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Article ; Online: Modeling circulating cavity fields using the discrete linear canonical transform.

Ciobanu, A A / Brown, D D / Veitch, P J / Ottaway, D J

Journal of the Optical Society of America. A, Optics, image science, and vision

2021 Volume 38, Issue 9, Page(s) 1293–1303

Abstract: Fabry-Perot cavities are central to many optical measurement systems. In high-precision experiments, such as aLIGO and AdVirgo, coupled cavities are often required, leading to complex optical behavior. We show, for the first time to our knowledge, that ... ...

Abstract	Fabry-Perot cavities are central to many optical measurement systems. In high-precision experiments, such as aLIGO and AdVirgo, coupled cavities are often required, leading to complex optical behavior. We show, for the first time to our knowledge, that discrete linear canonical transforms (LCTs) can be used to compute circulating optical fields for cavities in which the optics have arbitrary apertures, reflectance and transmittance profiles, and shape. We compare the predictions of LCT models with those of alternative methods. To further highlight the utility of the LCT, we present a case study of point absorbers on the aLIGO mirrors and compare it with recently published results.
Language	English
Publishing date	2021-10-06
Publishing country	United States
Document type	Journal Article
ZDB-ID	283633-6
ISSN	1520-8532 ; 1084-7529 ; 0740-3232
ISSN (online)	1520-8532
ISSN	1084-7529 ; 0740-3232
DOI	10.1364/JOSAA.433575
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Article ; Online: Mode matching error signals using radio-frequency beam shape modulation.

Ciobanu, A A / Brown, D D / Veitch, P J / Ottaway, D J

Applied optics

2020 Volume 59, Issue 31, Page(s) 9884–9895

Abstract: Precise mode matching is needed to maximize performance in coupled cavity interferometers such as Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO). In this paper, we present a new mode matching sensing scheme, to the best of our ... ...

Abstract	Precise mode matching is needed to maximize performance in coupled cavity interferometers such as Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO). In this paper, we present a new mode matching sensing scheme, to the best of our knowledge, that uses a single radio-frequency higher-order-mode sideband and single-element photodiodes. It is first-order insensitive to misalignment and can serve as an error signal in a closed loop control system for a set of mode matching actuators. We also discuss how it may be implemented in Advanced LIGO. The proposed mode matching error signal has been successfully demonstrated on a tabletop experiment, where the error signal increased the mode matching of a beam to a cavity to 99.9%.
Language	English
Publishing date	2020-11-11
Publishing country	United States
Document type	Journal Article
ISSN	1539-4522
ISSN (online)	1539-4522
DOI	10.1364/AO.404646
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Article ; Online: Resonantly diode-pumped continuous-wave and Q-switched Er:YAG laser at 1645 nm.

Chang, N W H / Simakov, N / Hosken, D J / Munch, J / Ottaway, D J / Veitch, P J

Optics express

2010 Volume 18, Issue 13, Page(s) 13673–13678

Abstract: We describe an efficient Er:YAG laser that is resonantly pumped using continuous-wave (CW) laser diodes at 1470 nm. For CW lasing, it emits 6.1 W at 1645 nm with a slope efficiency of 36%, the highest efficiency reported for an Er:YAG laser that is ... ...

Abstract	We describe an efficient Er:YAG laser that is resonantly pumped using continuous-wave (CW) laser diodes at 1470 nm. For CW lasing, it emits 6.1 W at 1645 nm with a slope efficiency of 36%, the highest efficiency reported for an Er:YAG laser that is pumped in this manner. In Q-switched operation, the laser produces diffraction-limited pulses with an average power of 2.5 W at 2 kHz PRF. To our knowledge this is the first Q-switched Er:YAG laser resonantly pumped by CW laser diodes.
MeSH term(s)	Infrared Rays ; Lasers, Semiconductor ; Lasers, Solid-State ; Models, Theoretical ; Optics and Photonics/instrumentation ; Optics and Photonics/methods
Language	English
Publishing date	2010-06-21
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1491859-6
ISSN	1094-4087 ; 1094-4087
ISSN (online)	1094-4087
ISSN	1094-4087
DOI	10.1364/OE.18.013673
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Article ; Online: Feedback control of thermal lensing in a high optical power cavity.

