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Using one arm of the Michelson interferometer and the power recycling mirrorof the interferometric gravitational wave detector GEO600, we created aFabry-Perot cavity with a length of 1200 m. The main purpose of this experimentwas to gather first experience with the main optics, its suspensions and thecorresponding control systems. The residual displacement of a main mirror isabout 150 nm rms. By stabilising the length of the 1200 m long cavity to thepre-stabilised laser beam we achieved an error point frequency noise of 0.1mHz/sqrt(Hz) at 100 Hz Fourier frequency. In addition we demonstrated thereliable performance of all included subsystems by several 10-hour-periods ofcontinuous stable operation. Thus the full frequency stabilisation scheme forGEO600 was successfully tested.Comment: Amaldi 4 (Perth 2001) conference proceedings, 10 pages, 8 figure

Performance of a 1200 m long suspended Fabry–Perot cavity