01 Mar 2013 Silicon (Si) Windows manufactured from optical grade silicon are popular for the 1.2 - 7µm spectral region due to their low cost and low density. Due to its low density, silicon is ideal for weight sensitive applications, especially those in the 3 - 5µm region. Density is 2.329 g/cm3 and Knoop Hardness is 1150, making it harder and less brittle than germanium.
Lasertec provide Si material with advantage as:
Transmission from 1.2 - 7µm
Available Uncoated or AR Coated for 3 - 5µm
Ideal for Weight Sensitive Applications
Attribute Specification
Typical Diameter (Φmm) 8.0, 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 38.1, 50.8, 100.0
Typical Thickness (mm) 1.0 ～ 50.0
Diameter Tolerance (mm) +0.0/-0.2 (General), +0.0/-0.1 (High Precision)
Thickness Tolerance (mm) ±0.2 (General), ±0.05 (High Precision)
Clear Aperture >80% (Small Size), >90% (Large Size)
Parallelism 3 min. (General), 10 sec. (High Precision)
Surface Quality 60/40 (General), 10/5 (High Precision)
Roughness Ra (nm) <1 nm (roughness test report)
Flatness (per 25mm@633nm) λ/2(General), λ/10 (High Precision)
Bevel (face width x 45°) <0.25mm
Coating Uncoated, AR, HR, PR, Coating, etc.
Note for Silicon Window:
(1). Custom-made Silicon windows at any size are available.
Besides round, shape of quadrate, triangular, or other polygonal are available.
(2). Thickness from 1.0mm to 80.0 mm is available upon request.
(3). Better bevel is available upon request.
(4). Si Windows with Anti-Reflective(AR), High-Reflective(HR), Partial-Reflective(PR) coating are available.
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