Having a similar transmission range to CaF2, MgF2 is often the best option for low frequency applications. The 157 Grade is the highest quality option, with great transmission at 157 nm.
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A10174-2-CF | Magnesium Fluoride (MgF2) Viewport, 157 Grade, UHV Rated Vacuum Optics, 0.90″ View Dia, 2.75″ Conflat Flange