Fan, Y / Zhao, C / Degallaix, J / Ju, L / Blair, D G / Slagmolen, B J J / Hosken, D J / Brooks, A F / Veitch, P J / Munch, J

The Review of scientific instruments

2008 Volume 79, Issue 10, Page(s) 104501

Abstract: This paper reports automatic compensation of strong thermal lensing in a suspended 80 m optical cavity with sapphire test mass mirrors. Variation of the transmitted beam spot size is used to obtain an error signal to control the heating power applied to ... ...

Abstract	This paper reports automatic compensation of strong thermal lensing in a suspended 80 m optical cavity with sapphire test mass mirrors. Variation of the transmitted beam spot size is used to obtain an error signal to control the heating power applied to the cylindrical surface of an intracavity compensation plate. The negative thermal lens created in the compensation plate compensates the positive thermal lens in the sapphire test mass, which was caused by the absorption of the high intracavity optical power. The results show that feedback control is feasible to compensate the strong thermal lensing expected to occur in advanced laser interferometric gravitational wave detectors. Compensation allows the cavity resonance to be maintained at the fundamental mode, but the long thermal time constant for thermal lensing control in fused silica could cause difficulties with the control of parametric instabilities.
Language	English
Publishing date	2008-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/1.2982239
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Article: Compensation of strong thermal lensing in high-optical-power cavities.

Zhao, C / Degallaix, J / Ju, L / Fan, Y / Blair, D G / Slagmolen, B J J / Gray, M B / Lowry, C M Mow / McClelland, D E / Hosken, D J / Mudge, D / Brooks, A / Munch, J / Veitch, P J / Barton, M A / Billingsley, G

Physical review letters

2006 Volume 96, Issue 23, Page(s) 231101

Abstract: In an experiment to simulate the conditions in high optical power advanced gravitational wave detectors, we show for the first time that the time evolution of strong thermal lenses follows the predicted infinite sum of exponentials (approximated by a ... ...

Abstract	In an experiment to simulate the conditions in high optical power advanced gravitational wave detectors, we show for the first time that the time evolution of strong thermal lenses follows the predicted infinite sum of exponentials (approximated by a double exponential), and that such lenses can be compensated using an intracavity compensation plate heated on its cylindrical surface. We show that high finesse approximately 1400 can be achieved in cavities with internal compensation plates, and that mode matching can be maintained. The experiment achieves a wave front distortion similar to that expected for the input test mass substrate in the Advanced Laser Interferometer Gravitational Wave Observatory, and shows that thermal compensation schemes are viable. It is also shown that the measurements allow a direct measurement of substrate optical absorption in the test mass and the compensation plate.
Language	English
Publishing date	2006-06-16
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.96.231101
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Article ; Online: Point Absorber Limits to Future Gravitational-Wave Detectors.

Jia, Wenxuan / Yamamoto, Hiroaki / Kuns, Kevin / Effler, Anamaria / Evans, Matthew / Fritschel, Peter / Abbott, R / Adams, C / Adhikari, R X / Ananyeva, A / Appert, S / Arai, K / Areeda, J S / Asali, Y / Aston, S M / Austin, C / Baer, A M / Ball, M / Ballmer, S W /

