40Z40ER.1 In Stock

The 40Z40ER.1 by Newport is a Broadband Dielectric Mirror that features exceptional operational efficiency, spanning an expansive wavelength spectrum from 450 nm to 700 nm. Coated with precision-enhanced aluminum, the mirror boasts heightened reflective capabilities within both the visible and near-infrared (NIR) domains, accommodating angles of incidence ranging from 0° to 45°. The 101.6 mm diameter of the mirror is underpinned by a robust 17.7 mm thick Zerodur substrate. This specialized substrate, composed of glass-ceramic material, distinguishes itself with its virtually imperceptible thermal expansion. This attribute ensures remarkable stability, particularly for applications demanding the utmost in diffraction-limited performance. The 40Z40ER.1 has an average reflectivity surpassing 93%, a surface flatness measured at λ/20, and a surface quality of 10-5. Notably, the aluminum film adorning the mirror's surface boasts an additional layer of protection in the form of a multilayer dielectric stack. This enhancement not only fortifies the durability of the coating but also serves to amplify the overall reflectance of the mirror.