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how-to-select-a-laser-protective-eyewear-1

  • The optical density (O.D.) of a filter is a measure of the light transmitted through the filter. O.D. is defined as the negative log of the filter transmission (O.D. = -log10 (transmitted power/incident power)); thus an O.D. of 4 indicates that 0.01% of the incident light in the stop band of the filter will be transmitted through the filter and that 99.99% will be stopped by the filter. 
     
    To determine the required optical density for laser safety glasses for the safe operation of a laser, use the output power of the laser and the maximum permissible exposure (MPE), or exposure limit, to radiation under the laser’s operating conditions. The required O.D. for safety glasses is given by: O.D. = log10 (laser output/exposure limit) (*note that the laser output and exposure limit must have the same units)
     
    Always inspect glasses for damage before wearing them. Also keep in mind that glasses can themselves be damaged by the laser exposure and lose some of their protective capacity if the power of the laser is above their damage threshold.
     
    Another thing to be aware of when selecting laser protective eyewear is how the transmission of the goggle will affect your ambient light vision. It is possible for the goggle to block your ability to read instruments or see controls on your apparatus. An example would be a goggle that blocks visible red light used for a HeNe laser or the KLS short-pulse beam. This would keep you from seeing red LED’s. A situation like this requires the user to develop the discipline not to remove his protective glasses to read the instrument. In cases where it is impossible to do an experiment because the laser goggles interfere too much with vision, remote monitoring of the experiment can be arranged using video cameras and monitors.
     


    So, keep it safe and be wise with our Laser Safety Glasses