LBTEK crystalline quartz Air-spaced Zero-Order Half-Waveplate is assembled from two crystalline quartz waveplates with a spacer sandwiched between them. The fast axes of the two crystalline quartz waveplates are perpendicular to each other, and the phase delay difference between them is π. It is commonly used to rotate the polarization direction of linearly polarized light without changing the intensity of the linearly polarized light. Compared with cemented crystalline quartz Zero-Order Waveplate, in the Air-spaced Zero-Order Waveplate, the two crystalline quartz waveplates are separated by a spacer to form an air gap; this structure is suitable for higher-power Laser applications. The crystalline quartz Air-spaced Zero-Order Half-Waveplate kit consists of 10 waveplates with the same Design Wavelength and Ø12.7 mm. The side edge of each waveplate has a D-shaped cut edge, which can be used to identify the fast Axis direction of the waveplate. The Design Wavelength of the waveplate kit includes common wavelengths used in fields such as laser cooling, atomic clocks, and precision measurement in Quantum Technologies: 509 nm, 556 nm, 671 nm, 780 nm, 795 nm, 813 nm, 852 nm, 1013 nm. In addition to standard crystalline quartz Air-spaced Zero-Order Half-Waveplates, LBTEK also provides a variety of custom solution options, including custom special dimensions, Design Wavelength, and phase delay values, etc. For specific custom requirements, please contact LBTEK technical support.