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I was wondering how you can calculate the intensity of light produced by diffraction orders. If say a laser was incident on a diffraction grating and this split the zeroth and +-1 orders what percentage of the light intensity is within the zero and first orders and how can you work this out? I'm only looking for a rough percentage figure i don't actually need to calculate exact figures, i imagine that is possible if details of the grating/laser were known..

Many thanks