Feedback control of thermal lensing in a high optical power cavity

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

doi:10.1063/1.2982239

Feedback control of thermal lensing in a high optical power cavity

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

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11 Citations (Scopus)

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.

Original language	English
Article number	104501
Number of pages	5
Journal	Review of Scientific Instruments
Volume	79
Issue number	10
DOIs	https://doi.org/10.1063/1.2982239
Publication status	Published - Oct 2008
Externally published	Yes

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title = "Feedback control of thermal lensing in a high optical power cavity",

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.",

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AU - Fan, Y.

AU - Zhao, C.

AU - Degallaix, J.

AU - Ju, L.

AU - Blair, D. G.

AU - Slagmolen, B. J. J.

AU - Hosken, D. J.

AU - Brooks, A. F.

AU - Veitch, P. J.

AU - Munch, J.

PY - 2008/10

Y1 - 2008/10

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AB - 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.

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Feedback control of thermal lensing in a high optical power cavity

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