Magnesium fluoride, MgF2, crystals have been widely used as windows, lenses, and prisms for wavelength from 110 nm to 7.5 um. It is the most suitable material for ArF excimer lasers used in pulsed laser deposition techniques. For its excellent ulta-violet transmittance at 193nm, it is effective as optical polarizing element. 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. Magnesium Fluoride or MgF2 is grown by vacuum Stockbarger technique in ingots approximately 120mm in diameter.