GU Optics offer standard λ/2 and λ/4 retardance Air Gap Zero-Order Laser Waveplates in sizes 12.7mm and 25.4mm, which are specially designed for wavelengths of 355nm, 532nm, 632.8nm, 780nm, 850nm, 1064nm, 1550nm . Air gap zero-order waveplates are formed by fixing two quartz waveplates through a bracket, its optical axis is orthogonal. It can produce zero-order phase delay in application due to the thickness difference between the two waveplates, the air gap zero-order waveplates have the characteristics of low influence of temperature change and wavelength change, accurate phase delay and high laser damage threshold. Therefore, these waveplates are used in laser device, laser system, education and scientific research, laser processing and other products related fields. We can provide customized waveplates according to your requirements.