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| Coad | 669238 | Substrate | UVFS | |
| Type | Zero-Order Quarter-Wave Plate | Diameter(mm) | 12.70 | |
| Thickness | - | Wavelength(nm) | 266 | |
| Mechanical Housing | SM05-8A (Lens Tube, SM05 Internal & External Threads) | Shell Diameter | 17.8 + 0.00/-0.05mm | |
| Outer Shell Thickness | 11.3mm | Clear Aperture（mm） | 10.00 | |
| Parallelism | <10 arcsec | Optical Retardance | λ/4 | |
| Delay Accuracy | ±λ/300 | Delay Uniformity | - | |
| AOI | - | Surface Quality | 20-10 | |
| Operating Temperature | - | Fast Axis Accuracy | - | |
| Transmission Wavefront Deviation | λ/8@633nm | Laser Damage Threshold | - | |
| Coating Type | V-Type Anti-Reflection Coating | Coating Specifications | Ravg<0.25%@266nm,AOI=6° |
LBTEK quartz air-gap zero-order quarter-wave plate is made of two quartz plates with a spacer in between, where the fast axes of the two quartz plates are perpendicular to each other, and the phase difference between them is π/2. The waveplate is pre-installed in a black anodized bracket for easy installation and use. Quarter-wave plates are commonly used to convert linearly polarized light into circularly polarized light. Compared to the bonded quartz crystal zero-order waveplates, the air-gap zero-order waveplate has an air gap formed by a spacer between the two quartz plates. This structure is suitable for high-power laser applications. LBTEK offers quartz zero-order waveplates with clear apertures of Ø10.0 mm and Ø20.0 mm. The Ø10.0 mm waveplates are available with both one-inch mounts and SM05 threaded mounts, while the Ø20.0 mm waveplates are available with only one-inch mounts. Additionally, LBTEK provides polymer true zero-order half-wave plates and quarter-wave plates, which are less affected by wavelength shifts and incident angles.
LBTEK zero-order quarter-wave plates are insensitive to temperature and have a delay of λ/4. They are commonly used to convert linearly polarized light into circularly polarized light. The waveplate with an SM05 threaded mount is installed in a black anodized SM05-8A lens tube, with fine lines engraved on the end face of the housing to indicate the fast axis direction of the waveplate. The circumference of the housing is engraved with the waveplate model, delay value, design wavelength, and other relevant details. This waveplate can be connected to other components via the SM05 internal and external threads. In the SM05 threaded mount, the waveplate is fixed using an SM05R retaining ring and O-ring. The waveplate without a bracket can be removed using a wrench (OWR-05A). The fast axis direction of the waveplate without a bracket is marked on the side with a pencil.
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