Banagiri, S / Barker, D / Barsotti, L / Bartlett, J / Berger, B K / Betzwieser, J / Bhattacharjee, D / Billingsley, G / Biscans, S / Blair, C D / Blair, R M / Bode, N / Booker, P / Bork, R / Bramley, A / Brooks, A F / Brown, D D / Buikema, A / Cahillane, C / Cannon, K C / Chen, X / Ciobanu, A A / Clara, F / Compton, C M / Cooper, S J / Corley, K R / Countryman, S T / Covas, P B / Coyne, D C / Datrier, L E H / Davis, D / Di Fronzo, C / Dooley, K L / Driggers, J C / Dupej, P / Dwyer, S E / Etzel, T / Evans, T M / Feicht, J / Fernandez-Galiana, A / Frolov, V V / Fulda, P / Fyffe, M / Giaime, J A / Giardina, K D / Godwin, P / Goetz, E / Gras, S / Gray, C / Gray, R / Green, A C / Gustafson, E K / Gustafson, R / Hall, E D / Hanks, J / Hanson, J / Hardwick, T / Hasskew, R K / Heintze, M C / Helmling-Cornell, A F / Holland, N A / Jones, J D / Kandhasamy, S / Karki, S / Kasprzack, M / Kawabe, K / Kijbunchoo, N / King, P J / Kissel, J S / Kumar, Rahul / Landry, M / Lane, B B / Lantz, B / Laxen, M / Lecoeuche, Y K / Leviton, J / Liu, J / Lormand, M / Lundgren, A P / Macas, R / MacInnis, M / Macleod, D M / Mansell, G L / Márka, S / Márka, Z / Martynov, D V / Mason, K / Massinger, T J / Matichard, F / Mavalvala, N / McCarthy, R / McClelland, D E / McCormick, S / McCuller, L / McIver, J / McRae, T / Mendell, G / Merfeld, K / Merilh, E L / Meylahn, F / Mistry, T / Mittleman, R / Moreno, G / Mow-Lowry, C M / Mozzon, S / Mullavey, A / Nelson, T J N / Nguyen, P / Nuttall, L K / Oberling, J / Oram, Richard J / Osthelder, C / Ottaway, D J / Overmier, H / Palamos, J R / Parker, W / Payne, E / Pele, A / Penhorwood, R / Perez, C J / Pirello, M / Radkins, H / Ramirez, K E / Richardson, J W / Riles, K / Robertson, N A / Rollins, J G / Romel, C L / Romie, J H / Ross, M P / Ryan, K / Sadecki, T / Sanchez, E J / Sanchez, L E / Saravanan, T R / Savage, R L / Schaetzl, D / Schnabel, R / Schofield, R M S / Schwartz, E / Sellers, D / Shaffer, T / Sigg, D / Slagmolen, B J J / Smith, J R / Soni, S / Sorazu, B / Spencer, A P / Strain, K A / Sun, L / Szczepańczyk, M J / Thomas, M / Thomas, P / Thorne, K A / Toland, K / Torrie, C I / Traylor, G / Tse, M / Urban, A L / Vajente, G / Valdes, G / Vander-Hyde, D C / Veitch, P J / Venkateswara, K / Venugopalan, G / Viets, A D / Vo, T / Vorvick, C / Wade, M / Ward, R L / Warner, J / Weaver, B / Weiss, R / Whittle, C / Willke, B / Wipf, C C / Xiao, L / Yu, Hang / Yu, Haocun / Zhang, L / Zucker, M E / Zweizig, J

Physical review letters

2021 Volume 127, Issue 24, Page(s) 241102

Abstract: High-quality optical resonant cavities require low optical loss, typically on the scale of parts per million. However, unintended micron-scale contaminants on the resonator mirrors that absorb the light circulating in the cavity can deform the surface ... ...

Abstract	High-quality optical resonant cavities require low optical loss, typically on the scale of parts per million. However, unintended micron-scale contaminants on the resonator mirrors that absorb the light circulating in the cavity can deform the surface thermoelastically and thus increase losses by scattering light out of the resonant mode. The point absorber effect is a limiting factor in some high-power cavity experiments, for example, the Advanced LIGO gravitational-wave detector. In this Letter, we present a general approach to the point absorber effect from first principles and simulate its contribution to the increased scattering. The achievable circulating power in current and future gravitational-wave detectors is calculated statistically given different point absorber configurations. Our formulation is further confirmed experimentally in comparison with the scattered power in the arm cavity of Advanced LIGO measured by in situ photodiodes. The understanding presented here provides an important tool in the global effort to design future gravitational-wave detectors that support high optical power and thus reduce quantum noise.
Language	English
Publishing date	2021-12-24
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.127.241102
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Article ; Online: Approaching the motional ground state of a 10-kg object.

