29 CFR 1926.54 - Nonionizing radiation.
(c) Employees, when working in areas in which a potential exposure to direct or reflected laser light greater than 0.005 watts (5 milliwatts) exists, shall be provided with antilaser eye protection devices as specified in subpart E of this part.
(e) Beam shutters or caps shall be utilized, or the laser turned off, when laser transmission is not actually required. When the laser is left unattended for a substantial period of time, such as during lunch hour, overnight, or at change of shifts, the laser shall be turned off.
(g) The laser beam shall not be directed at employees.
(h) When it is raining or snowing, or when there is dust or fog in the air, the operation of laser systems shall be prohibited where practicable; in any event, employees shall be kept out of range of the area of source and target during such weather conditions.
(1) Direct staring: 1 micro-watt per square centimeter;
(2) Incidental observing: 1 milliwatt per square centimeter;
(3) Diffused reflected light: 2 1/2 watts per square centimeter.
(k) Laser unit in operation should be set up above the heads of the employees, when possible.