LBTEK offers sapphire precision windows, which are uncoated and can be applied in the wavelength range of 200 nm to 4.5 μm. Sapphire has extremely high surface hardness and can only be scratched by a few substances. Additionally, sapphire exhibits excellent chemical stability, remaining insoluble in water, common acids, and alkalis even at temperatures up to 1000°C. The transmittance range of sapphire windows covers from the ultraviolet to the mid-infrared spectrum, with high transmittance across the entire wavelength range. For details, see the transmittance curve.