Whittle, Chris / Hall, Evan D / Dwyer, Sheila / Mavalvala, Nergis / Sudhir, Vivishek / Abbott, R / Ananyeva, A / Austin, C / Barsotti, L / Betzwieser, J / Blair, C D / Brooks, A F / Brown, D D / Buikema, A / Cahillane, C / Driggers, J C / Effler, A / Fernandez-Galiana, A / Fritschel, P /

Frolov, V V / Hardwick, T / Kasprzack, M / Kawabe, K / Kijbunchoo, N / Kissel, J S / Mansell, G L / Matichard, F / McCuller, L / McRae, T / Mullavey, A / Pele, A / Schofield, R M S / Sigg, D / Tse, M / Vajente, G / Vander-Hyde, D C / Yu, Hang / Yu, Haocun / Adams, C / Adhikari, R X / Appert, S / Arai, K / Areeda, J S / Asali, Y / Aston, S M / Baer, A M / Ball, M / Ballmer, S W / Banagiri, S / Barker, D / Bartlett, J / Berger, B K / Bhattacharjee, D / Billingsley, G / Biscans, S / Blair, R M / Bode, N / Booker, P / Bork, R / Bramley, A / Cannon, K C / Chen, X / Ciobanu, A A / Clara, F / Compton, C M / Cooper, S J / Corley, K R / Countryman, S T / Covas, P B / Coyne, D C / Datrier, L E H / Davis, D / Di Fronzo, C / Dooley, K L / Dupej, P / Etzel, T / Evans, M / Evans, T M / Feicht, J / Fulda, P / Fyffe, M / Giaime, J A / Giardina, K D / Godwin, P / Goetz, E / Gras, S / Gray, C / Gray, R / Green, A C / Gustafson, E K / Gustafson, R / Hanks, J / Hanson, J / Hasskew, R K / Heintze, M C / Helmling-Cornell, A F / Holland, N A / Jones, J D / Kandhasamy, S / Karki, S / King, P J / Kumar, Rahul / Landry, M / Lane, B B / Lantz, B / Laxen, M / Lecoeuche, Y K / Leviton, J / Liu, J / Lormand, M / Lundgren, A P / Macas, R / MacInnis, M / Macleod, D M / Márka, S / Márka, Z / Martynov, D V / Mason, K / Massinger, T J / McCarthy, R / McClelland, D E / McCormick, S / McIver, J / Mendell, G / Merfeld, K / Merilh, E L / Meylahn, F / Mistry, T / Mittleman, R / Moreno, G / Mow-Lowry, C M / Mozzon, S / Nelson, T J N / Nguyen, P / Nuttall, L K / Oberling, J / Oram, Richard J / Osthelder, C / Ottaway, D J / Overmier, H / Palamos, J R / Parker, W / Payne, E / Penhorwood, R / Perez, C J / Pirello, M / Radkins, H / Ramirez, K E / Richardson, J W / Riles, K / Robertson, N A / Rollins, J G / Romel, C L / Romie, J H / Ross, M P / Ryan, K / Sadecki, T / Sanchez, E J / Sanchez, L E / Saravanan, T R / Savage, R L / Schaetz, D / Schnabel, R / Schwartz, E / Sellers, D / Shaffer, T / Slagmolen, B J J / Smith, J R / Soni, S / Sorazu, B / Spencer, A P / Strain, K A / Sun, L / Szczepańczyk, M J / Thomas, M / Thomas, P / Thorne, K A / Toland, K / Torrie, C I / Traylor, G / Urban, A L / Valdes, G / Veitch, P J / Venkateswara, K / Venugopalan, G / Viets, A D / Vo, T / Vorvick, C / Wade, M / Ward, R L / Warner, J / Weaver, B / Weiss, R / Willke, B / Wipf, C C / Xiao, L / Yamamoto, H / Zhang, L / Zucker, M E / Zweizig, J

Science (New York, N.Y.)

2021 Volume 372, Issue 6548, Page(s) 1333–1336

Abstract: The motion of a mechanical object, even a human-sized object, should be governed by the rules of quantum mechanics. Coaxing them into a quantum state is, however, difficult because the thermal environment masks any quantum signature of the object's ... ...

