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Understanding Laser Classes

  • joévan ZIEBEL
  • Jul 25
  • 3 min read

Lasers have become increasingly important in various fields, but their use requires special attention to safety. Laser classes determine the level of danger based on their power and risks to skin and eyes. There are several classes, ranging from class 1 (the safest) to class 4 (the most dangerous) .

In this article, we will introduce you to the main things you need to know about laser safety.


We'll look at laser classes, which determine a laser's level of danger based on its power and how it's used. We'll also discuss safety measures to prevent accidents and protect those working with lasers.

laser-classes-identification

Understanding Laser Classes:

Lasers are classified according to their hazard level, ranging from Class 1 to Class 4. The higher the class number, the more hazardous the laser is to human health and materials. Here's an overview of the different laser classes:

  • Class 1: These are lasers considered harmless to eyes and skin under normal operating conditions. They are either low-power or covered with a shield that blocks access to the laser. They are often used as a class of laser machines or in the case of a CD player.

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  • Class 2: Class 2 lasers pose little risk to the eyes. They do not pose a risk of burning the skin, but can cause permanent damage if you look directly into the beam for more than 0.25 seconds. More precisely, it is a visible laser (400 - 700 nm) with a power < 1 mW. As long as the interaction time with the eye is < 0.25 seconds (i.e. the instinctive eyelid closure reflex), Class 2 lasers are safe.

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  • Class 3R: Class 3R lasers can be hazardous to the eyes if used with direct vision into the beam. This class is more dangerous than Class 2, but the risk remains low. Safety glasses are mandatory, and users must be trained in laser safety.


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  • Class 3B: Class 3B lasers are dangerous to the eye in direct fire and specular reflection (on a mirror) and can cause irreversible damage. Wearing safety glasses is mandatory and users must be trained in laser safety.

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  • Class 4: Class 4 lasers are extremely dangerous to eyes and skin, regardless of the type of reflection (even off a wall). They can cause serious burns, irreversible damage, and even fires. Wearing goggles and gloves is mandatory, and those using them must be trained in laser safety.


class-4-label


Safety measures to be implemented:

It is essential to take appropriate safety precautions when using lasers, regardless of their class level. Here are some safety measures to implement:

  • Train laser operators: All laser operators must receive adequate training in laser use and safety.

  • Use personal protective equipment (PPE): PPE should be used to protect the eyes, skin

  • Establish control zones: Areas where hazardous lasers are used (class > 2M) must be clearly defined and identified to prevent access by unauthorized persons.

  • Establish safety procedures: Safety procedures must be established and consistently enforced to ensure the safety of personnel working with lasers. Safety procedures should include guidelines for normal operations, emergency situations, and equipment maintenance procedures. Additionally, safety procedures must be reviewed and updated regularly to remain relevant and ensure optimal safety.


In conclusion, lasers are very useful tools in a variety of industries, but they can also be dangerous if not used correctly. Therefore, it is essential to undergo laser safety training to ensure that every precaution is taken to protect workers and members of the public.


Laser safety training will help users understand potential hazards and implement the necessary safety measures to prevent accidents. Additionally, establishing safety procedures and keeping them up-to-date will help ensure safe and effective laser use. You can download the laser class guide below so you always have a handy reminder.


 
 
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