LBTEK engineered diffuser products include two types: polymer engineered diffusers and fused silica engineered diffusers. The former utilizes polymer and glass substrates, while the latter is based on fused silica. Both types feature precisely constructed, regularly arranged, and independently adjustable microstructural units on the surface, enabling effective control over the intensity distribution of incident light, producing non-Gaussian beam profiles, and maintaining high transmittance over a wide wavelength range. The resulting homogenized beam profiles come in various shapes, including rectangular, circular, square, and linear, offering flexibility to meet different optical application requirements. Compared to traditional diffusers, engineered diffusers provide higher precision in controlling the divergence angle of the beam, improving the controllability and uniformity of the output beam. We offer uninstalled engineered diffusers.