One of the main noise sources encountered during the commissioning of 1st generation gravitational wave detectors is stray light. The actual sensitivity of the GEO600 GW-detector could potentially be degraded by stray light contributions of the order 1e-20 W. I'm going to describe the experience that was gained by studying stray light effects in the GEO600 interferometer and try to give a brief guide how to avoid, identify and eliminate stray light noise.

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