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.
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...[Show more]
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