硅（Si）是可用的最坚硬的矿物和光学材料之一，用于近红外（1µm）至约6µm。光学质量硅通常掺杂有其他矿物，以防止在传输波段内出现吸收带。
规格
Material: Sapphire
Diameter: +0.0/-0.1mm
Centring Accuracy: <5’
Focal Length: ±2.0%
Centre Thickness: ±0.25mm
Surface Quality (S/D): <60/40’
Diameter: +0.0 / -0.20 mm
Length / width: ±0.1 mm
Thickness: ±0.1 mm
Flatness: <5λ
Surface quality: <60-40 scratch/dig
Parallelism: 5 arc min
LENSES: Diameter 3mm to 100mm+
PRISMS: Lengths / Widths 3mm to 50mm+
WINDOWS: Diameter 2mm to 300mm+
AR Coatings are available on all
