I What optical filter to use for Raman spectroscopy?

Raman spectroscopy involves
Illuminating a target with a laser
Beam. This produces Raleigh scattering. Does The releigh scattering have the same frequency as the laser beam? So use an optical filter to block the same frequency as the laser?
 
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What you want to see in Raman scattering is inelastic scattering, where the frequency/wave length of the scattered light is different from the illuminating laser. On top of that signal you get a lot of elastic scattering "background" that you have to filter out. The usual way to do that is to use a diffraction grating. You can add a filter to further suppress the illuminating wavelength. The filter has to be tuned to that wavelength

 

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