Diffraction efficiency

Short description: Fraction of optical power diffracted by an optical element

In optics, 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 of grating.

If the diffracted power is designated with P and the incident power with P0, the efficiency η reads η=PP0 .

## 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:[1][2]

* 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.

## References

1. ↑ "Diffraction Efficiency & Relationship between Diffraction Efficiency and Polarization". Shimadzu Corporation. 2012. http://www.shimadzu.com/products/opt/oh80jt0000001v0w.html. Retrieved 1 November 2012.
2. ↑ "Technical Note 10 - Guidelines for specifying diffraction gratings". Newport Corporation. http://gratings.newport.com/library/technotes/technote10.asp. Retrieved 1 November 2012.

## External links

* Christopher Palmer (2020). "Efficiency Characteristics of Diffraction Gratings". Diffraction Grating Handbook (8th edition). MKS Newport. https://www.gratinglab.com/Information/Handbook/Handbook.aspx. Retrieved 13 March 2020.

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