Laser hazard signs must be conspicuously posted to warn onlookers of the potential hazard. The appropriate warning or danger sign shall be posted at the entryway(s) and, if deemed necessary by the LSO, should also be posted within the laser-controlled area.
For Class 3B and Class 4 signs, ensure the signs include:
- type of laser(s),
- wavelength(s) used,
- and power output used.
- Minimum OD for the laser wavelengths is listed on your laser use authorization (LUA) document.