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Diffraction efficiency : ウィキペディア英語版
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 P and the incident power with P_0 the efficiency \eta reads
:\eta = \frac \ .
== Grating efficiency ==

In the most common case – the diffraction efficiency of optical gratings (therefore also called ''grating efficiency'') – there are two possibilities to specify efficiency:
*The ''absolute efficiency'' is defined as above and relates the power diffracted into a particular order to the incident power.
*The ''relative efficiency'' relates the power diffracted into a particular order to the power that would be reflected by a mirror of the same coating as the grating, therefore attributing to inevitable reflection losses at the grating but not caused by inefficient diffraction itself.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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