Definition and difference of sapphire window, sapphire optical window and sapphire protection window

Sapphire window is a common name, sapphire optical window and sapphire protection window are proprietary names for different applications of sapphire

The window is a parallel plane plate, which is usually used as a protective window for electronic sensors or external environment detectors. The window does not change the magnification of the system. Substrate materials include various sapphire, optical glass, K9, ultraviolet fused silica, infrared fused silica, and calcium fluoride (CaF2), magnesium fluoride (MgF2), zinc selenide (ZnSe), germanium (Ge), silicon (Si) And other crystal materials, and provide various optical coatings such as anti-reflection coatings, high-reflection coatings, spectroscopic coatings, and metal coatings. Broadband antireflection coatings can be used in the ultraviolet, visible, near-infrared and mid-infrared bands. A window made of single crystal sapphire material is called a sapphire window.

Sapphire window is a common name, which itself includes sapphire optical window and sapphire protective window.

Sapphire optical windows refer to sapphire windows used in optical applications. This optical use generally refers to imaging, detection, scanning, and so on. Because sapphire has the ability to transmit the full spectrum from ultraviolet to near-infrared, sapphire optical windows can reduce the amount of glass used in optical instruments and greatly reduce the weight of equipment. It has a wide range of applications in aerospace and other fields. However, the transmittance of sapphire material is only between 82-85%. In order to increase the transmittance of a specific waveband or prevent the transmittance of a specific waveband, it is often necessary to carry out a specially designed coating treatment on the sapphire optical window, such as AR coating, AF film, etc., in the application of high-intensity laser, the requirements for coating are higher, and the application of high-threshold coating technology to sapphire is currently a direction under study in my country.

In order to make sapphire optical windows meet higher requirements, higher requirements are also put forward for the processing of sapphire optical windows. First of all, in order to ensure the consistency of the spectrum transmission, the parallelism of the sapphire window must be guaranteed (that is, the double-sided uniformity, to solve the optical path problem); secondly, the flatness of any plane (surface type) There are also strict requirements. The flatness is required to be within the range of nanometers, which is called wavelength optically, and it is generally required to be within 1/4 wavelength.

The sapphire protective window is a window product that uses the characteristics of sapphire's pressure resistance, scratch resistance, and high temperature resistance to protect the user or the contents of the container. Due to the extremely high hardness of sapphire, it has stronger pressure resistance and scratch resistance than other glass products. The protective window made of sapphire is often used in deep water, oil fields, flammable and explosive occasions, high-pressure containers, In vacuum containers and other fields, sapphire can withstand up to 2030 degrees Celsius, and is often used in high-temperature containers.

It can be seen from the above that the sapphire window is a common name, and the sapphire optical window and the sapphire protection window are the proprietary names for different applications of sapphire.

Taixing Hechen Crystal Technology Co., Ltd. specializes in the production of various sapphire windows. The products have been widely used in various fields and have been well received by customers.