Abstract	The motion of a mechanical object, even a human-sized object, should be governed by the rules of quantum mechanics. Coaxing them into a quantum state is, however, difficult because the thermal environment masks any quantum signature of the object's motion. The thermal environment also masks the effects of proposed modifications of quantum mechanics at large mass scales. We prepared the center-of-mass motion of a 10-kilogram mechanical oscillator in a state with an average phonon occupation of 10.8. The reduction in temperature, from room temperature to 77 nanokelvin, is commensurate with an 11 orders-of-magnitude suppression of quantum back-action by feedback and a 13 orders-of-magnitude increase in the mass of an object prepared close to its motional ground state. Our approach will enable the possibility of probing gravity on massive quantum systems.
Language	English
Publishing date	2021-06-17
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	128410-1
ISSN	1095-9203 ; 0036-8075
ISSN (online)	1095-9203
ISSN	0036-8075
DOI	10.1126/science.abh2634
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Article ; Online: Quantum-Enhanced Advanced LIGO Detectors in the Era of Gravitational-Wave Astronomy.

Tse, M / Yu, Haocun / Kijbunchoo, N / Fernandez-Galiana, A / Dupej, P / Barsotti, L / Blair, C D / Brown, D D / Dwyer, S E / Effler, A / Evans, M / Fritschel, P / Frolov, V V / Green, A C / Mansell, G L / Matichard, F / Mavalvala, N / McClelland, D E / McCuller, L /

McRae, T / Miller, J / Mullavey, A / Oelker, E / Phinney, I Y / Sigg, D / Slagmolen, B J J / Vo, T / Ward, R L / Whittle, C / Abbott, R / Adams, C / Adhikari, R X / Ananyeva, A / Appert, S / Arai, K / Areeda, J S / Asali, Y / Aston, S M / Austin, C / Baer, A M / Ball, M / Ballmer, S W / Banagiri, S / Barker, D / Bartlett, J / Berger, B K / Betzwieser, J / Bhattacharjee, D / Billingsley, G / Biscans, S / Blair, R M / Bode, N / Booker, P / Bork, R / Bramley, A / Brooks, A F / Buikema, A / Cahillane, C / Cannon, K C / Chen, X / Ciobanu, A A / Clara, F / Cooper, S J / Corley, K R / Countryman, S T / Covas, P B / Coyne, D C / Datrier, L E H / Davis, D / Di Fronzo, C / Driggers, J C / Etzel, T / Evans, T M / Feicht, J / Fulda, P / Fyffe, M / Giaime, J A / Giardina, K D / Godwin, P / Goetz, E / Gras, S / Gray, C / Gray, R / Gupta, Anchal / Gustafson, E K / Gustafson, R / Hanks, J / Hanson, J / Hardwick, T / Hasskew, R K / Heintze, M C / Helmling-Cornell, A F / Holland, N A / Jones, J D / Kandhasamy, S / Karki, S / Kasprzack, M / Kawabe, K / King, P J / Kissel, J S / Kumar, Rahul / Landry, M / Lane, B B / Lantz, B / Laxen, M / Lecoeuche, Y K / Leviton, J / Liu, J / Lormand, M / Lundgren, A P / Macas, R / MacInnis, M / Macleod, D M / Márka, S / Márka, Z / Martynov, D V / Mason, K / Massinger, T J / McCarthy, R / McCormick, S / McIver, J / Mendell, G / Merfeld, K / Merilh, E L / Meylahn, F / Mistry, T / Mittleman, R / Moreno, G / Mow-Lowry, C M / Mozzon, S / Nelson, T J N / Nguyen, P / Nuttall, L K / Oberling, J / Oram, R J / O'Reilly, B / Osthelder, C / Ottaway, D J / Overmier, H / Palamos, J R / Parker, W / Payne, E / Pele, A / Perez, C J / Pirello, M / Radkins, H / Ramirez, K E / Richardson, J W / Riles, K / Robertson, N A / Rollins, J G / Romel, C L / Romie, J H / Ross, M P / Ryan, K / Sadecki, T / Sanchez, E J / Sanchez, L E / Saravanan, T R / Savage, R L / Schaetzl, D / Schnabel, R / Schofield, R M S / Schwartz, E / Sellers, D / Shaffer, T J / Smith, J R / Soni, S / Sorazu, B / Spencer, A P / Strain, K A / Sun, L / Szczepańczyk, M J / Thomas, M / Thomas, P / Thorne, K A / Toland, K / Torrie, C I / Traylor, G / Urban, A L / Vajente, G / Valdes, G / Vander-Hyde, D C / Veitch, P J / Venkateswara, K / Venugopalan, G / Viets, A D / Vorvick, C / Wade, M / Warner, J / Weaver, B / Weiss, R / Willke, B / Wipf, C C / Xiao, L / Yamamoto, H / Yap, M J / Yu, Hang / Zhang, L / Zucker, M E / Zweizig, J

