Abstract
A novel dynamic solid state lighting (SSL) module is demonstrated, allowing users to program the direction, brightness, divergence and shape of a projected white light in a variety of lighting applications. The module is enabled by a fast beams-teering MEMS mirror with high optical power handling. In order to produce and project bright white light, the module illuminates a phosphor target with a high power laser of several Watts. A projection lens projects the phosphor target into a cone of light of up to 60°. This light projection is arbitrarily shaped and dynamically programmable by controlling a MEMS mirror scan head to address specific portions of the proper target. An adjustable focus lens in the scan head further allows control of projected beam divergence. Successful prototypes were demonstrated with both a single 445nm laser diode source (2.5W laser power). While the prototypes have to date been limited by available power of the laser sources, it is estimated that the novel MEMS mirror scan head design allows >10W (CW) operation on a 2mm without multilayer dielectric coatings. The introduction of dynamic laser beam steering is a paradigm shift toward a new generation of solid state lighting (SSL) with real-time control of ”lighting content”.
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