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This website publishes administrative rules on their effective dates, as designated by the adopting state agencies, colleges, and universities.

Rule 4123:1-5-27 | Lasers.


(A) Labeling of laser equipment.

The employer will furnish equipment provided with labels containing the following minimum information for continuous-wave (CW) lasers:

(1) Wavelength or wavelength range;

(2) Emergent beam size;

(3) Beam divergence;

(4) Maximum average power output;

(5) Maximum emergency beam irradiance;

(6) Manufacturer's name and address;

(7) Product identification number.

(B) Posting.

The employer will post notices in prominent locations in which lasers are being operated. (For examples see appendix to this rule.)

(C) Beam shutters or caps will be utilized, or the laser turned off, when laser transmission is not actually necessary. 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 will be turned off.

(D) Atmospheric conditions.

The employer will require the employee to keep away from the source, range, and target of the laser when there is exposure to rain or snow or when there is dust or fog in the air.

(E) Laser protection.

(1) Employees whose occupation or assignment includes exposure to laser beams will be furnished suitable laser safety goggles which will protect for the specific wavelength of the laser and be of optical density (O.D.) adequate for the energy involved. The table below lists the maximum power or energy density for which adequate protection is afforded by glasses of optical densities from five through eight.

Intensity, CW maximum power density (watts/cm2)Attenuation
Optical density(O.D.) Attenuationfactor
1025 105
1016 106
1.0 7 107
10.0 8 108

Output levels falling between lines in this table will utilize the higher optical density.

(2) Label of eye protection.

(a) Output levels falling between lines in this table will use the higher optical density.

(b) All protective goggles will bear a label identifying the following data:

(i) The laser wavelengths for which use is intended;

(ii) The optical density of those wavelengths;

(iii) The visible light transmission.

View Appendix

Last updated February 1, 2024 at 8:51 AM

Supplemental Information

Authorized By: 4121.12, 4121.121, 4121.13
Amplifies: 4121.47
Five Year Review Date: 11/1/2026
Prior Effective Dates: 1/1/1986, 4/10/2011, 6/1/2016, 9/1/2023