In the precise architecture of the photoelectric system, the optical plates undertake a mission that is both simple and important: while isolating the harsh external environment, they allow specific band light signals to pass through efficiently. Sapphire plates demonstrate excellent performance under extreme high-temperature and high-pressure conditions, making them a vital component in photoelectric systems.

1. Core value dimension

The core value of sapphire plates lies in the multi-dimensional performance advantages brought by the artificial single crystal alumina of their material nature. This is not a breakthrough in the limit of a single performance, but rather a systematic balance and leadership in the four dimensions of optics, mechanics, thermology and chemistry.

(1) Wide-spectrum optical window

The wide transmission spectrum of sapphire covers multiple wavelengths, including ultraviolet, visible light, near-infrared and mid-infrared. This characteristic gives sapphire plates “multispectral” capabilities. That means they can transmit ultraviolet, visible and infrared spectra and meet the requirements of multi-wavelength composite photoelectric systems.

(2) Impregnable mechanical barrier

Sapphire is a mineral that is known for its high hardness and durability, with a Mohs hardness of 9, meaning that sapphire windows are highly resistant to scratches and wear. Sapphire windows are able to withstand high pressure due to the strength of the covalent bonds within the crystal structure. This makes them significantly more robust than windows made of dielectric materials. Furthermore, sapphire windows can be manufactured into thinner plates without breaking easily.

(3) High-temperature thermal stability

In high-temperature environments, most optical materials are at risk of softening, deforming or even melting, while sapphire exhibits high thermal stability. The upper limit of the working temperature of sapphire is as high as 1600°C, and its melting point even reaches 2030-2050°C. Compared with other optical materials, the high thermal conductivity of sapphire plates gives them a distinct advantage in high-temperature resistance, enabling them to operate continuously at high temperatures without being affected.

(4) Chemical inertness and environmental tolerance

Sapphire plates are characterized by their high level of chemical inertness, making them resistant to common acids and alkalis. This makes them well suited to use in corrosive environments, such as coastal settings, chemical reaction vessels and the pharmaceutical industry. Sapphire is the ideal solution for applications where durability in corrosive environments is paramount.

2. Typical optoelectronic application scenarios

(1) The field of consumer electronics

The application of sapphire plates in the consumer electronics field is well-known to the public. For instance, the camera covers of smartphones are made of sapphire material to protect the precision lenses from scratches and wear, ensuring that the images are always clear and sharp. The crystal of smartwatches also extensively uses sapphire, effectively resisting scratches and erosion during daily use and keeping the display screen transparent for a long time.

(2) The field of industrial manufacturing

In the field of industrial manufacturing, sapphire plates play a vital role as protective barriers in laser processing systems. Sapphire plates are highly durable, preventing surface damage, deforming at high temperatures and scratching easily. The following are some typical applications: laser drilling windows, laser welding windows and plasma cavity windows. Furthermore, in scenarios where real-time observation of high-temperature internal working conditions is required, such as in the observation windows of furnaces, reactors and combustion chambers, sapphire windows offer a reliable solution thanks to their high-temperature resistance.

(3) The field of aerospace and deep sea

Sapphire plates present a number of challenges in the field of aerospace. Sapphire plates boast outstanding mechanical properties, chemical stability and high-temperature resistance, making them well-suited to meeting these demanding requirements. Sapphire windows have been shown to demonstrate exceptional performance in marine environments. Due to its excellent resistance to pressure and corrosion, it is able to capture high-definition images of targets in the deep sea whilst maintaining consistent performance over extended periods of time.

(4) Scientific research and the medical field

In the field of scientific research, sapphire plates are frequently utilized as observation windows for a variety of photometers, spectrometers and vacuum systems. Sapphire windows are an ideal solution for semiconductor equipment and vacuum coating machines, offering both optical detection signals and a reliable high vacuum seal. In the medical field, sapphire windows are an ideal choice for endoscope and chemical container windows due to their chemical inertness and biocompatibility.