The 820DIB12 is a 12.5 mm diameter Standard Interference Bandpass Filter, specifically designed to operate at a central wavelength of 820nm. This filter is sourced from Knight Optical, a reputable vendor known for their high-quality optical elements.
The filter is a Bandpass type, which means it allows transmission of light within a specific range of wavelengths while blocking other wavelengths. In this case, the cut-on wavelength is 815nm, and the cut-off wavelength is 825nm, ensuring a tight bandpass around the central wavelength.
The 820DIB12 is made from UVFS MAL-1965, a material known for its optical properties and durability. The filter has a thickness of 6.1mm, which is typical for this type of optical component. The coating on both the front and back surfaces of the filter is KNI 820DIB, a proprietary coating developed by Knight Optical for enhanced performance.
The filter's shape is that of a Thin Lens, which implies that it can focus light to a certain extent, adding to its versatility. The filter is currently in stock and available for immediate purchase through the vendor's website.