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.