Laser Safety at Emory University

Researchers that conduct experiments involving the use of Class 3B and 4 devices are included in the Emory University Laser Safety Program. The program covers the services that EHSO provides including: online training, registration, risk assessments, laser eye protection evaluation, hazard signage, as well as the requirements that researchers must follow when using lasers in research activities.

The two classes of laser devices that have a potential for hazardous eye exposure are:

  1. Class 3B devices can emit hazardous levels of laser light but cannot exceed an average power of 500 mW.
  2. Class 4 devices can emit hazardous levels of laser light with an average power above 500 mW.

Additionally, many laboratories have equipment with embedded Class 3B and Class 4 devices, however the equipment is classified at a lower, safer level (Class 1, 2 or 3R). Examples include: IR spectrophotometers, laser Doppler imaging systems, microscopes with laser light sources and flow cytometers.

In these situations, the system may need to be registered depending on the intended usage of the system and laser safety training may be required for researchers. The Laser Safety Officer will work with researchers to make the final determination.

If you have any questions regarding registration, use, signage and Personal Protective Equipment required for using this equipment, please contact your Laser Safety Officer at

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