LBTEK Custom Diffractive Optical Elements (DOEs) are specially designed and fabricated according to customer requirements using micro-nano fabrication processes. By patterning two-dimensional structures at micrometer and nanometer scales onto a flat substrate surface, these elements reshape incident beams into arbitrary spot profiles with high efficiency. Typical custom DOE functions include beam homogenization, beam splitting, focus shaping, and ring shaping. Laser direct writing is one of the primary technologies for fabricating diffractive optical elements. Various microstructures can be fabricated by modulating the power density, spot size, and polarization state of the exposure beam. The LBTEK laser direct writing system uses a polarization-adjustable laser beam to expose birefringent material on the substrate surface. By controlling the exposure spot size and beam polarization direction, the arrangement of liquid crystal molecules on the substrate is modified. After development following exposure, the corresponding micro-nano structure pattern is formed on the substrate surface. For customization details, please contact LBTEK Technical Support.