We all know that each grade of laser diode is different. Today, Xiaobian will tell you what classification grades it has.

Class 1 (first-class laser)

This is the safest level, and normal use will not hurt the eyes at all.

Common places: optical fiber communication laser (sealed in equipment), laser mouse, and some closed structure laser ranging modules.

Class 1M (level 1 m)

It's similar to Class 1, except that if you add an optical amplifier (such as a telescope or a magnifying glass), it may be harmful.

Common in: multimode optical fiber system, some scanners.

Class 2 (secondary laser)

Mainly visible light (400~700 nm), power ≤ 1 mW.

Why is 1 mW still safe?

Because the human eye has a natural evasive reaction, you will subconsciously close your eyes or turn your head when you are photographed.

Class 2M (level 2 m)

It's the same as Class 2, except that it will be dangerous after being amplified with optical devices.

Common in: scanning equipment, some visible light sensors.

Class 3R (level 3 r)

Visible light or limited invisible light with power of 1~5 mW.

This grade of laser pointer has been restricted from selling in many countries because it may damage the retina.

Class 3B (level 3 b)

This level is a dangerous laser from the beginning.

Visible light: > 5 mW to 500 mW

Infrared/ultraviolet: anyone above 1 mW can enter this gear.

These are the classification standards of laser diode laser grades. I hope you will have a clear understanding after reading them.