Techspec Silicon Plano-Convex Lenses are ideally suited for a variety of infrared (IR) applications including Near-Infrared (NIR) imaging and IR spectroscopy. The precision lenses are available in a variety of focal lengths from 25-250 mm. The lenses are offered uncoated and may be coated with a wide range of our own custom IR coatings.
As compared to other IR materials, Techspec Silicon Plano-Convex Lenses are manufactured of low-cost, low-density silicon and are perfect for the 1.2 - 7µm wavelength range. Silicon features a density of 2.329 g/cm3 and an index of refraction of 3.422. This density is less than half that of Germanium or Zinc Selenide and makes these lenses ideally suited for applications, especially those in the 3 - 5µm region, where weight sensitivity is a priority. Another outstanding feature of silicon is that it will react with halogens and dilute alkalis, but is inert to most acids. Silicon features a Knoop Hardness rating of 1,150—harder and less brittle than Germanium, for robustness and excellent durability.