Quartz Air-Spaced Zero-Order Half-Wave Plate ZWP20H-830Q
Half-wave plates commonly rotate the polarization direction of linearly polarized light while maintaining intensity, controlling polarization from lasers or other narrowband sources. JCOPTIX quartz air-spaced zero-order half-wave plates combine two multiple-order quartz plates with an air gap and can be used with high-power diode or tunable lasers. One plate's fast axis aligns with the other's slow axis, so net retardance is the difference between their phase retardances. Compared with multiple-order plates, zero-order plates offer several advantages: reduced wavelength sensitivity, ideal for laser diodes or tunable lasers; reduced temperature sensitivity, since thermal changes in the quartz plates cancel, limiting retardance changes over a wide temperature range; and high-power suitability, because an air gap instead of optical adhesive within the clear aperture gives a higher damage threshold. JCOPTIX standard air-spaced zero-order housings have SM05 external threads for 10 mm clear-aperture plates or SM1 external threads for 20 mm clear-aperture plates, allowing direct installation in matching internally threaded rotation mounts such as MMR-05T and MMR-1T. JCOPTIX's proprietary rubber washer at the external-thread base enables direct alignment with specific mount angles. Operation is simple and quick: 1. Screw the zero-order plate into the rotation mount until the SM05/SM1 thread reaches its end; lock the rotating part as needed. 2. Check the angular difference between the fast-axis direction (white housing line) and the target scale mark (0° or 90°). 3. Apply slight force to continue rotating the protruding cylindrical part until the fast-axis white line aligns with the target mark. The adjustment range is approximately 60°. JCOPTIX offers mounted quartz air-spaced zero-order plates with 10 mm and 20 mm clear apertures. Housings are engraved with model, design wavelength, and fast-axis direction for quick identification. Contact technical support for custom sizes, coatings, or wavelengths.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | Quartz Crystal |
| Clear Aperture Dimension | 20.0 mm |
| Operating Wavelength | 830 nm |
| Retardance | λ/2 |
| Retardance accuracy | ± λ/300 |
| Antireflection Coating R_abs [Design wavelength, 6° angle of incidence, per surface] | R_abs< 0.25% @ design wavelength (6° angle of incidence, per surface) |
| Transmitted wavefront error [@633 nm] | λ/8 |
| Surface parallelism | < 10 arcsec |
| Surface quality (scratch/dig) | 20/10 |
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