LBTEK Spiral Phase Plate is a diffractive optical element that modulates the beam phase by varying the material height along the azimuthal direction, thereby generating vortex beams. When an incident plane wave passes through the spiral phase plate, it produces a vortex beam with a helical phase wavefront—the output beam propagates helically along the optical axis, resulting in destructive interference at the optical axis and forming a doughnut-shaped intensity distribution with a central null. The spiral phase plate offers advantages including high efficiency and stability, ease of operation, and high LIDT. It has been widely applied in various fields such as optical tweezers, high-resolution microscopy, information processing, and surface profilometry. Compared to liquid crystal polymers, UVFS exhibits low absorption characteristics, making it more compatible with UV wavelength applications. LBTEK offers standard spiral phase plates with operating wavelengths of 355 nm, 532 nm, and 1064 nm, with topological charge m available in 1 and 2. Custom specifications are also available—please contact LBTEK Technical Support for details.