Magnesium Fluoride (MgF2) Windows offer excellent broadband transmission from the deep-UV to the mid-infrared. DUV transmission makes them ideal for use at the Hydrogen Lyman-alpha line and for UV radiation sources and receivers, as well as excimer laser applications. MgF2 is a rugged material resistant to chemical etching, laser damage, and mechanical and thermal shock. It has a Knoop Hardness of 415 and index of refraction of 1.38. Key features: • Excellent Transmission from 120nm to 7μm • Rugged and Durable • Resistant to Chemical Etching Specifications Material: MgF2 single crystal Optical Axis Orientation: A-cut ( <100>-cut ) +/- 0.5° Diameter tolerance: + 0 / -0.10 mm Thickness tolerance: + / - 0.10 mm Clear aperture: 90% of the diameter Surface quality: 20-10 scratch and dig Surface accuracy: Lambda/4 @ 632.8 nm Perpendicularity: < 10 arc min Parallelism: 15 arc seconds