66-244 12.5 mm Dia. N-BK7 45 deg Reflective Magenta Dichroic Filter; t=3 mm 400-465/635-725nm

The 66-244 is a 12.5 mm diameter dichroic filter with a 45-degree angle of incidence, manufactured by Edmund Optics. This filter is made from N-BK7 Schott glass, a popular choice for its excellent optical properties and high damage threshold. The N-BK7 Schott glass is a crown glass with a low refractive index and low dispersion, making it an ideal material for various optical applications.

The filter is designed to reflect light in the magenta spectrum, specifically between 400-465nm and 635-725nm. This is achieved through a specialized coating on both the front and back surfaces, denoted as 'edm 66-244'. The coating is thin, contributing to the filter's overall thickness of 3mm.

The 66-244 filter is cut on at 605nm and cut off at 495nm, indicating its transmission characteristics. This makes it suitable for applications that require the selective reflection or transmission of light in the specified wavelength ranges.

The filter is shaped as a thin lens, which can be beneficial in certain optical systems where a lens-like element is required. The catalog number for this item is 66-244, and it is currently in stock, according to the vendor's website.