Physical review letters

2019 Volume 123, Issue 23, Page(s) 231107

Abstract: The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in the direct measurement of gravitational waves ... ...

Abstract	The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in the direct measurement of gravitational waves with the Advanced LIGO H1 and L1 detectors. This achievement is the culmination of decades of research to implement squeezed states in gravitational-wave detectors. During the ongoing O3 observation run, squeezed states are improving the sensitivity of the LIGO interferometers to signals above 50 Hz by up to 3 dB, thereby increasing the expected detection rate by 40% (H1) and 50% (L1).
Language	English
Publishing date	2019-12-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.123.231107
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Article ; Online: First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO.

Blair, Carl / Gras, Slawek / Abbott, Richard / Aston, Stuart / Betzwieser, Joseph / Blair, David / DeRosa, Ryan / Evans, Matthew / Frolov, Valera / Fritschel, Peter / Grote, Hartmut / Hardwick, Terra / Liu, Jian / Lormand, Marc / Miller, John / Mullavey, Adam / O'Reilly, Brian / Zhao, Chunnong / Abbott, B P /

Abbott, T D / Adams, C / Adhikari, R X / Anderson, S B / Ananyeva, A / Appert, S / Arai, K / Ballmer, S W / Barker, D / Barr, B / Barsotti, L / Bartlett, J / Bartos, I / Batch, J C / Bell, A S / Billingsley, G / Birch, J / Biscans, S / Biwer, C / Bork, R / Brooks, A F / Ciani, G / Clara, F / Countryman, S T / Cowart, M J / Coyne, D C / Cumming, A / Cunningham, L / Danzmann, K / Da Silva Costa, C F / Daw, E J / DeBra, D / DeSalvo, R / Dooley, K L / Doravari, S / Driggers, J C / Dwyer, S E / Effler, A / Etzel, T / Evans, T M / Factourovich, M / Fair, H / Fernández Galiana, A / Fisher, R P / Fulda, P / Fyffe, M / Giaime, J A / Giardina, K D / Goetz, E / Goetz, R / Gray, C / Gushwa, K E / Gustafson, E K / Gustafson, R / Hall, E D / Hammond, G / Hanks, J / Hanson, J / Harry, G M / Heintze, M C / Heptonstall, A W / Hough, J / Izumi, K / Jones, R / Kandhasamy, S / Karki, S / Kasprzack, M / Kaufer, S / Kawabe, K / Kijbunchoo, N / King, E J / King, P J / Kissel, J S / Korth, W Z / Kuehn, G / Landry, M / Lantz, B / Lockerbie, N A / Lundgren, A P / MacInnis, M / Macleod, D M / Márka, S / Márka, Z / Markosyan, A S / Maros, E / Martin, I W / Martynov, D V / Mason, K / Massinger, T J / Matichard, F / Mavalvala, N / McCarthy, R / McClelland, D E / McCormick, S / McIntyre, G / McIver, J / Mendell, G / Merilh, E L / Meyers, P M / Mittleman, R / Moreno, G / Mueller, G / Munch, J / Nuttall, L K / Oberling, J / Oppermann, P / Oram, Richard J / Ottaway, D J / Overmier, H / Palamos, J R / Paris, H R / Parker, W / Pele, A / Penn, S / Phelps, M / Pierro, V / Pinto, I / Principe, M / Prokhorov, L G / Puncken, O / Quetschke, V / Quintero, E A / Raab, F J / Radkins, H / Raffai, P / Reid, S / Reitze, D H / Robertson, N A / Rollins, J G / Roma, V J / Romie, J H / Rowan, S / Ryan, K / Sadecki, T / Sanchez, E J / Sandberg, V / Savage, R L / Schofield, R M S / Sellers, D / Shaddock, D A / Shaffer, T J / Shapiro, B / Shawhan, P / Shoemaker, D H / Sigg, D / Slagmolen, B J J / Smith, B / Smith, J R / Sorazu, B / Staley, A / Strain, K A / Tanner, D B / Taylor, R / Thomas, M / Thomas, P / Thorne, K A / Thrane, E / Torrie, C I / Traylor, G / Vajente, G / Valdes, G / van Veggel, A A / Vecchio, A / Veitch, P J / Venkateswara, K / Vo, T / Vorvick, C / Walker, M / Ward, R L / Warner, J / Weaver, B / Weiss, R / Weßels, P / Willke, B / Wipf, C C / Worden, J / Wu, G / Yamamoto, H / Yancey, C C / Yu, Hang / Yu, Haocun / Zhang, L / Zucker, M E / Zweizig, J

