True Zero-Order Waveplate

Specifications:
Material: Crystal Quartz
Dimension Tolerance: +0.0, -0.2 mm
Wavefront Distortion:<λ /8 @ 632.8 nm
Retardation Tolerance: <λ /300
Wavelength Range: 400-2100 nm
Parallelism: <1 arc second
Surface Quality: 20-10 scratch and dig
AR/AR Coating:R<0.2% at central wavelength

Cemented True Zero-Order Waveplate