Projection systems have the unique advantage that they can produce large images from compact devices. The specialized UHP and Ujoy lamps enabled a tremendous progress towards compact and highly efficient systems. Beyond the existing markets of rear and professional front projection new applications are possible addressing personal projection and micro-projection. These new applications can profit from laser light sources. Today laser technology is still costly and complicated especially for green wavelengths. Several competing approaches for a green laser are reviewed and the basic requirements of a laser source for projection are described.
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