Physical review letters

2017 Volume 118, Issue 15, Page(s) 151102

Abstract: Interferometric gravitational wave detectors operate with high optical power in their arms in order to achieve high shot-noise limited strain sensitivity. A significant limitation to increasing the optical power is the phenomenon of three-mode parametric ...

Abstract	Interferometric gravitational wave detectors operate with high optical power in their arms in order to achieve high shot-noise limited strain sensitivity. A significant limitation to increasing the optical power is the phenomenon of three-mode parametric instabilities, in which the laser field in the arm cavities is scattered into higher-order optical modes by acoustic modes of the cavity mirrors. The optical modes can further drive the acoustic modes via radiation pressure, potentially producing an exponential buildup. One proposed technique to stabilize parametric instability is active damping of acoustic modes. We report here the first demonstration of damping a parametrically unstable mode using active feedback forces on the cavity mirror. A 15 538 Hz mode that grew exponentially with a time constant of 182 sec was damped using electrostatic actuation, with a resulting decay time constant of 23 sec. An average control force of 0.03 nN was required to maintain the acoustic mode at its minimum amplitude.
Language	English
Publishing date	2017-04-14
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.118.151102
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Effects of transients in LIGO suspensions on searches for gravitational waves.

Walker, M / Abbott, T D / Aston, S M / González, G / Macleod, D M / McIver, J / Abbott, B P / Abbott, R / Adams, C / Adhikari, R X / Anderson, S B / Ananyeva, A / Appert, S / Arai, K / Ballmer, S W / Barker, D / Barr, B / Barsotti, L / Bartlett, J /

