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.pixels Vert. pixels Order 
Pixel Size µm CCD width/mm Excitation LaserSelect Excitation Laser

Linewidth, pixels

Laser wavelength (nm)
Focal Length(mm) Aperture ratio


Slit width

Dispersion nm/mm
    Dispersion nm/pixel  

Grating rotation (°)

FERGIE Grating Center(cm-1) Slit width µm:
Select Grating

Range (nm)

  Range (cm-1)
Grooves/mm Spacing/nm

CCD Resolution (nm)


Resolution cm-1

Grating size/mm

Next resolved wavelength  

Next resolved wavenumber


Short Wavelength (nm)


Long Wavelength (nm)

nm to eV

Low Raman shift (cm-1)


High Raman shift (cm-1)

For Richardson Gratings not listed go to

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)

Center 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.