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Photonics Dictionary

half-power point (HPP)

1. The value on either the leading or the trailing edge of a laser pulse at which the power is one-half of its maximum value. 2. The wavelength at which a filter is transmitting one-half of its peak transmission. For a bandpass with peak transmission of 70 percent, the wavelengths at which it transmits 35 percent would be the half-power point.
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