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Silicon Spherical lenses

Code Type Focal lgth (mm) Dia. mm) Back FL (mm) Rad_ (mm) Rad_ (mm) C/T (mm) Edge thick Form Mat Coating Des. Grd Notes Price Buy & More ...
LSI1185-XS - 19.7 16 - 46.9 Plano 1.5 - Plano
Silicon AR/AR Tavg>95% @1.9-2.6 micron - 2 Coating damage $30.00 More Info..

Silicon (Si) is one of the hardest IR materials available for use between NIR/IR between 1µm to 6µm. Transmission starts to decrease between 6-10 µm to zero and then increases to over 50% between 50-100 µm.
Silicon lenses have transmission of just over 50% between the 1 to 6µm and above 50µm to over 100 µm, so antireflective coatings are advisable for improving transmission.
Silicon has a high refractive index of around 3.4 but lower than germanium. Silicon has lower density so ideal for less weighty lens designs between 3-5 µm.
Silicon is generally used as lenses in the 3 to 5µm (MWIR) waveband, and also as windows and optical filter substrates within this band as 3 to 5µm which is important for the detection of sources radiating at a black body temperature of 700K, such as mortar fire or as the muzzle flash sniper rifles. Silicon also has a high thermal capacity so is a good choice for use in laser mirrors.

Diameter: +0/-0.2mm
Focal length: +/-2%
Thickness: +/-0.2mm
Surface quality: 60-40 scratch/ dig

If you require Silicon Lenses up to 10” diameter and BBAR/ DLC coated for 3-5µm.

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