We all know that laser diode has always been a photosensitive device that people pay attention to. Many people ask how to choose laser diode. What dimensions should I pay attention to when buying laser diodes? Let's take a look at it together.

wavelength

The wavelength determines what it does. For example, the red light of about 650nm is often used in visible light equipment such as bar code scanning, positioning and line projector; The near infrared band of 808nm or 940nm often appears in beauty, ranging and sensing; Violet or UV bands such as 405nm and 375nm are mainly used for curing, detection and sterilization.

power

The power is too low, the light is not bright enough, and the measurement is inaccurate; Too high power, easy to heat, short life, and even burn chips. For example, customers who are industrial correlation sensors usually use a few milliwatts of red light; But for optical fiber coupling or laser marking, it will cost hundreds of milliwatts or even several watts.

Packaging is the key to heat dissipation and installation.

Common packages are TO, C-Mount, FAC package, Butterfly package and so on.

Beam quality

Different applications have different requirements for facula. Such as laser ranging and positioning, which pay attention to accuracy, it is best to choose the one with small beam divergence angle and stable mode; Beauty and lighting, which require high uniformity, have to choose a model with smoother light spot distribution.

Generally speaking, the selection of laser diode should not only look at a single parameter, but also consider the use, structure, cost and life together.