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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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
Journal	Review of Scientific Instruments
Volume	79
Issue number	10
DOIs	https://doi.org/10.1063/1.2982239
Publication status	Published - 2008

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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.",

author = "Y. Fan and C. Zhao and J. Degallaix and L. Ju and Blair, {D. G.} and Slagmolen, {B. J.J.} and Hosken, {D. J.} and Brooks, {A. F.} and Veitch, {P. J.} and J. Munch",

year = "2008",

doi = "10.1063/1.2982239",

language = "English",

volume = "79",

journal = "Review of Scientific Instruments",

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TY - JOUR

T1 - Feedback control of thermal lensing in a high optical power cavity

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

Y1 - 2008

N2 - 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.

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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DO - 10.1063/1.2982239

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VL - 79

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JF - Review of Scientific Instruments

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Feedback control of thermal lensing in a high optical power cavity

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