Diffraction Grating Calculator

Your details

Choose which quantity to calculate; the others become inputs.
Wavelength of the incident light in nanometres. Visible light is 380-700 nm.
nm
Number of slits (grooves) per millimetre on the grating.
lines/mm
Angle between the incident beam and the grating normal. 0 = normal incidence.
deg
Integer diffraction order: 1 = first order, 2 = second order, etc.
Diffraction angle (theta)
19.269deg

Angle between the diffracted beam and the grating normal

Grating spacing (d)1.6667micrometers
Wavelength550nm
Line density (N)600lines/mm
Maximum diffraction order3
Angular dispersion (dtheta/dlambda)0.0364deg/nm
Order 119.27deg
Order 241.3deg
Order 381.89deg
Order 119.27
Order 241.3
Order 381.89
Order 4-
Order 5-

Diffraction angle: 19.269 degrees.

  • The diffracted beam exits at 19.269 degrees from the grating normal.
  • Angular dispersion is 0.0364 deg/nm, meaning each nanometre of wavelength separates by that angle.
  • At most 3 diffraction orders can exist for this wavelength and grating.

Next stepSwitch the solve mode to Resolving Power to check spectral resolution, or to Maximum Order to see how many orders this grating supports.

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