Bartos, I / Batch, J C / Bell, A S / Betzwieser, J / Billingsley, G / Birch, J / Biscans, S / Biwer, C / Blair, C D / Bork, R / Brooks, A F / Ciani, G / Clara, F / Countryman, S T / Cowart, M J / Coyne, D C / Cumming, A / Cunningham, L / Danzmann, K / Da Silva Costa, C F / Daw, E J / DeBra, D / DeRosa, R T / DeSalvo, R / Dooley, K L / Doravari, S / Driggers, J C / Dwyer, S E / Effler, A / Etzel, T / Evans, M / Evans, T M / Factourovich, M / Fair, H / Fernández Galiana, A / Fisher, R P / Fritschel, P / Frolov, V V / Fulda, P / Fyffe, M / Giaime, J A / Giardina, K D / Goetz, E / Goetz, R / Gras, S / Gray, C / Grote, H / Gushwa, K E / Gustafson, E K / Gustafson, R / Hall, E D / Hammond, G / Hanks, J / Hanson, J / Hardwick, T / Harry, G M / Heintze, M C / Heptonstall, A W / Hough, J / Izumi, K / Jones, R / Kandhasamy, S / Karki, S / Kasprzack, M / Kaufer, S / Kawabe, K / Kijbunchoo, N / King, E J / King, P J / Kissel, J S / Korth, W Z / Kuehn, G / Landry, M / Lantz, B / Lockerbie, N A / Lormand, M / Lundgren, A P / MacInnis, M / Márka, S / Márka, Z / Markosyan, A S / Maros, E / Martin, I W / Martynov, D V / Mason, K / Massinger, T J / Matichard, F / Mavalvala, N / McCarthy, R / McClelland, D E / McCormick, S / McIntyre, G / Mendell, G / Merilh, E L / Meyers, P M / Miller, J / Mittleman, R / Moreno, G / Mueller, G / Mullavey, A / Munch, J / Nuttall, L K / Oberling, J / Oliver, M / Oppermann, P / Oram, Richard J / O'Reilly, B / Ottaway, D J / Overmier, H / Palamos, J R / Paris, H R / Parker, W / Pele, A / Penn, S / Phelps, M / Pierro, V / Pinto, I / Principe, M / Prokhorov, L G / Puncken, O / Quetschke, V / Quintero, E A / Raab, F J / Radkins, H / Raffai, P / Reid, S / Reitze, D H / Robertson, N A / Rollins, J G / Roma, V J / Romie, J H / Rowan, S / Ryan, K / Sadecki, T / Sanchez, E J / Sandberg, V / Savage, R L / Schofield, R M S / Sellers, D / Shaddock, D A / Shaffer, T J / Shapiro, B / Shawhan, P / Shoemaker, D H / Sigg, D / Slagmolen, B J J / Smith, B / Smith, J R / Sorazu, B / Staley, A / Strain, K A / Tanner, D B / Taylor, R / Thomas, M / Thomas, P / Thorne, K A / Thrane, E / Torrie, C I / Traylor, G / Tuyenbayev, D / Vajente, G / Valdes, G / van Veggel, A A / Vecchio, A / Veitch, P J / Venkateswara, K / Vo, T / Vorvick, C / Ward, R L / Warner, J / Weaver, B / Weiss, R / Weßels, P / Willke, B / Wipf, C C / Worden, J / Wu, G / Yamamoto, H / Yancey, C C / Yu, Hang / Yu, Haocun / Zhang, L / Zucker, M E / Zweizig, J

The Review of scientific instruments

2017 Volume 88, Issue 12, Page(s) 124501

Abstract: This paper presents an analysis of the transient behavior of the Advanced LIGO (Laser Interferometer Gravitational-wave Observatory) suspensions used to seismically isolate the optics. We have characterized the transients in the longitudinal motion of ... ...

Abstract	This paper presents an analysis of the transient behavior of the Advanced LIGO (Laser Interferometer Gravitational-wave Observatory) suspensions used to seismically isolate the optics. We have characterized the transients in the longitudinal motion of the quadruple suspensions during Advanced LIGO's first observing run. Propagation of transients between stages is consistent with modeled transfer functions, such that transient motion originating at the top of the suspension chain is significantly reduced in amplitude at the test mass. We find that there are transients seen by the longitudinal motion monitors of quadruple suspensions, but they are not significantly correlated with transient motion above the noise floor in the gravitational wave strain data, and therefore do not present a dominant source of background noise in the searches for transient gravitational wave signals. Using the suspension transfer functions, we compared the transients in a week of gravitational wave strain data with transients from a quadruple suspension. Of the strain transients between 10 and 60 Hz, 84% are loud enough that they would have appeared above the sensor noise in the top stage quadruple suspension monitors if they had originated at that stage at the same frequencies. We find no significant temporal correlation with the suspension transients in that stage, so we can rule out suspension motion originating at the top stage as the cause of those transients. However, only 3.2% of the gravitational wave strain transients are loud enough that they would have been seen by the second stage suspension sensors, and none of them are above the sensor noise levels of the penultimate stage. Therefore, we cannot eliminate the possibility of transient noise in the detectors originating in the intermediate stages of the suspension below the sensing noise.
Language	English
Publishing date	2017-12
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/1.5000264
Database	MEDical Literature Analysis and Retrieval System OnLINE

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