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Substrate-transferred GaAs/AlGaAs crystalline coatings for gravitational-wave detectors: A review of the state of the art by Cole, G. D.; Ballmer, S.; Billingsley, G.; Cataño-Lopez, S. B.; Fejer, M.; Fritschel, P.; Gretarsson, A. M.; Harry, G. M.; Kedar, D.; Legero, T.; Makarem, C.; Penn, S. D.; Reitze, D.; Steinlechner, J.; Sterr, U.; Tanioka, S.; Truong, G. -W.; Ye, J.; Yu, J. is a scholarly article available to read on EtoBox.

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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 in a workshop{\dag} 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 larg

Author
Cole, G. D.; Ballmer, S.; Billingsley, G.; Cataño-Lopez, S. B.; Fejer, M.; Fritschel, P.; Gretarsson, A. M.; Harry, G. M.; Kedar, D.; Legero, T.; Makarem, C.; Penn, S. D.; Reitze, D.; Steinlechner, J.; Sterr, U.; Tanioka, S.; Truong, G. -W.; Ye, J.; Yu, J.
Published
2023
Language
EN

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