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Piezo-deformable mirrors for active mode matching in advanced LIGO

Srivastava, Varun and Mansell, Georgia and Makarem, Camille and Noh, Minkyun and Abbott, Richard and Ballmer, Stefan and Billingsley, Garilynn and Brooks, Aidan and Cao, Huy Tuong and Fritschel, Peter and Griffith, Don and Jia, Wenxuan and Kasprzack, Marie and MacInnis, Myron and Ng, Sebastian and Sanchez, Luis and Torrie, Calum and Veitch, Peter and Matichard, Fabrice (2022) Piezo-deformable mirrors for active mode matching in advanced LIGO. Optics Express, 30 (7). pp. 10491-10501. ISSN 1094-4087. doi:10.1364/oe.445088.

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The detectors of the laser interferometer gravitational-wave observatory (LIGO) are broadly limited by the quantum noise and rely on the injection of squeezed states of light to achieve their full sensitivity. Squeezing improvement is limited by mode mismatch between the elements of the squeezer and the interferometer. In the current LIGO detectors, there is no way to actively mitigate this mode mismatch. This paper presents a new deformable mirror for wavefront control that meets the active mode matching requirements of advanced LIGO. The active element is a piezo-electric transducer, which actuates on the radius of curvature of a 5 mm thick mirror via an axisymmetric flexure. The operating range of the deformable mirror is 120±8 mD in vacuum and an additional 200 mD adjustment range accessible out of vacuum. Combining the operating range and the adjustable static offset, it is possible to deform a flat mirror from −65 mD to −385 mD. The measured bandwidth of the actuator and driver electronics is 6.8 Hz. The scattering into higher-order modes is measured to be <0.2% over the nominal beam radius. These piezo-deformable mirrors meet the stringent noise and vacuum requirements of advanced LIGO and will be used for the next observing run (O4) to control the mode-matching between the squeezer and the interferometer.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Srivastava, Varun0000-0002-4296-5463
Mansell, Georgia0000-0003-4736-6678
Noh, Minkyun0000-0001-5876-8854
Abbott, Richard0000-0003-1106-1178
Ballmer, Stefan0000-0003-2306-523X
Billingsley, Garilynn0000-0002-4141-2744
Brooks, Aidan0000-0003-4295-792X
Cao, Huy Tuong0000-0001-6583-6907
Fritschel, Peter0000-0003-1983-3187
Jia, Wenxuan0000-0002-5119-6328
Kasprzack, Marie0000-0003-4618-5939
MacInnis, Myron0000-0001-8733-9207
Ng, Sebastian0000-0001-5843-1434
Veitch, Peter0000-0002-2597-435X
Matichard, Fabrice0000-0001-8982-8418
Additional Information:© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Received 5 Oct 2021; revised 25 Jan 2022; accepted 7 Feb 2022; published 15 Mar 2022. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under cooperative agreement PHY-1764464. A+ was built under award PHY-1234382. This paper carries LIGO Document Number LIGO P2100315. Parts of this research were conducted by the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), through project number CE170100004. Funding: Australian Research Council (CE170100004); National Science Foundation (PHY-1234382, PHY-1764464). Data Availability. Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request. The authors declare no conflict of interest.
Funding AgencyGrant Number
Australian Research CouncilCE170100004
Other Numbering System:
Other Numbering System NameOther Numbering System ID
LIGO DocumentP2100315
Issue or Number:7
Record Number:CaltechAUTHORS:20220520-231747000
Persistent URL:
Official Citation:Varun Srivastava, Georgia Mansell, Camille Makarem, Minkyun Noh, Richard Abbott, Stefan Ballmer, GariLynn Billingsley, Aidan Brooks, Huy Tuong Cao, Peter Fritschel, Don Griffith, Wenxuan Jia, Marie Kasprzack, Myron MacInnis, Sebastian Ng, Luis Sanchez, Calum Torrie, Peter Veitch, and Fabrice Matichard, "Piezo-deformable mirrors for active mode matching in advanced LIGO," Opt. Express 30, 10491-10501 (2022)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114858
Deposited By: George Porter
Deposited On:24 May 2022 17:38
Last Modified:24 May 2022 17:38

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