Quartz Achromatic Half-Wave Plate AWP20H-T4Q
Half-wave plates commonly rotate linear polarization while maintaining intensity to control source polarization. Unlike standard zero-order plates, achromatic plates provide stable phase retardance over a broadband wavelength range, unaffected by incident wavelength. JCOPTIX achromatic half-wave plates combine birefringent quartz and magnesium fluoride crystals with an air gap. Aligning the quartz fast axis and magnesium-fluoride slow axis balances and cancels relative retardance shifts across the band, leaving a net half-wave retardance. Efficient broadband AR coatings on each crystal ensure excellent transmitted wavefront quality and minimize beam deviation and surface-reflection losses. Flat response particularly suits tunable lasers, multiline lasers, and broadband sources. The air-spaced design raises the damage threshold for high-power use. JCOPTIX plates with 10 mm and 20 mm clear apertures have standard SM05 or SM1 external threads; 45 mm clear-aperture plates mount in externally threaded SM2 lens tubes. They install directly in corresponding internally threaded rotation mounts such as MMR-05T, MMR-1T, and MMR-2T. 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 achromatic plate into the rotation mount until the SM05/SM1 thread reaches its end; lock the rotating part as needed. 2. Check the difference between the fast-axis direction (white housing line) and the target scale mark (0° or 90°). 3. Apply slight force to continue turning the protruding cylindrical part until the white fast-axis line aligns with the target mark. Adjustment is approximately 60°. JCOPTIX offers mounted achromatic plates with 10 mm and 20 mm clear apertures covering 400-700 nm, 700-1100 nm, and 1100-1650 nm. Contact technical support for custom sizes, coatings, or bands.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | Quartz Crystal & MgF₂ |
| Crystal Diameter | 22.5 mm |
| Clear Aperture Dimension | 20.0 mm |
| Operating Wavelength | 1100-1650 nm |
| Retardance | λ/2 |
| Retardance accuracy | ± λ/100 |
| Transmitted wavefront error [@633 nm] | λ/8 |
| Coating R_avg [1100-1650 nm (6° AOI, Single Side)] | R_avg<0.5% @1100-1650 nm (6° AOI, Single Side) |
| Damage Threshold [5 J/cm² at 1542 nm, 10 ns, 10 Hz, Ø0.189 mm] | 5 J/cm² (1542 nm, 10 ns, 10 Hz, Ø0.189 mm) |
| Surface parallelism | < 10 arcsec |
| Surface quality (scratch/dig) | 40/20 |
Key Features
Datasheet
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