We all know that the price of near-infrared laser diodes has always been relatively expensive, and many people do not consider it. Take the 940nm laser diode as an example. Do you know where it is used more? Let's take a look at it together.

The band of 940nm is actually a "middle zone" between visible red light (such as 650nm) and typical infrared light (such as 1064nm). It has a particularly practical feature that it can penetrate some materials without overheating as easily as high-power infrared, which makes it a "universal band" in many sub-industries.

The most typical is the infrared lighting and camera system.

Like surveillance cameras, security systems and night vision equipment, 940nm laser diodes are used a lot.

Many people may notice that when some cameras shoot faces at night, the lights will not be as red as 850nm, which is the credit of 940nm. It belongs to "completely invisible light", and it is clear, but it is insensitive to human eyes, dazzling and not disturbing.

It also often appears in consumer electronics.

For example, face recognition, gesture recognition and distance sensors of mobile phones.

The small black dot on the top of many mobile phones is actually a 940nm laser diode working, which realizes accurate ranging through infrared structured light or TOF (time of flight) technology.

It is also widely used in the field of industrial detection and ranging.

940nm laser diode is often used in displacement sensor, laser rangefinder and autofocus module.

In industrial inspection, it can provide a stable light source, cooperate with detectors, measure the change of surface height and thickness, or judge the position of objects.

Although 940nm is not as mainstream as 1310nm or 1550nm, it still has some applications in short-distance optical communication and data transmission modules. Especially in some special occasions, such as the internal optical link of industrial automation equipment, 940nm module is favored by many engineers because of its low cost and fast response.

The application of 940nm laser diode is no longer limited to professional equipment, but has begun to be laid out in many unknown industries.