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Laser wires will play an importand role as the standard monitor for beam
size measurements with micrometer resolution for the beam delivery system
at any future linear collider. Some R&D work is still necessary to elevate
preliminary laser wire designs to a compact, non-invasive and fast-scanning
device. In this paper the latest R&D together with recent measurements and
simulations are presented. Schemes to measure the beam size in a bunch train and from train-to-train are presented together with a complete
evaluation of scanning techniques meeting these requirements. Different laser systems are assessed for their use in linear collider and damping ring
scenarios. Results from simulations and measurements with a laser focus system and of a proposed Compton calorimeter are
reported. Furthermore plans are outlined for the installation of a fast laser wire experiment at
the PETRA accelerator at DESY.
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