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Photonics Dictionary

sapphire crystal

Sapphire crystal refers to a transparent, single-crystal form of aluminum oxide (Al2O3) known as corundum. It is one of the hardest known materials, second only to diamond on the Mohs scale of mineral hardness. Due to its exceptional hardness and scratch resistance, sapphire crystal is commonly used as a durable and protective material in various applications, particularly in optical and electronic devices.

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In the context of optics, sapphire crystal is utilized as a high-quality material for manufacturing lenses, windows, and other optical components. Its excellent optical properties, including high transparency across a broad spectrum of wavelengths, make it ideal for use in lenses and windows for cameras, lasers, and scientific instruments. Sapphire crystal is also employed as a protective cover for the camera lenses of high-end smartphones and watches due to its scratch-resistant properties.

In addition to optics, sapphire crystal finds applications in the electronics industry. It is commonly used as a substrate material for manufacturing electronic wafers and as a protective cover for the displays of electronic devices such as smartphones, smartwatches, and tablets. Sapphire's high hardness and resistance to scratches and abrasion make it an ideal material for protecting electronic displays from damage and wear.
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