径扩大到20厘米及以上的选择，开辟了一条生产符合未来GW探测器升级的低噪声反射镜的途径，同时注意到这些基于半导体的涂层的独特要求和预期的实验试验台。(C)2023作者(S)。除另有说明外，所有文章内容均根据知识共享署名(CC BY)许可证(http：//creativeommons.org/licks/by/4.0/)进行许可。Https://doi.org/10.1063/5.0140663
In this Perspective, we summarize the status of technological development for large-area and low-noise substrate-transferred GaAs/AlGaAs (AlGaAs) crystalline coatings for interferometric gravitational-wave (GW) detectors. These topics were originally presented as part of an AlGaAs Workshop held at American University, Washington, DC, from 15 August to 17 August 2022, bringing together members of the GW community from the laser interferometer gravitational-wave observatory (LIGO), Virgo, and KAGRA collaborations, along with scientists from the precision optical metrology community, and industry partners with extensive expertise in the manufacturing of said coatings. AlGaAs-based crystalline coatings present the possibility of GW observatories having significantly greater range than current systems employing ion-beam sputtered mirrors. Given the low thermal noise of AlGaAs at room temperature, GW detectors could realize these significant sensitivity gains while potentially avoiding cryogenic operation. However, the development of large-area AlGaAs coatings presents unique challenges. Herein, we describe recent research and development efforts relevant to crystalline coatings, covering characterization efforts on novel noise processes as well as optical metrology on large-area (similar to 10 cm diameter) mirrors. We further explore options to expand the maximum coating diameter to 20 cm and beyond, forging a path to produce low-noise mirrors amenable to future GW detector upgrades, while noting the unique requirements and prospective experimental testbeds for these semiconductor-based coatings.(c) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http:// creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/5.0140663