66-242 12.5 mm Dia. N-BK7 45 deg Reflective Cyan Dichroic Filter; t=3 mm 400-725nm

The 66-242 is a high-quality dichroic filter, boasting a 12.5 mm diameter and a thickness of 3 mm, sourced from the renowned optical components vendor, Edmund Optics. This filter is designed with a 45-degree angle of incidence and features a reflective cyan coating, making it an ideal choice for applications that require precise wavelength control and reflection.

The filter's material composition is N-BK7 Schott, a widely used optical glass due to its excellent optical properties and high homogeneity. This material ensures high transmission and low absorption across the visible spectrum, making the 66-242 particularly suitable for applications in the 400-725 nm range.

The 66-242's coating is a crucial component of its design. The front and back surfaces are coated with the EDM 66-242 coating, which is specifically designed to provide high reflectivity for the cyan wavelength band while maintaining high transmission for other wavelengths. This coating is applied using advanced vacuum deposition techniques, ensuring uniformity, durability, and high performance.

The filter's thin lens shape allows for easy integration into various optical systems. Furthermore, the cut-on and cut-off wavelengths are 0 nm and 590 nm, respectively, indicating that this filter is designed to reflect cyan wavelengths while transmitting others.