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True Zero-Order Waveplates
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Specifications：
| Material | Crystal Quartz |
| Diameter Tolerance | +0/-0.2mm |
| Retardance Accuracy | ＜λ/300 |
| Clear Aperture | ≥ central 90% of diameter |
| Surface Quality | 20/10 |
| Wavefront Distortion | λ/8 @ 632.8nm over the clear aperture |
| Parallelism | ≤10″ |
| Coating | R＜0.25% per surface at design wavelength |
| Damage Threshold | 500W/cm2,4J/cm2，20ns |
Order Information：
True Zero-Order Waveplates：
| Half Waveplate | Quarter Waveplate |
| WPT-100-1/2-λ | WPT-100-1/4-λ |
| WPT-127-1/2-λ | WPT-127-1/4-λ |
| WPT-200-1/2-λ | WPT-200-1/4-λ |
| WPT-254-1/2-λ | WPT-254-1/4-λ |
Note：
• Custom designs for other sizes, coatings and holder are also available upon request.
• CASTECH’s standard coatings are available.
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