When a Gaussian power distribution laser beam is converted into a uniform power density beam by a converging homogenizing DOE and is divided into a plurality of homogenized beams by a diverging DOE, the power of the separated beam spatially fluctuates. For alleviating the power fluctuation of the beams,...http://www.google.com/patents/US6909546?utm_source=gb-gplus-sharePatent US6909546 - Multipoint lump homogenizing optical system
