Beam homogenizer utilizes prolonged scattering to convert a collimated incident light beam into a uniform intensity distribution beam of a specific shape. It can achieve the desired spot shape for any input wavelength. The main advantage of a laser homogenizer is its insensitivity to variations in beam quality and intensity of the incident laser, allowing it to effectively homogenize lasers with lower beam quality or insufficient stability. The laser homogenizer can maintain a uniform spot while still achieving sharp boundaries and high optical energy efficiency, and the quality of the output spot is significantly related to the parameters of the input laser. It is used in many applications requiring uniform intensity spots, such as laser drilling, ablation, scribing, marking, cutting, welding, as well as laser testing, inspection, medical treatments, and cosmetic procedures like freckle removal.