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Device for maintaining the focus position of a laser beam fixed on a surface behind a slit aperture.
Several laser applications require the laser beam to be accurately focused on a surface or detector. To achieve this, deviations caused by temperature fluctuations of the components must be compensated for. Also, in case the laser source is a light valve, a single beam must be selected for focusing. Care must be taken to single out the wanted beam while reflection of laser light back into the laser source or light valve must be avoided to prevent damaging them. The technology described here answers this need.applications laser imaging film printing plate focal point precisely positioned surface imaged

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