490FDL12 12.5 mm Dia. Longpass Dichroic Filter 490nm

The 490FDL12 is a Dichroic Filter, specifically a Longpass Filter with a 490nm cut-on wavelength, sourced from Knight Optical. This filter is designed for use in optical systems that require the separation or blocking of specific wavelengths of light.

The filter is circular in shape, with a diameter of 12.5mm and a thickness of 1.1mm, making it suitable for a wide range of applications. It is made from N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties and durability.

The 490FDL12 features a dichroic coating on both the front and back surfaces, identified as 'kni 490fdl-0'. This coating is designed to reflect or transmit light at specific wavelengths, depending on the direction of incidence. In this case, the filter allows light with a wavelength of 490nm and longer to pass through, while blocking or reflecting shorter wavelengths.

The physical data of the filter indicates a cut-on wavelength of 490nm and a cut-off wavelength of 0nm. This means that the filter starts transmitting light at 490nm and continues to do so for all longer wavelengths.

The filter is classified as a Thin Lens, suggesting that it may have some degree of focusing or diverging effect on light passing through it. However, the specific optical power of the lens is not provided in the item data.

The 490FDL12 is currently in stock and available for purchase from Knight Optical. More information, including technical specifications and purchasing details, can be found on the product webpage.