The invention relates to a device for homogenizing radiation, preferably light, with the help of chirped microlens arrays (cMLA) which, unlike standard regular microlens arrays (rMLA), are an arrangement of non-identical lenses in an array. Non-identical means that the lens parameters in the array, e.g. the radius of curvature, free diameter, vertex position, and other parameters, can vary from one lens or cell to another. The parameters of each lens or cell can be (analytically, numerically) determined by means of functions which are preferably dependent on the position of the cell or lens within the array.