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Reference.org
Diffraction efficiency
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<p>In <a href="/facts/Optics/p0vq4S1T">optics</a>, diffraction efficiency is the performance of <a href="/facts/Diffractive/Mk80xXHT">diffractive</a> optical elements – especially <a href="/facts/Diffraction_grating/TUcyt7Do">diffraction gratings</a> – in terms of <a href="/facts/Power_(physics)/mkaEyRnn">power</a> throughput. It's a measure of how much <a href="/facts/Optical_power/jmIWyX25">optical power</a> is diffracted into a designated direction compared to the power incident onto the diffractive element of grating. </p><p>If the diffracted power is designated with P and the incident power with <i>P</i>0, the efficiency η reads η = P P 0 . {\displaystyle \eta ={\frac {P}{P_{0}}}\ .} </p>