In 1928, Indian physicists first discovered that after monochromatic light irradiates material molecules and interacts with them, in addition to Rayleigh scattering, there is also an inelastic dispersion called "Raman scattering". Compared with Rayleigh scattering, Raman scattering is 3 to 6 orders of magnitude smaller in intensity. This scattering is related to the structure of the material, so it can be used for material identification. Since the Raman signal is very weak and requires a strong excitation light source, the Raman effect has not been widely used for decades after its discovery. With the rapid development of laser technology, weak signal detection technology, computer applications and instrumentation itself, the application of Raman spectroscopy has achieved breakthrough progress. This experiment is composed of a 785nm multi-mode narrow linewidth laser light source, a micro spectrometer, a 785 Raman probe, a sample cell and a bracket.
