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Max-Planck-Institut für Gravitationsphysik Albert-Einstein-Institut

Institut für Atom- und Molekülphysik. Optical Layout of GEO600. ROC = 666m. Michelson Interferometer. Mode Cleaners. Laser. 300W at Beam Splitter. 98.65%. 2W. 1W. 10W. ROC = 687 m. Dark Fringe vs. Heater Power. 687 m. 666 m. Michelson Error Point PRC reflected Power.

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Max-Planck-Institut für Gravitationsphysik Albert-Einstein-Institut

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  1. Institut für Atom- und Molekülphysik Optical Layout of GEO600 ROC = 666m Michelson Interferometer Mode Cleaners Laser 300W at Beam Splitter 98.65% 2W 1W 10W ROC = 687 m Dark Fringe vs. Heater Power 687 m 666 m Michelson Error Point PRC reflected Power Michelson Error Point PRC reflected Power 51W 60W 30W PRC Overcoupled 71W 74W 66W PRCImpedance matched PRC Undercoupled 9 4.5 0 -4.5 -9 45 40 35 30 25 Displacement [nm] 1.9 1.6 1.4 1.1 0.8 0.550.3 0 Temperature [°C] Radius [cm] 0 5 10 z [cm] Thermal Compensation of the Radius of Curvature of GEO600 Mirrors H. Lück, S. Hild, S. Goßler, K. Kawabe and the GEO 600 team Max-Planck-Institut für Gravitationsphysik Albert-Einstein-Institut Introduction • Power Recycling ~2000 +mismatch in the Radius of Curvature (ROC) of the far mirrorspoor contrast @ beam splitter. • Poor contrast degrades error signals and makes locking impossible. • GEO600 far mirrors have a mismatch in ROC of about 3%. • Thermal gradient created by a ring heater deforms the mirror and corrects the ROC. Compensation Concept Simulation Results Results from Finite Element Analysis of the mirror expansion Analytical calculation of the temperature distribution in the mirror substrate Intracavity vs. Dark Fringe Power Far East Mirror & Heater

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