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
Pixel Size µm CCD width/mm Select Excitation Laser
Linewidth, pixels Laser wavelength (nm)
Focal Length mm Aperture ratio
Slit width Dispersion nm/mm
Dispersion nm/pixel Grating rotation (°)
Grating Center(cm-1) Slit width µm:
Range (nm) Range (cm-1)
Grooves/mm Spacing/nm Short Wavelength (nm) Long Wavelength (nm)
Grating size/mm Next resolv. wavelength Next resolved wavenumber
Low Raman shift (cm-1) High Raman shift (cm-1)
nm to eV CCD Resolution (nm) Resolution (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.