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Barat K.,Lawrence Berkeley National Laboratory | Dennis J.E.,IET TC76
Photonics Spectra | Year: 2010

A number of laser safety standards were implemented as experts major corporations and US government agreed that control measures needed to be established in anticipation of the laser's proliferation. Researchers started determining the levels of wavelength and duration of exposure that were unable to cause injury to a person. The levels became known as maximum permissible exposures (MPEs) and were expressed in units of irradiance or radiant exposure. The researchers also had to determine the area over which the power or energy was to be averaged. This was defined by the area of a circular measuring aperture called the 'limiting aperture' in the American National Standards Institute (ANSI) standards. The experts agreed that a certain group of laser products were appropriate to enhance safety, including Class 1 and Class 2 products.

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