Grating Dispersion

Diffraction gratings are used to split light into separate wavelengths, or to disperse the light. Angular dispersion is a correlation between a change in the diffraction angle and a small change in wavelength. Angular dispersion is

k

where

b = Diffracted Angle

k = Diffracted Order

n = Groove Density

 

Linear dispersion will vary with the distance from the grating to the detector. Linear dispersion is

c

where

b = Diffracted Angle

k = Diffracted Order

n = Groove Density

LB = Distance from Grating to Detector

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