645FDL12 12.5 mm Dia. Longpass Dichroic Filter 645nm

The 645FDL12 is a Dichroic Filter, specifically a Longpass Filter with a 645nm 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 use in compact optical systems. It is made from N-BK7 Schott, a popular optical glass due to its excellent optical properties and high damage threshold.

The 645FDL12 features a dichroic coating on both the front and back surfaces, identified as 'kni 645fdl-0'. This coating is designed to reflect or transmit light at specific wavelengths, in this case, passing wavelengths above 645nm and blocking those below.

The physical data of the filter indicates a cut-on wavelength of 645nm and a cut-off wavelength of 0nm. This means that the filter starts to transmit light at 645nm and continues to transmit all longer wavelengths, while blocking all shorter wavelengths.

The filter is currently in stock and available for purchase on Knight Optical's website. For more information, please refer to the provided weblink.