Diffraction efficiency
Diffraction efficiency is the performance of diffractive optical elements - especially diffraction gratings - in terms of power throughput. It's a measure of how much optical power is diffracted into a designated direction compared to the power incident onto the diffractive element.
If the diffracted power is designated with and the incident power with the efficiency readsIn the most common case - the diffraction efficiency of optical gratings - there are two possibilities to specify efficiency:
