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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 reads : == 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）』 ■ウィキペディアで「diffraction efficiency」の詳細全文を読む スポンサード リンク
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