| Definition: | time difference between the end time, te, and the start time, ts, of an optical radiation exposure Note 1 to entry: For a single pulse, the exposure duration is the duration between the half-peak power point of the leading edge and the corresponding point on the trailing edge. For a train of pulses (or subsections of a train of pulses), the exposure duration is the duration between the first half-peak power point of the leading pulse and the last half-peak power point of the trailing pulse. Note 2 to entry: The exposure duration is expressed in seconds (s).
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