A Class 1 laser system:


  • Considered to be capable of producing exposure conditions during normal operation   unless the beam is viewed witA Class 1 laser system is:h an optical instrument such as an eye-loupe (diverging beam) or telescope (collimated beam), and
  • Exempt from any control measures other than to prevent potentially hazardous optically aided viewing; and is exempt from other forms of surveillance.


A Class 2 laser system:


  • Emits radiation in the visible portion of the spectrum (0.4 to 0.7μm), and
  • Eye protection is normally afforded by the aversion response


A Class 2M laser system:


  • Emits inthe visible portion of the spectrum (0.4-0.7μm) and
  • Eye protection is normally afforded by the aversion response for unaided viewing.
  • However, Class 2 M is potentially hazardous if viewed with certain optical aids.


A Class 3 laser system (medium power):


  • May be hazardous under direct and specular reflection viewing conditions, but is normally not a diffuse reflection or fire hazard.

There are two subclasses:

  • A Class 3 R laser system is potentially hazardous under some direct and specular reflection viewing conditions if the eye is appropriately focused and stable, but that probability of an actual injury is small. The laser will not post either fire hazard ordiffuse-reflection hazard.
  • A Class 3B laser system may be hazardous under direct and specular reflection viewing conditions, but is normally not a diffuse reflection or fire hazard.


A Class 4 laser system (high power):


  • Is a hazard to the eye or skin from the direct beam, and
  • May pose a diffuse reflection or fire hazard
  • May also produce laser generated air contaminants (LGAC) and hazardous plasma radiation.

Commercially produced lasers are classified according to the CDRH Federal Standard (FLPPS, 21 CFR 1040) and identified by labels affixed to the laser. Removal of protective housing or system modification can increase a laser’s classification. Contact the LSO for review prior to servicing or system modification.