Crystal Calcium Fluoride Magnesium Fluoride and Sapphire
1. Calcium Fluoride
Calcium Fluoride (CaF2) single crystal is an optical material with high transmittance in ultraviolet, visible and infrared regions of the spectrum: 0.15 μm ~ 9 μm range. Calcium Fluoride is widespread used for optical windows, lenses and prisms in the IR application; especially pure grades find useful application in the UV and as UV Eximer (High power applications) laser windows.
2. Magnesium Fluoride
Magnesium Fluoride (MgF2) transmits well into the VUV region at the hydrogen Lyman-alpha line (121nm) and beyond. Application as window, lens, in most VUV region optics and is excellent for excimer laser use.
3. Sapphire
Single crystal Sapphire possesses a unique combination of excellent optical, physical and chemical properties, the most useful is that it is the hardest of the oxide crystals. Sapphire maintains its strength even at high temperatures. It has good thermal properties, excellent electrical and dielectric properties, and is chemically resistant to common acids and alkali at temperatures up to 1000℃ as well as to HF below 300℃.
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