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8 terms
Photonics Dictionary: R
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diffraction x
R x
reconstruction diffraction efficiency
Holographic quantity expressed as the ratio of the reconstructed first-order image to that of the incident reconstructing beam.
radial distribution method
A statistical analysis of facts obtained when the intensity of x-ray diffraction is calculated at different angles. In this way, the interatomic distances of gases and liquids can be deduced, with...
Rayleigh range
In the region of a Gaussian beam focus by a diffraction-limited lens, it is the axial distance from the point of minimum beam waist (Wo) to the point where the beam diameter has increased to .
reflection grating
A reflection grating is an optical component that consists of a series of closely spaced, parallel reflecting surfaces or grooves. These grooves are typically ruled or etched onto a flat substrate or...
RHEED
reflection high-energy electron diffraction
Rowland circle
The circle that contains the slit, grating and primary astigmatic focus of a concave diffraction grating.
Rowland ghosts
In spectroscopy, the false images arranged symmetrically on both sides of the true line and caused by irregularities in the ruling of diffraction gratings.
Rowland mounting
The mounting of a concave diffraction grating and a plate holder at the ends of a rigid bar. The ends follow separate straight tracks that intersect perpendicular to each other. The slit is located...
Photonics Dictionary
R
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