Diffraction grating

Spectrum scientific offers a wide range of diffracation gratings. A diffraction grating is an optical element that diffracts energy into its constituent wavelengths. The groove density, depth and profile of a diffraction grating dictate the spectral range, efficiency, resolution and performance of the diffraction grating, a band of equidistant, parallel lines, usually more than 5000 per inch, ruled on a glass or polished metal surface fordiffracting light to produce optical spectra.

The fundamental principle is that different wavelengths diffract to different extents, so they can be separated much as a prism separates a composite polychromatic incident light beam into its constituent wavelengths of light. Human beings see this as the separation of white light into a rainbow of colored light.


λn = dSinθn


n = order of grating

d = distance between two fringes or spectra

λ = wavelength of light

θ = angle to maxima