47-263 12.5 mm Dia. N-BK7 45 deg Reflective Red Dichroic Filter; t=3 mm 400-750nm

The 47-263 is a 12.5 mm diameter Dichroic Filter, specifically designed for reflecting a narrow band of light centered at 588 nm while transmitting all other wavelengths in the 400-750 nm range. This filter is sourced from Edmund Optics, a renowned vendor known for their high-quality optical components.

The filter is made from N-BK7 Schott glass, a popular material due to its excellent optical properties and high damage threshold. It has a 45-degree angle of incidence, which is often used to minimize beam deviation and reduce the risk of total internal reflection. The filter's thickness is 3 mm, providing sufficient mechanical strength while maintaining minimal optical path differences.

The coating on both the front and back surfaces of the filter is EDM 47-263. This coating is designed to enhance the filter's performance, ensuring high reflectivity at the specified wavelength and high transmittance for all other wavelengths. The filter is cut-on at 615 nm, meaning it starts to transmit light at this wavelength, and there is no specified cut-off wavelength, indicating that it continues to transmit light up to the specified upper limit of 750 nm.

The filter's geometry is that of a thin lens, suggesting that it may have some focusing or diverging properties. However, without additional information, it is not possible to quantify these properties.