66-246 25 mm Dia. N-BK7 45 deg Reflective Yellow Dichroic Filter; t=4 mm 400-725nm

The 66-246 is a 25 mm diameter dichroic filter, designed with a 45-degree angle of incidence and featuring a reflective yellow coating. This filter is sourced from Edmund Optics, a renowned vendor in the optical industry, and is available for purchase through their official website. The filter's catalog number is 66-246, and it can be found on their website with a "Valid - in stock" status, indicating immediate availability.

The filter is made from N-BK7 Schott, a high-quality optical glass known for its excellent transparency and low auto-fluorescence. The filter's geometry includes a 25 mm diameter and a 4 mm thickness, making it suitable for various optical applications. The physical data of the filter includes a cut-on wavelength of 0 nm and a cut-off wavelength of 520 nm, indicating its ability to transmit light within this range.

The coating of the filter is a crucial aspect of its functionality. Both the front and back surfaces of the filter are coated with EDM 66-243, a proprietary coating developed by Edmund Optics. This coating enhances the filter's performance, particularly in terms of its reflective properties and wavelength specificity.

The filter's shape is that of a thin lens, which is beneficial for applications that require minimal optical path length distortion. This feature, combined with its high-quality material and precise coating, makes the 66-246 an excellent choice for various optical systems that require a reflective yellow dichroic filter.