A Fused Silica Spiral Phase Plate (SPP) is a highly specialized optical component designed to manipulate the phase of light by introducing a continuously varying optical path across its surface. Unlike conventional optical lenses or filters that primarily control the direction

Fused silica is widely recognized for its superior optical characteristics. It offers excellent transparency across ultraviolet (UV), visible, and near-infrared wavelength ranges while maintaining extremely low optical absorption. The material also exhibits low thermal expansion, exceptional chemical resistance, and high laser damage thresholds.