Envin design and manufacture Filters and coatings for the 2 – 8 micron region. These filters consist of very thick layer structures (tens of microns) which must have excellent adhesion properties in order that they are environmentally stable.
The coating materials must be chosen carefully for use in this region and must be compatible with the chosen substrates. These include Sapphire, Silicon, Gemanium Zinc Selenide, Zinc Sulphide, Calcium Fluoride & Chalcogenide glasses. All coating materials are non Radioactive.
Filter types include Bandpass, Longpass, Shortpass, High Reflector, Beamsplitter and Notch. Antireflection coatings are also available.
All of these Filters are hard, durable and environmentally stable and can therefore be produced in a variety of shapes and sizes. This final sizing step is carried out at Envin where finished filters are produced from 1mm square to >100mm diameter. Thickness can be as low as 0.2mm and special considerations such as flatness and parallelism are routinely catered for.
Detailed Optical performance measurements are made using the highest standard Spectrophotometers (Perkin Elmer Lambda 900 & 983G).
Envin is able to offer a complete service from Coating and Filter design to prototyping and full manufacture covering the Ultraviolet, Visible and Infrared regions. Custom products are a speciality of the company.