The diffraction grating is the main element in the optical system of a spectrometer that separates incident polychromatic radiation (white light) into monochromatic radiation (light of one color). It consists of a series of parallel grooves, equally spaced and formed in a reflective coating deposited onto a glass substrate. The distance between each groove and the angles the grooves form with the substrate influence both the dispersion and efficiency of a grating.
What are the key parameters when choosing the right grating for your spectrometer?
All spectrometers manufactured by Sarspec are equipped with fixed diffraction gratings that can be selected by the user according to the wavelength range of interest. The two key parameters when choosing the right grating for your spectrometer are the groove density which allows you to set the operational wavelength range and optical resolution and the grating groove efficiency for the selection of the wavelength range where your system sensitivity is at its maximum. Detailed information about these two parameters can be found in the following sections.
Grating Groove Density
Which types of gratings are used in our spectrometers?
Sarspec uses regularly three types of gratings in its spectrometers depending on the purpose of the application and required specifications. A brief description of Ruled, Holographic, and Blazed Holographic grating can be found within the following sections.
Blazed Holographic Gratings
Available gratings to configure your spectrometer
UV / Vis*
UV / Vis / NIR*
Vis / NIR*
* Blazed Holographic Gratings