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Understanding and Specifying LIDT of Laser Components

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Understanding and Specifying LIDT of Laser Components

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Laser-induced damage threshold (LIDT) is defined within ISO 21254 as the “highest quantity of laser radiation incident upon the optical component for which the extrapolated probability of damage is zero”. The purpose of LIDT is to specify the maximum laser fluence (for pulsed lasers, typically in J/cm2) or the maximum laser intensity (for continuous wave lasers, typically in W/cm2) that a laser optic can withstand before damage occurs. Because of the statistical nature of laser damage testing, LIDT cannot be considered as the fluence below which damage will never occur, but rather the fluence below which the damage probability is less than the critical risk level.

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