Glan Laser Polarizer Glan Laser prism is made from natural calcite crystal birefringent polarization devices, mainly composed of CaCO3 hexahedral orthorhombic crystals. The prism is used in the air-gap structure, escape windows, it can be used for high power laser systems. Wavelength coverage ultraviolet, visible, mid-infrared. Product parameters: finish :20-10 Aperture:> 90% Wavefront Distortion: λ / 4@632.8nm Damage Threshold:> 500MW/CM2 Coating: AR coating