66-247 25 mm Dia. N-BK7 45 deg Reflective Magenta Dichroic Filter; t=4 mm 400-465/635-725nm

The 66-247 is a 25 mm diameter dichroic filter, designed with a 45-degree angle of incidence and featuring a magenta color. This filter is sourced from Edmund Optics, a reputable vendor known for its high-quality optical components. The item data indicates that it is made of N-BK7 Schott, a popular glass type in the optical industry due to its excellent optical properties.

The filter's primary function is to reflect and transmit light within specific wavelength ranges. The cut-on wavelength is 605 nm, and the cut-off wavelength is 495 nm. This means that it allows light with wavelengths between 400-465 nm and 635-725 nm to pass through while reflecting light outside these ranges. This characteristic makes it suitable for applications that require the separation of certain wavelength bands.

The filter has a circular shape and a thickness of 4 mm, which is relatively thin for an optical component. This thinness can be advantageous in applications where space is limited or weight needs to be minimized. The coating on both the front and back surfaces is EDM 66-244, which is likely a proprietary coating developed by Edmund Optics for specific optical performance.