Raman spectrum is a kind of scattering spectrum, through the laser action on the sample scattering spectrum analysis, can get molecular vibration, rotation information, so as to be applied to the study of molecular structure of an analysis method. Raman spectroscopy provides rapid, simple, repeatable and, more importantly, non-invasive qualitative and quantitative analysis without sample preparation, which can be measured directly through a fiber optic probe or through glass, quartz, and fiber optics. The Raman effect is a kind of scattering spectrum technology, so the spectrum purity, line width and stability of excited light are very high requirements.