Abstract
For many years there has been a sustained worldwide effort to develop suitable detectors for gravitational waves, predicted to exist by Einstein but as yet undetected. At present there are several ground-based long-baseline laser interferometric detectors under construction, and within the next two to three years these detectors should be in operation. In this review the basic operating principles of such detectors will be presented, and the key noise sources will be reviewed. The current status of laser interferometric detectors will be presented and the prospects for future improvements to the sensitivity of such detectors will be considered. This review will cover primarily ground-based detectors, with a brief look at the proposed space-based detector LISA.

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