Grating Dispersion Calculator


The grating curves show typical relative efficiency for the various blaze wavelengths and should be used as a comparison guide only.
Detector Center Wavelength (nm)
Hor.pixel Vert. pixels Order
Pixel Size µm CCD width/mm Excitation LaserSelect Excitation Laser

Linewidth, pixels

Laser wavelength (nm)

Dispersion nm/mm

Focal Length(mm) Aperture ratio

Dispersion nm/pixel

Slit width

CCD Resolution (nm)

    Center Wavenumber (cm-1)

Slit width µm:

Select Grating

Next resolved wavelength

Grating rotation (°)
Grooves/mm Spacing/nm

Next resolved wavenumber

Resolution cm-1

Grating size/mm

Short Wavelength (nm)

CCD coverage

 Long Wavelength (nm)

nm to eV

Low Raman shift (cm-1)

High Raman shift (cm-1)

For Richardson Gratings not listed go to

Default slit width: 20 µm

Spectral Coverage: approximate, use for reference purpose only

Use 68 x 84mm Grating: When operating at high wavelengths (high grating angles).
The 68 x 84 mm grating preserves the light collecting power (aperture Ratio)

Central Wavelength to High: Refers to the mechanical rotation capability (not the operating or optimum range) of a grating drive. Lower the central wavelength or select a grating that allows operation over your required wavelength region.

CCD Resolution (FWHM): Refers to the resolution available with the selected detector or image intensifier.

Calculated as a typical FWHM = 2.5 pixels used as reference, actual values may vary.