Nanjing Co-Energy Optical Crystal Co Ltd
First, you need to know that sapphire windows are accessible in a number of diverse grades, or it is available in different quality levels, which is designed specifically to meet the needs of a certain application. Understand it like this, the top most grades can be used for the highly demanding optical applications, while lower grades are appropriate for structural or mechanical applications.
The optical properties of both natural and synthetic sapphire have the same crystalline structure and each crystal has three axes – a, b & c. Here, when light is transmitted along c-axis utmost desirable optical properties can be achieved. Since it is a solo crystal, not any of the sapphire can be molded, drawn or cast. But synthetic sapphire, on the other hand, can be "developed" into specific shapes to meet the requirements of distinct applications. Sapphire window has transmission range from UV to Mid-IR (0.15-5.5µm). Scratches can look worse than they really are and sapphire can be polished even the extreme ones. Optical window is flat optically and mechanically. Optically transparent plates that are usually designed to maximize transmission in a specified wavelength range, while minimizing reflection and absorption. They are often used to protect optical systems and electronic sensors from an outside environment. Silicon windows are ideal for IR applications and are popular for the 1.2 - 7μm spectral regions due to their low cost and low density. Features Ideal for IR Applications in the 1.2 - 7 µm Spectral Range Available Uncoated or anti-reflection coating for <2% Average Reflectance from 3 - 5 µm Perfect for weight sensitive applications
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Cissy Zhu
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January 2020
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