The use of lasers as illumination sources in projection systems would provide numerous advantages compared to standard projection lamps. For example, they can provide a larger color gamut, a longer lifetime and they emit a highly directional beam and smaller and cheaper projection optics can be used. However, when laser light is scattered from a rough surface (like a projection screen), an unwanted quasi-random interference pattern emerges. This interference pattern is called “speckle” pattern (dt. Sprenkler, Tupfer) and drastically degrades the image quality in projection systems. I investigate different effective and efficient methods for laser speckle reduction in projection systems.