Sapphire windows with diameters from several millimeters to several hundreds of millimeters are applied in various devices that work on the ground, under water, and in outer space in a wide range of pressures and temperatures – from cryogenic to high temperatures. An example design of a sealed-in window is presented in Fig. 1.31 . It is meant for use at temperatures starting from cryogenic and up to 720 К, with high pressures both internal and external.
Sapphire could be used as windows: 1.mobile phone screens; 2. lens; 3. fingerprint recognition; 4. Wearable equipment windows and so on, because of its unique advantages including: high sensitivity, scratch resistance, abrasion resistance, high temperature resistance, high pressure resistance, good chemical stability, and corrosion and deliquescence resistance.
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