Silicon single crystal is usually used as the substrate of 3-5μm mid-wave infrared optical window and optical filter. It is a common material for making laser mirror, infrared temperature measurement and infrared optical lens because of its good thermal conductivity and low density.
Infrared optics are used to collect, focus or collimate light in the near infrared (NIR), short wave infrared (SWIR), mid wave infrared (MWIR) or long wave infrared (LWIR) spectra. The infrared spectrum falls into the 700 – 16000 nm wavelengths, with each spectral range as follows.
NIR 700 – 900nm
SWIR 900 – 2300nm
MWIR 3000 – 5000nm
LWIR 8000 – 14000nm
Witness samples allow testing without handling the actual part, to ensure the coating process is accurate before moving forward with the optical component. And after coating, the witness samples are often used to measure reflectivity, transmission, and polarization, as well as humidity, temperature, durability, and salt fog tests. The witness material is should be the same as the substrate material and is almost always the industry standard of roughly 1” (25 mm/25.4mm) in diameter to accommodate the size of standard spectrophotometers tooling .
UV.VIS. IR windows
Intrinsic have very strong ability for the optical windows, we have three fabrication technique of pitch polishing, double side polishing and contact polishing to supply windows size from 1.2mm to 350mm with thickness from 0.12mm to 60mm, and the shape can be round, square, drilled, step, and customized based on our CNC machines. Usually we need CAD drawing to work with customized shape windows.
ICC windows can reach high level precision like s/d 10-5; flatness 1/10l@633nm; parallelism less than 5min; bevel 0.1-0.25mm; Ra <1nm based on testing devices of ZyGO, AFM, 15sec gonimeter, and 2D imaging system.
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