Experimental determination of maximum permissible exposure to laser radiation of 1.54 μ wavelength

An experimental determination was made of the maximum permissible, from the point of view of safety, exposure H_MPE of the human eye to single laser pulses of 1.54 μ wavelength. For pulses of τ = 40 nsec duration the value of this exposure, measured in terms of the energy density, was H_MPE=0.16 J/cm² and for τ = 10^–3 sec pulses it was H_MPE=0.3 J/cm².