�� Specifications:
�� Material: Crystal quartz
�� Dimension Tolerance: +0.0, -0.2mm
�� Wavefront Distortion: ��/8 @ 632.8 nm
�� Retardation Tolerance: <��/300
�� Wavelength Range: 240-2100nm
�� Parallelism: < 1 arc second
�� Surface Quality: 20-10 scratch and dig
�� AR/AR Coating: R< 0.2% at central wavelength