What are the advantages of NIR Raman?

Visible lasers provide a simple and convenient Raman analysis of many materials - but not all.

There are competing processes that occur along with Raman scattering, one of the most prominent is fluorescence.

In the fluorescence process enough energy from the laser photon is available with which to promote an electronic transition and hence a fluorescence emission. Since the Fluorescence signal is far stronger than that produced from Raman scattering, the fluorescence may obscure the Raman spectrum altogether.

Thus, one way to avoid or minimize fluorescence is to use laser wavelengths with a lower energy photon. (Blue/Green light is higher in energy than red light, which is higher in energy than NIR wavelengths).

The NIR laser provides a useful wavelength with which to reduce fluorescence.