Beginner information on Raman scattering measurements
Information on Raman scattering and Horiba Raman spectrometers
To understand instrumentation, you should understand the following terms:
monochromator
diffraction grating
spectral resolution
CCD detector
half-wave plate
gas laser
These you can google, or there is also a nice resource on the optical parts on the site of a Newport, a company which produces various optical parts.