Achromatic Waveplate Features: High Precision Phase Retardation Broad Spectral Bandwidth Better Temperature Bandwidth High Damage Threshold Cemented and Optically Contact Are Also Available Applications: Projector IDVD, CD, Camera Optical Measurement Systems Tunable Lasers Specifications Achromatic Waveplate Parameter Unit Material Crystal Quartz Diameter Tolerance mm +0.0/-0.1 Parallelism arc seconds