LBTEK offers blazed gratings with design wavelengths of 300 nm, 500 nm, 750 nm, 1000 nm, 1250 nm, and 1500 nm, and groove densities of 300 lines/mm, 600 lines/mm, and 1200 lines/mm. These gratings are coated with an aluminum film. The optimal diffraction efficiency of LBTEK's blazed gratings at the blaze wavelength can reach between 60% and 80%. For custom requirements regarding other sizes or wavelengths, please contact LBTEK technical support. Note: The aluminum film is not coated with an SiO2 protective layer. Avoid contact with fingerprints and aerosols. When cleaning dust from the surface, only use clean dry air or nitrogen to blow away the dust. Additionally, be aware that the metal film is chemically unstable and prone to oxidation and degradation due to environmental temperature and humidity. It is recommended to store the grating in a dry cabinet after use. The grating surface may have minor cosmetic imperfections that do not affect performance, and the grating remains a qualified product.