650FH90-50S 50x50mm Standard Long Wave Pass Edge Filter, Cut-on 650nm

The 650FH90-50S is a Longpass Filter from Andover Corporation, designed with a standard rectangular shape and thin lens characteristics. This filter is made of fused sil mal-1965, a high-quality material known for its durability and optical clarity.

The filter has a width of 50mm and a height of 50mm, making it suitable for various optical applications. It boasts a thickness of 3mm, ensuring robustness and stability during operation. The filter's primary function is to pass long waves, specifically those with a wavelength of 650nm, while blocking or attenuating shorter wavelengths.

The 650FH90-50S features a cut-on of 650nm, indicating the wavelength at which the filter starts to transmit light. It has no specified cut-off, suggesting that it continues to transmit light at all longer wavelengths. This characteristic makes it ideal for applications that require the transmission of longer wavelengths, such as infrared (IR) imaging or heat detection systems.

Both the front and back surfaces of the filter are coated with Andover's proprietary 650FH90 coating, enhancing its performance and longevity. The filter's availability is currently in stock, according to the vendor's website link provided: https://www.andovercorp.com/products/edge-filters/long-wave-pass/.