Optical Density or ( OD ) of laser safety goggles determines how well the goggles reduce the laser power over a particular wavelength range. The list below details the most typical optical densities along with the corresponding levels of attenuation. The larger the Optical Density value the greater the level of protection.
OD 1+: >10X reduction in laser power
OD 2+: >100X reduction
OD 3+: >1000X reduction
OD 4+: >10,000X reduction
OD 5+: >100,000X reduction
OD 6+: >1,000,000X reduction
OD 7+: >10,000,000X reduction
Higher OD's are preferable when the laser is not required to still be visible for alignment purposes. If you do need to be able to see the laser beam while reducing it to an eye safe level then a very precise calculation will be required.
If you have any questions feel free to call us on 1300 411 337 or contact us and one of our laser safety experts will be happy to assist.