Quartz Achromatic Half-Wave Plate AWP45H-T3Q
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 | 50.0 mm |
| Clear Aperture Dimension | 45.0 mm |
| Operating Wavelength | 700-1100 nm |
| Retardance | λ/2 |
| Retardance accuracy | ± λ/100 |
| Transmitted wavefront error [@633 nm] | λ/4 |
| Coating R_avg [700-1100 nm (6° AOI, Single Side)] | R_avg<0.5% @700-1100 nm (6° AOI, Single Side) |
| Damage Threshold [0.432 J/cm² corresponds to 797 nm,180 fs,1 kHz,Ø0.178 mm; 5 J/cm² corresponds to 810 nm,10 ns,10 Hz,Ø0.157 mm.] | 0.432 J/cm² (797 nm, 180 fs, 1 kHz, Ø0.178 mm)， 5 J/cm² (810 nm, 10 ns, 10 Hz, Ø0.157 mm) |
| Surface parallelism | < 15 arcsec |
| Surface quality (scratch/dig) | 80/50 |
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Datasheet
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